Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K....
-
date post
21-Dec-2015 -
Category
Documents
-
view
216 -
download
2
Transcript of Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K....
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 1
Diffraction from CDF2LHC
K. Goulianos
Tev4LHC3-5 February 2005
Brookhaven National Laboratory
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 2
What is Dark Energy?
* * ** * *
H He
E
M
* * ** * *
H He
E
M
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 3
Rapidity Gaps
Gaps are exponentially suppressed
From Poisson statistics:
dy
dneyP y )(
(=particle density in rapidity space)
Rapidity gaps are formed bymultiplicity fluctuations.
Non-diffractive interactions
Bj, PRD 47 (1993) 101: regions of (pdeudo)rapidity devoid of particles
ε122
0t M
1~
dM
dσΔy2εe~Δyd
dσ
2lnlnln Msy
Rapidity gaps at t=0 grow with y.Diffractive interactions
pp /
2: negative particle density!
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 4
CDF Run I results
93(2004)141601
http://physics.rockefeller.edu/dino/my.html
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 5
valence quarks
antiproton
x=
Single Diffraction
proton
)or(1
)( xxfx
g=0.20
q=0. 04
R=-0.5
g=0.5
q=0.3
SOFT HARD
deep sea
Derive diffractivefrom inclusive PDFsand color factors
antiproton
valence quarks
p
p
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 6
Inclusive Single Diffraction
Unitarity problem: Using factorization and std pomeron flux SD exceeds T at Renormalization: normalize the Pomeron flux to unity
)(Mσξ)(t,fdtdξ
σd 2XpIPIP/p
SD2
KG, PLB 358 (1995) 379
TeV.2s
1dtdξξ)(t,f0.1
ξ
IP/p
0
tmin
2~ sSD
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 7
A Scaling Law in Diffraction
KG&JM, PRD 59 (1999) 114017
Factorization breaksdown in favor of
M2-scaling
12
2
2 )(M
s
dM
d
renormalization
1
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 8
Elastic and Total Cross Sections
ytel etsf ),(Im
y sy ln
The exponential rise of T(y’) is dueto the increase of wee partons with y’
(see E. Levin, An Introduction to Pomerons,Preprint DESY 98-120)
yooT ess )(
y sy ln
QCD expectations
Total cross section:power law rise with energy
Elastic cross section:forward scattering amplitude
s
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 9
Soft Diffraction
yy
yt ,2 independent variables:
yo
ytp eetFC
yddt
d
222
)(
gap probability
Renormalization removes the s-dependence SCALING
ye 2~ 22ln
minsydyssy
y
t
colorfactor
17.0)0(
)(
ppIP
IPIPIP tg
(KG, hep-ph/0205141)
sub-energy x-section
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 10
The Factors and Experimentally: KG&JM, PRD 59 (114017) 1999
g=0.20
q=0.04
R=-0.5
fg=gluon fractionfq=quark fraction
λx
1f(x)x
18.03
125.0
8
175.0
121f
1
1f
2
Q
NN cq
cgColor factor:
12.0ww qqgg Pomeron intercept:
104.0,02.017.0
pIP
IPIPIPg
λ
/sxs~dxxf
1
1)(
CTEQ5L
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 11
Multigap Diffraction
ye 2~ 22ln
minsyssy
y
Same suppressionas for single gap!
2122
2-1i1
2
51
5
)( yyo
ytp
ii
eetFCdV
dii
Gap probability Sub-energy cross section(for regions with particles)
1y 2y1y 2y
1y 2y
1t 21 yyy 5 independent variables2t color
factors
(KG, hep-ph/0205141)
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 12
Central and Two-Gap CDF Results
One-gap cross sections are suppressed Two-gap/one-gap ratios are 17.0
Differential shapes agree with Regge predictions
DD SDD DPE
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 13
Gap Survival Probability
0.23GeV)(1800S gapgap/01gapgap/12
0.29GeV)(630S gapgap/01gapgap/12
S =
Results similar to predictions by:Gotsman-Levin-MaorKaidalov-Khoze-Martin-RyskinSoft color interactions
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 14
Diffractive DIS @ HERA
),(1
),,( 221
2)3(2 QQ xFxF D
eQ2*
p
jet
reorganize
Factorization holds: J. Collins
e*
tp
IP
Pomeron exchange Color reorganization
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 15
Inclusive vs Diffractive DIS
CCF
Q
QQD
1212)3(
2
1
)()(
)(1),,(
2
P(0)-1(q)/2
F2 ~ x
q
KG, “Diffraction: a New Approach,” J.Phys.G26:716-720,2000 e-Print Archive: hep-ph/0001092
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 16
diff/incl DIS at HERA
At fixed x:flat Q2-dependence
At fixed Q2:flat x-dependence
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 17
Diffractive Dijets @ Tevatron
),/(1
),,( 22
21 QQ xFxF D
pjet
reorganizep
jet
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 18
FDJJ(,Q2) @ Tevatron
C
sx
CF
Q
QQD
2122111
)/(
)(1),,(
)(
22
2
εε
2sβ
1~
β
xξ1
ξ 211
renorm sβξ
dξN
minmin
min
)2(
)(1
121
~R2
RENORM
x
QsxSD
ND
4.02.0 xg
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 19
SD/ND Dijet Ratio vs xBj@ CDF
(x)F
(x)FR(x) ND
jj
SDjj
0.035 < < 0.095
Flat dependence
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 20
Tevatron vs HERA:Factorization Breakdown
dN/dgap dN/dgap
p
ppIP
CDF
H1
p
ppIP
e*
tp
IP
Predicted in KG, PLB 358 (1995) 379
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 21
New: FDJJ() from ZEUS-LPS Data
Fit includingcharm data
Fit withoutcharm data
ZEUS
H1
M. Arneodo, HERA/LHC workshop, CERN, 11-13 Oct 2004
Flat after subtractingReggeon contribution
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 22
Restoring Factorization @ Tevatron
R(SD/ND)
R(DPE/SD)DSF from two/one gap:factorization restored!
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 23
CDF2LHC
TOPIC STATUS
(Q2, t) dependence of DSF close to ready
Exclusive c production close to ready
Low mass states in DPE need good trigger
Exclusive b-bbar production in DPE need b-trigger
-dependence of DSF need low lum run
Jet-gap-Jet w/jets in miniplugs need low lum run
compositeΔyΔy
BFKLΔyΔyjetgap
jetgap
gapΔyjetΔy
Tev4LHC @ BNL 3-5 Feb 2005
Diffraction from CDF2LHC K. Goulianos 24
Diffraction @ LHC
Multigap diffraction
Exclusive production of high mass states