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Transcript of Clara MatteuzziFPCP, Paris 2-6 june 2003 The LHCb experiment: status and physics program Clara...
![Page 1: Clara MatteuzziFPCP, Paris 2-6 june 2003 The LHCb experiment: status and physics program Clara Matteuzzi On behalf of the LHCb collaboration Universit.](https://reader036.fdocuments.us/reader036/viewer/2022062600/5a4d1b9d7f8b9ab0599c6407/html5/thumbnails/1.jpg)
Clara Matteuzzi FPCP, Paris 2-6 june 2003
The LHCb experiment: status and physics program
Clara MatteuzziOn behalf of the LHCb collaboration
Università Milano-Bicocca and I.N.F.N. Milano
FPCP Paris, 2-6 June 2003
![Page 2: Clara MatteuzziFPCP, Paris 2-6 june 2003 The LHCb experiment: status and physics program Clara Matteuzzi On behalf of the LHCb collaboration Universit.](https://reader036.fdocuments.us/reader036/viewer/2022062600/5a4d1b9d7f8b9ab0599c6407/html5/thumbnails/2.jpg)
Clara Matteuzzi FPCP, Paris 2-6 june 2003
The LHCb experimentLHCb is a forward one-arm spectrometer dedicated mainly to study CP violation and rare B decaysat LHC
Check consistency of the Standard Model :precision measurements of angles and sides of the CKM triangle
Search for New Physics :rare and SM forbidden decays of b particles
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
The triangleConsistency of the Standard Model (assumed to determine the vertex) and the direct measurementof sin2β from B-factories
Present status
|Vcb| from BHcX decays A|Vub| from BHu decays Bd-Bd mixing, md no
w 2007
2008
LHCb
BdJ/KS Bd
BsJ/ Bs DsK
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
newparticles
b = 1: Decays through penguin
b = 2 : Oscillations through box
through tree
newparticles
b d, s
b d, s
newparticles
d,s b
b d, s
d,s b
lor l
lor l
The Standard Model tree process not affected.
New physics
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
b at the LHC machine
Ecm
14 TeV
L(cm-2 s-1) 2 x 1032 (10-100)
(bb)
500 b
(inel)
80 mb
#bb-pairs 1012 /yearb fraction
5 x 10-3
f 40 MHz t bunch
25 ns
z primary
5 cm
inter/xing
0.4 (2-20)
(IP1,IP5)
Luminosity locally controlled
All types of b-hadronsBu , Bd , Bs , Bc , b , b , b,...with large boost of the hadron
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
b - physics at LHC
Crucial tasks of a detector:
triggering
particle ID identification of exclusive final states (K/p/e/) tagging
background rejection decay time resolution
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
The LHCb detector layout1.5 < | | < 3.5Aperture ~ 15 – 300 (250) mrad
Hcal (Hcal (15% modules produced15% modules produced))Fe + scintillator tiles 1468 cells, 5.6 Iσ/E ~ 75% / sqrt(E)
Shashlik type (66layers 2mm Pb/4mm scintillator)Transverse granularity 4,6,12 cm cells~6000 channels , 25 Xoσ/E ~ 10%/sqrt(E)
EcalEcal 70% modules produced
Dipole magnet :• Warm trapezoidal coils • pole shape following the acceptance• Bdl = 4 Tm• P = 4.2 MW
chambers MWPCs
40% 40% XXoo , , 12%12% II
~1.41.2 m2~65 m2
3 stations 4 layers each 320 μm thin silicon 198 μm readout pitch. 130k readout channels.
IInner nner TTrackerracker
3 stations with 4 double layers 5 mm straws tubes Fast drift gas (signal within 50 ns) 75% Ar 15%CF410%CO2
50k readout channels.
OOuter uter TTrackerracker
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
The LHCb Vertex Locator
low occupancy Si area : 0.32 m2
#Xo : 0.18 t : 43 fs # channels : 172 k
21 stations
3217IPT
mmp
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Tracking performance
Average efficiency = 92 %Efficiency for p>5GeV >95%
Ghost rate pT>0.5 GeV ~ 7%.
Mass resolution Mass resolution ((~13 MeV)~13 MeV)
for the decay channelBs Ds +
KKπ
Momentum resolution:Momentum resolution:
p/p=0.38%
Proper timeProper time resolution resolution (42 fs)(42 fs)
<N> = 27 tracks/event <N> = 27 tracks/event
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
The RICH of LHCb2 detectors with 3 radiators (aerogel, C4F10, CF4) cover momentum range: 2 - 100 GeV
RICH 1
5 cm aerogel4 m3 C4F10
(25-300 mrad)
K separation
RICH 2
100 m3 CF4
(15-120 mrad)
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Bs Ds K
Purity=66% efficiency=88%
Physics with Particle Identification
Bs K+K-
Purity=7.0%Purity=13%
Purity=84%Efficiency=79%
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
LHCb Trigger
Level-0
Higher Levels
data log
40 MHz
1 MHz
40 KHz
200 Hz
CalorimetersMuonPile-up veto
VELOTrigger TrackerLevel-0
Level-1
all the detector
pT of e, , h ,
Impact parameterRough p estimate ( ~20%)
final statereconstruction
subdetectors
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
LHCb L1 trigger
Performance in B decays
trigger robust and flexibletrigger robust and flexible hadron trigger fundamental hadron trigger fundamental for hadronic final statesfor hadronic final states trigger efficiencies L0xL1trigger efficiencies L0xL1 20 % - 70%20 % - 70%
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
MC Pythia 6.2 tuned on CDF and UA5 data Multiple pp interactions and spill-over effects included Complete description of material from TDRs Individual detector responses tuned on test beam results Complete pattern recognition in reconstruction
Simulated bb events Simulated bb events
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Event yield in LHCb
Channel YieldB0 27 kB0 K 115 kBs KK 35 kBs Ds
72 kBs Ds
-K+ 8 kBs J/ 109 kBs J/e-e 19 kB0 J/KS 119 kB0K0 20 k
1 year = 1 year = 2 fb 2 fb -1-1 ( (LL = 2x10 = 2x103232 cm cm–2–2ss-1-1))
Yield calculated taking into account : Geometrical acceptance, detection efficiency, material L0 and L1trigger efficiencies (including pile-up veto) Reconstruction efficiencies (tracking, calorimeters, PID) Selection cuts efficiency to identify the final state
more background simulated events are necessaryto optimize selection criteria vs background rejection
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Measuring 4 ways of determining
Time dependent analysis of BsD+sK(tagged)
Rate difference between B-DoK- and B+DoK+ (untagged) model independent
Rate measurements in Ko and K(Fleisher-Mannel)or rates in Ko and asymmetry in K(Neubert-Rosner, Beneke et al) Measure time dependent asymmetries in (Fleischer,Martinelli)
Bo and BsKKsymmetric d s dependence on hadronic assumptions in the different calculations
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
with Bs Ds±K+
() ~ 100 for ms = 20 ps–1
() ~ 120 for ms = 30 ps–1
Measuring
must be separated from (~15 times larger Br)
Ds mass resolution (GeV)
Bs vtx resolution (mm)
gets (needs 2 from Bs –>J/Ψ Φ )
hadronic trigger, K/π separation, proper time resolution are fundamental
In one year of data (2 fb-1) 8k Ds K and 72k Ds π
expected sensitivity:
depending on amplitudes, strong phases, γ, Δms, ΔΓ/Γ
Bs Ds–+
measure Bs oscillations
Δms up to ~ 60 ps-1
Bs Ds–+
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Study of B0s J/
Must be separated from prompt J/Ψ production (possible with 0.1 < B/S < 0.4 at 90% CL )
prompt J/() background B0s J/() signal
K+K–)
CP asymmetries determine –2δγ (very small in Standard Model but sensitive to New Physics). And also Δms and ΔΓs
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Study of B0s J/
Needs angular analysis to disantangle CP-odd and CP-even states
In one year of data (2 fb-1) 109k J/Ψ Φ and 19k J/Ψ Φ () (ee)
σ(2δγ) ~ 20 for ms = 20 ps–1
expected sensitivity:
K+K–)
also B0s ΦΦ
(under study in LHCb) B0
s ηcΦ probe δγ B0s J/Ψ η
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Measuring
withwith B B(s)(s) KKK K KK
σ(γ) ~ 30 for xs = 20
Relies on hadronic trigger, excellent K/π separation, mass resolution
Select B candidates with pT, IP/σ, L, mass cuts Combinatorial bb bckgr. can be rejected (S/B > 1)
92% purity 96% purity 98% purity
B0 B0 K B0s KK
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Present estimate of LHCb Physics reach
ChannelChannel Yield Yield PrecisionPrecision Bd J/Ks 119 k 0.6o
Bs DsKBd , Bs KK
8 k 27 k, 35 k
10o
3o
Bd 27 k 5o- 10o
Bs J/ 128 k 2o
|V|Vtdtd/V/Vtsts Bs Ds 72 k ms up to 58 ps
rare rare decaysdecays Bd K 20 k
1 year data 2 fb–1
These numbers are being updated, and more channels studied, in the re-optimization of the LHCb detector to be concluded in September 2003
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Conclusions
The present of b-physics is already very rich The future : Next generations of dedicated experiments at hadron machines will have order of 1012 bb pairs per year with dedicated trigger and particle ID LHCb is a unique opportunity to measure precisely angles
and sides of the CP triangle and to understand the origin of CP violation in the SM and beyond
B-factories (BaBar, Belle, CLEO), Tevatron, + (LEP, SLC)
LHCb installation starts in 2005data taking starts in 2007
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
Back-up slides
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Clara Matteuzzi FPCP, Paris 2-6 june 2003
LHCb TRIGGER
channel L0 (%) e h all
L1(%) Total (%)
90 5 30 3 7 36 24 4 8 5 37 2 6 28 30 47 7 9 55 3
9352448261
73 43 65 33 51
68 23 29 27 31
B0s J/()
B0s J/(ee)
B0s Ds K
B0d K*
B0d + –