Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
First Measurement of the Analyzing Power inpd rarr (pp)n with a Fast Forward 1S0 Diproton
Analysing power in deuteron breakup
G Macharashvili 2004
First Measurement of the Analyzing Power in pd rarr (pp)n with a Fast Forward 1S0 Diproton
SYaschenko12 SDymov2 VKomarov2 GMacharashvili23 FRathmann4 SBarsov5 MHartmann4 VHejny4 RGebel4 AKacharava13
AKhoukaz6 PKulessa47 AKulikov2 VKurbatov2 NLang6 ILehmann4 BLorentz4 TMersmann6 SMerzliakov2 SMikirtytchiants5
AMussgiller4 MNioradze3 HOhm4 DPrasuhn4 RSchleichert4 HSeyfarth4 ESteffens1 HJStein4 HStroumlher4 YuUzikov28
BZalikhanov2 and NZhuravlev2
1 PI II Uni Erlangen-Nurnberg Germany 2 JINR Dubna Russia 3 HEPhI TSU Tbilisi Georgia 4 IKP FZ-Julich Julich Germany
5 PNPI Gatchina Russia 6 IKP Uni Munster Germany 7 INPh Krakow Poland 8 KNU Almaty Kazakhstan
Analysing power in deuteron breakup
G Macharashvili 2004
Physics motivation
Study of pd dynamics at high momentum transfer Short-range structure of NN interactions
1So ndashstate of the fast forward diproton provides new features absent in the pdrarrdp and exclusive deuteron disintegration
Insight on few nucleon systems at short distances
Different ∆ contribution at 05 and 08 GeV ∆ contribution suppressed by the isospin factor 3 times at 08 GeV
A number of theoretical models proposedLKondratyuk et al Phys Lett B 100 448 (1981)Yu Uzikov Phys Part Nucl 29 (1998) 583LPKaptari et al Eur Phys J A19 301 (2004) hellip
Analysing power in deuteron breakup
G Macharashvili 2004
Range telescopeswith TOF-Stop ∆E
Cluster-jet
Target
D1
D2
D3
TOF-start
MWPC 12
1 m
1 23
COSYbeam
NIM A 462 364 (2001)
Side walldetectors
Forwarddetectors
Backwarddetectors
Negative particledetectors
NIM A 481 378 (2002)
ANKE spectrometer
ANKE spectrometer
Analysing power in deuteron breakup
G Macharashvili 2004
Polarizaed proton beamstored in COSY ring 3 109
polarization 0564 plusmn 0003stat plusmn 0004syst
D2 cluster targetdensity 21014 cm-2
along the beam 12 mmfull width 45 mm
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
First Measurement of the Analyzing Power inpd rarr (pp)n with a Fast Forward 1S0 Diproton
Analysing power in deuteron breakup
G Macharashvili 2004
First Measurement of the Analyzing Power in pd rarr (pp)n with a Fast Forward 1S0 Diproton
SYaschenko12 SDymov2 VKomarov2 GMacharashvili23 FRathmann4 SBarsov5 MHartmann4 VHejny4 RGebel4 AKacharava13
AKhoukaz6 PKulessa47 AKulikov2 VKurbatov2 NLang6 ILehmann4 BLorentz4 TMersmann6 SMerzliakov2 SMikirtytchiants5
AMussgiller4 MNioradze3 HOhm4 DPrasuhn4 RSchleichert4 HSeyfarth4 ESteffens1 HJStein4 HStroumlher4 YuUzikov28
BZalikhanov2 and NZhuravlev2
1 PI II Uni Erlangen-Nurnberg Germany 2 JINR Dubna Russia 3 HEPhI TSU Tbilisi Georgia 4 IKP FZ-Julich Julich Germany
5 PNPI Gatchina Russia 6 IKP Uni Munster Germany 7 INPh Krakow Poland 8 KNU Almaty Kazakhstan
Analysing power in deuteron breakup
G Macharashvili 2004
Physics motivation
Study of pd dynamics at high momentum transfer Short-range structure of NN interactions
1So ndashstate of the fast forward diproton provides new features absent in the pdrarrdp and exclusive deuteron disintegration
Insight on few nucleon systems at short distances
Different ∆ contribution at 05 and 08 GeV ∆ contribution suppressed by the isospin factor 3 times at 08 GeV
A number of theoretical models proposedLKondratyuk et al Phys Lett B 100 448 (1981)Yu Uzikov Phys Part Nucl 29 (1998) 583LPKaptari et al Eur Phys J A19 301 (2004) hellip
Analysing power in deuteron breakup
G Macharashvili 2004
Range telescopeswith TOF-Stop ∆E
Cluster-jet
Target
D1
D2
D3
TOF-start
MWPC 12
1 m
1 23
COSYbeam
NIM A 462 364 (2001)
Side walldetectors
Forwarddetectors
Backwarddetectors
Negative particledetectors
NIM A 481 378 (2002)
ANKE spectrometer
ANKE spectrometer
Analysing power in deuteron breakup
G Macharashvili 2004
Polarizaed proton beamstored in COSY ring 3 109
polarization 0564 plusmn 0003stat plusmn 0004syst
D2 cluster targetdensity 21014 cm-2
along the beam 12 mmfull width 45 mm
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
First Measurement of the Analyzing Power in pd rarr (pp)n with a Fast Forward 1S0 Diproton
SYaschenko12 SDymov2 VKomarov2 GMacharashvili23 FRathmann4 SBarsov5 MHartmann4 VHejny4 RGebel4 AKacharava13
AKhoukaz6 PKulessa47 AKulikov2 VKurbatov2 NLang6 ILehmann4 BLorentz4 TMersmann6 SMerzliakov2 SMikirtytchiants5
AMussgiller4 MNioradze3 HOhm4 DPrasuhn4 RSchleichert4 HSeyfarth4 ESteffens1 HJStein4 HStroumlher4 YuUzikov28
BZalikhanov2 and NZhuravlev2
1 PI II Uni Erlangen-Nurnberg Germany 2 JINR Dubna Russia 3 HEPhI TSU Tbilisi Georgia 4 IKP FZ-Julich Julich Germany
5 PNPI Gatchina Russia 6 IKP Uni Munster Germany 7 INPh Krakow Poland 8 KNU Almaty Kazakhstan
Analysing power in deuteron breakup
G Macharashvili 2004
Physics motivation
Study of pd dynamics at high momentum transfer Short-range structure of NN interactions
1So ndashstate of the fast forward diproton provides new features absent in the pdrarrdp and exclusive deuteron disintegration
Insight on few nucleon systems at short distances
Different ∆ contribution at 05 and 08 GeV ∆ contribution suppressed by the isospin factor 3 times at 08 GeV
A number of theoretical models proposedLKondratyuk et al Phys Lett B 100 448 (1981)Yu Uzikov Phys Part Nucl 29 (1998) 583LPKaptari et al Eur Phys J A19 301 (2004) hellip
Analysing power in deuteron breakup
G Macharashvili 2004
Range telescopeswith TOF-Stop ∆E
Cluster-jet
Target
D1
D2
D3
TOF-start
MWPC 12
1 m
1 23
COSYbeam
NIM A 462 364 (2001)
Side walldetectors
Forwarddetectors
Backwarddetectors
Negative particledetectors
NIM A 481 378 (2002)
ANKE spectrometer
ANKE spectrometer
Analysing power in deuteron breakup
G Macharashvili 2004
Polarizaed proton beamstored in COSY ring 3 109
polarization 0564 plusmn 0003stat plusmn 0004syst
D2 cluster targetdensity 21014 cm-2
along the beam 12 mmfull width 45 mm
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Physics motivation
Study of pd dynamics at high momentum transfer Short-range structure of NN interactions
1So ndashstate of the fast forward diproton provides new features absent in the pdrarrdp and exclusive deuteron disintegration
Insight on few nucleon systems at short distances
Different ∆ contribution at 05 and 08 GeV ∆ contribution suppressed by the isospin factor 3 times at 08 GeV
A number of theoretical models proposedLKondratyuk et al Phys Lett B 100 448 (1981)Yu Uzikov Phys Part Nucl 29 (1998) 583LPKaptari et al Eur Phys J A19 301 (2004) hellip
Analysing power in deuteron breakup
G Macharashvili 2004
Range telescopeswith TOF-Stop ∆E
Cluster-jet
Target
D1
D2
D3
TOF-start
MWPC 12
1 m
1 23
COSYbeam
NIM A 462 364 (2001)
Side walldetectors
Forwarddetectors
Backwarddetectors
Negative particledetectors
NIM A 481 378 (2002)
ANKE spectrometer
ANKE spectrometer
Analysing power in deuteron breakup
G Macharashvili 2004
Polarizaed proton beamstored in COSY ring 3 109
polarization 0564 plusmn 0003stat plusmn 0004syst
D2 cluster targetdensity 21014 cm-2
along the beam 12 mmfull width 45 mm
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Range telescopeswith TOF-Stop ∆E
Cluster-jet
Target
D1
D2
D3
TOF-start
MWPC 12
1 m
1 23
COSYbeam
NIM A 462 364 (2001)
Side walldetectors
Forwarddetectors
Backwarddetectors
Negative particledetectors
NIM A 481 378 (2002)
ANKE spectrometer
ANKE spectrometer
Analysing power in deuteron breakup
G Macharashvili 2004
Polarizaed proton beamstored in COSY ring 3 109
polarization 0564 plusmn 0003stat plusmn 0004syst
D2 cluster targetdensity 21014 cm-2
along the beam 12 mmfull width 45 mm
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Polarizaed proton beamstored in COSY ring 3 109
polarization 0564 plusmn 0003stat plusmn 0004syst
D2 cluster targetdensity 21014 cm-2
along the beam 12 mmfull width 45 mm
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Forward detector acceptance
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Spectator detector (SDT) Energy resolution 300 keV
Momentum [GeVc]1 12 14 16 18 2
Momentum [GeVc]1 12 14 16 18 2
Num
ber o
f eve
nts
1
10
210
310
Proton momentum in FD for detected in SDT deuteronsNo background hellip
These elastic events were used for beam polarimetry
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Polarization export
-Spin flip occures at 6318 MeV(the 2nd improper resonanse)
-depolarization caused bymagnetic field errorsmisalignment of magnetsvertical focussing magnets
-Polarization loss is less than 1
ALehrach et al Spin-2002 p153
No loss of the beam polarization during the polarization export
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Beam polarimetry at 08 GeV
Analysing power in pd elastic scattering is used for the beam polarization measurement in the 1st and the 3rd flattops The Polarization value is exported to the 2nd flattop at 05 GeV
Exp data fromFIrom et al PhysRevC 28 2380 (1983)
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Analysis procedure
minus Double-track events are filtered for proton-pair selection
minus The efficiency of double-proton identification is checked by ∆E and TOF difference methods
minus Two proton phase space was checked
minus LeftRight scattered events were accumulated
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle momentum correlation
Break-up events are concentrated at the outer arc center
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Two particle TOF differences(measured versus calculated)
For the calculation two-protonhypothesis was used
(pp) ndash on the diagonal(dππππ++++) (dp) (pππππ++++) (tππππ++++) identified
TOF measurement uncertainty(the diagonal profile RMS)200 ps at 05 GeV180 ps at 08 GeV
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Missing-mass spectra
Proton-pair selection criteriaEpplt 3 MeVcosϕϕϕϕ gt 07gt 07gt 07gt 07||||YYYYtargettargettargettarget| lt 22 cm| lt 22 cm| lt 22 cm| lt 22 cm
Background in plusmn3σσσσσσσσ interval05 GeV 5 08 GeV 13
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Ay calculation and statistical uncertainties
Leftright counts of the break-up events were accumulated in each θbin
L(θ) ~ X+ (1 + Ay (θ) P+ ltcosφgt)R(θ) ~ Xminus (1 minus Ay (θ) Pminus ltcosφgt)
Measured asymmetryε(θ) = ( L(θ) minus f R(θ) ) (L(θ) + f R(θ) )
Where f is the relative luminosity correction factor f = X+Xminus
Statistical uncertaintyδε = (L + fR)-1 [(1 ndash ε2)L + (1 + ε2)(f2R + δf
2R2)]frac12
Finally the analysing power is defined asAy(θ) = ε(θ) P ltcosφgtθ P = 05 (P+ + Pminus)
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Systematic uncertainties
Difference of the beam polarizationP = 05 (P+ + Pminus)
∆P = 05 (P+ minus Pminus)leads to the change of analysing powerAy rarr Arsquoy = Ay (1 + ∆PmiddotAy)-1
Relative luminosity correction factor f = L +L -if frarrfrsquo = f (1 + ξ)Ay rarr Arsquoy lt Ay ndash ξ2P
Systematic uncertainties are negligible in comparisonwith statistical ones (le 002)
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Realtive luminosity monitoring
For relative luminosity monitoring the polarizationindependent count rates used
Single protons counted at polar angles close to zero θcm lt 1o
Single protons counted at azimuthal angles85o lt φ lt 95o or 265o lt φ lt 275o
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
θ
θ
ppcm
ncm
p
p
1
2
p1
p2
θ kcm
(pp)
(pp)
p
nd
center-of-mass frame proton-pair rest frame
Selected event cosθkkkkcmcmcmcm distributions
S ndash wave dominance
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
S ndash wave dominance
Excitation energy spectra
Events accepted ifEpp lt 3 MeV and cosϕϕϕϕ gt 07gt 07gt 07gt 07
Epp uncertainty (RMS)
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
Angular dependence of the analysing power Ay asa function of back-scattered neutron cm angle
About 2800 and 2200 break-up events were collected at 05 and 08 GeV respectively
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
Analysing power in deuteron breakup
G Macharashvili 2004
SummaryThe analysing power in the deuteron break-up was measured at two beam energies of 05 and 08 GeVat proton-pair sacttering angles 0o lt θcm lt 14o
The model accounting ONE SS and ∆ excitationdescribes well the unpolarized break-up cross section[VKomarov et al PhysLett B 553 179 (2003)]
The model fails to reproduce large Ay at 05 GeV
New approach is required
Analysing power in deuteron breakup
G Macharashvili 2004
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