atlas first run scenarios for b physics
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ATLAS first run scenarios ATLAS first run scenarios for for
B physicsB physics
Paula Eerola, Lund UniversityPaula Eerola, Lund UniversityOn behalf of the ATLAS collaborationOn behalf of the ATLAS collaboration
Beauty 2006, Oxford, 25-29 September 2006Beauty 2006, Oxford, 25-29 September 2006
Paula Eerola, Lund UniversityPaula Eerola, Lund UniversityBeauty 2006, Oxford, 25-29 September Beauty 2006, Oxford, 25-29 September
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This talk includes:This talk includes:
IntroductionIntroduction A summary of the LHC start-up scenarioA summary of the LHC start-up scenario B-production in the LHC commissioning run B-production in the LHC commissioning run
(450 GeV + 450 GeV) until the end of 2007.(450 GeV + 450 GeV) until the end of 2007. The first physics run at 14 TeVThe first physics run at 14 TeV
a)a) Role of B-physics and Heavy Quarkonia Role of B-physics and Heavy Quarkonia events in understanding the detector, trigger events in understanding the detector, trigger and online/offline software with 100 pband online/offline software with 100 pb -1-1..
b)b) Strategies for B-physics with 100 pbStrategies for B-physics with 100 pb -1-1 - 1 fb - 1 fb-1-1
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IntroductionIntroduction ATLAS is a general-purpose ATLAS is a general-purpose
experiment, with an experiment, with an emphasis on high-pemphasis on high-pTT physics physics beyond the Standard Model.beyond the Standard Model.
ATLAS has also capabilities ATLAS has also capabilities for a rich B-physics for a rich B-physics programme, thanks to programme, thanks to precise vertexing and precise vertexing and tracking, high-resolution tracking, high-resolution calorimetry, good muon calorimetry, good muon identification, and a identification, and a dedicated and flexible B-dedicated and flexible B-physics trigger scheme.physics trigger scheme.
ATLAS has a well-defined B-ATLAS has a well-defined B-physics programme for all physics programme for all stages of the LHC operation, stages of the LHC operation, from the commissioning run from the commissioning run all the way up to the highest all the way up to the highest luminosity running.luminosity running.
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ATLAS B-physics goals: ATLAS B-physics goals: precision measurements and precision measurements and new physicsnew physics
mmss, , ss, , ss, , the weak phase the weak phase ss
Measurement Measurement of Bof Bs s
propertiesproperties
Precise measurements of the Precise measurements of the branching ratios and asymmetriesbranching ratios and asymmetriesRare decaysRare decays
Asymmetry parameter Asymmetry parameter bb, P, Pbb, , life-time measurementslife-time measurements
bb polarization polarization measurementsmeasurements
BBcc mass, mass, , QCD/EW interplay, QCD/EW interplay BBcc mesons mesons
sin(2sin(2) +) +NPNPCP violationCP violationeeJ
KJBsd
//
)(/ 0
)()(/
)()(/
,
JB
KKJB
ds
s
1,; aDBDB
sdsss
00
0*0
,
;
;
sb
dds
B
KBB
)()(/ pJb
/;/ JBJBcc
• CP-violation parametersCP-violation parameters• B-hadron parametersB-hadron parameters: masses, lifetimes, widths, oscillation : masses, lifetimes, widths, oscillation parameters, couplings, b-production, etc.parameters, couplings, b-production, etc.• Search for New Physics effectsSearch for New Physics effects: very rare decay modes, : very rare decay modes, forbidden decays/couplings, etc.forbidden decays/couplings, etc.
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News from the LHC machine
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P. Jenni ATLAS Overview Week July 2006
A new LHC schedule and turn-on strategy was presented to the A new LHC schedule and turn-on strategy was presented to the CERN SPC and Council June 2006. The main features of the new CERN SPC and Council June 2006. The main features of the new schedule are:schedule are:
The beam pipe closure date will be end of August 2007. The beam pipe closure date will be end of August 2007. LHC commissioning run with collisions LHC commissioning run with collisions at the injection energy (√s at the injection energy (√s =900 GeV), scheduled November 2007=900 GeV), scheduled November 2007. Luminosity typically L = . Luminosity typically L = 10102929cmcm-2-2ss-1-1.. During the commissioning run at 900 GeV the LHC will be a static During the commissioning run at 900 GeV the LHC will be a static machine, no ramp, no squeeze, to debug the machine and the machine, no ramp, no squeeze, to debug the machine and the detectors. detectors. Then there will be a shut-down (typically 3 months) during which Then there will be a shut-down (typically 3 months) during which the remaining machine sectors will be commissioned without beam the remaining machine sectors will be commissioned without beam to full energy (√s = 14 TeV).to full energy (√s = 14 TeV). After that the LHC will be brought into operation for After that the LHC will be brought into operation for the first the first physics run at 14 TeV, with the aim to integrate substantial physics run at 14 TeV, with the aim to integrate substantial luminosity by the end of 2008: goal several fbluminosity by the end of 2008: goal several fb-1-1 by the end of 2008. by the end of 2008.
New LHC machine schedule
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The commissioning runThe commissioning run
b cross section dominates at both √s = 900 GeV and 14 TeV.
At √s = 900 GeV the b fraction of total inelastic events is ~10 x smaller than at 14 TeV.
• The run in 2007 will The run in 2007 will primarily be a detector and primarily be a detector and computing commissioning computing commissioning run, much more than a run, much more than a physics run. physics run. • A few weeks of stable A few weeks of stable running conditions at the running conditions at the injection energy.injection energy.
b
b
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Triggers for the Triggers for the commissioning runningcommissioning running
√√s = 0.9 TeV, L = 10s = 0.9 TeV, L = 102929cmcm-2-2ss-1-1, , inelinel=40 mb <=> 4 =40 mb <=> 4 kHz interaction ratekHz interaction rate
Commissioning the detector, the trigger, the Commissioning the detector, the trigger, the offline reconstruction and analysis chainsoffline reconstruction and analysis chains
Data taking with loose level-1 (LVL1) single Data taking with loose level-1 (LVL1) single muon triggers (pmuon triggers (pTT>5 GeV) or minimum bias >5 GeV) or minimum bias triggerstriggers
The High Level Trigger (HLT) in pass-through The High Level Trigger (HLT) in pass-through mode for testingmode for testing
See J. Kirk’s talk on ATLAS triggersSee J. Kirk’s talk on ATLAS triggers
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DecayDecay RateRate N(ev) forN(ev) for1 d* 1 d*
N(ev) for N(ev) for 30 d*30 d*
Min bias hadron Min bias hadron 55X |X ||<2.5|<2.5
1400 * 101400 * 10-4-4 Hz Hz 3 6003 600 109 000109 000
b b 55X X 60 * 1060 * 10-4 -4 Hz Hz 150150 4 700 4 700
b b 5533XX 2 * 102 * 10-4-4 Hz Hz 5.25.2 150150
b b J/J/5533 XX 0.1 * 100.1 * 10-4 -4 Hz Hz 0.30.3 88
pp pp J/ J/5533XX 1 * 101 * 10-4 -4 Hz Hz 33 8080
pp pp 5533 1.7 * 101.7 * 10-4 -4 HzHz 4.44.4 130130
*) 1 full day is 8.64 * 104 s, 30% machine and data taking efficiency assumed
√√ss =900 GeV, L=1029cm-2s-1
Rates and statistics
b
b
b
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Event statistics with B and Quarkonium muonic decays
bb 5 X
bb 53 X
pp J/ (53) X
pp (53) X
√√ss =900 GeV, L=1029cm-2s-1
h 5 X
bb J/ (53)X
Number of days of data taking
Nu
mb
er
of
even
ts in
ATLA
S a
fter
all
cu
ts
30% machine and data taking efficiency assumed. Reconstruction and trigger efficiencies included.
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Event statistics for the commissioning run
W e Z ee
bb 53Xpp + bb J/(53)X
√√ss =900 GeV, L=1029cm-2s-1
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Conclusions for Conclusions for the the commissioning commissioning runrun Heavy flavours b and c will be a source of ~4.7k single muons and Heavy flavours b and c will be a source of ~4.7k single muons and
~370 di-muons given 30 days of beam (30% machine and data ~370 di-muons given 30 days of beam (30% machine and data
taking efficiency).taking efficiency).
Soft LVL1 single-muon trigger can be used to select those events.Soft LVL1 single-muon trigger can be used to select those events.
High-level trigger in pass-through mode.High-level trigger in pass-through mode.
The dimuon sample includes about 90 J/The dimuon sample includes about 90 J/ and 130 and 130 – –
can serve for first tests of mass reconstruction.can serve for first tests of mass reconstruction.
Any heavy flavour physics? Low statistics will not allow Any heavy flavour physics? Low statistics will not allow
separating direct and indirect J/separating direct and indirect J/sources. S/B a factor of 10 sources. S/B a factor of 10
worse than at the nominal LHC c.m. energy. Muons from hadron worse than at the nominal LHC c.m. energy. Muons from hadron
decays dominate the trigger rate due to worse S/B and softer decays dominate the trigger rate due to worse S/B and softer
spectrum. The ratio of J/spectrum. The ratio of J/and and events may be the best bet. events may be the best bet.
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The first physics run: The first physics run: B-physics strategiesB-physics strategies- Serve as a tool for understanding the trigger and - Serve as a tool for understanding the trigger and
the detector: calibration, alignment, material, the detector: calibration, alignment, material,
magnetic field, event reconstruction.magnetic field, event reconstruction.
- Physics: cross-section measurements at new - Physics: cross-section measurements at new
energy - QCD tests and optimization of B-trigger energy - QCD tests and optimization of B-trigger
strategies.strategies.
- Control B-channels will be used to verify if we - Control B-channels will be used to verify if we
measure correctly well known B-physics quantities measure correctly well known B-physics quantities
(with increasing integrated luminosity (with increasing integrated luminosity real real
measurements).measurements).
- Control B-channels will also be used to prepare for - Control B-channels will also be used to prepare for
high-precision B-measurements and searches for high-precision B-measurements and searches for
rare decays: tagging calibration, production rare decays: tagging calibration, production
asymmetries, background channels specific for rare asymmetries, background channels specific for rare
decays.decays.
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Trigger priorities for Trigger priorities for the first physics the first physics runningrunning
√√s = 14 TeV, L = 10s = 14 TeV, L = 1032-3332-33cmcm-2-2ss-1-1
Many customers for the dataMany customers for the data– Data for commissioning the detector, the trigger, Data for commissioning the detector, the trigger,
the offline reconstruction and analysis chainsthe offline reconstruction and analysis chains– Data samples high-pData samples high-pTT physics studies physics studies– Data samples for B-physics studiesData samples for B-physics studies
Scope depends on luminosity and available Scope depends on luminosity and available HLT resourcesHLT resources
– Data samples for “minimum-bias” physics Data samples for “minimum-bias” physics studiesstudies Needed also for tuning Monte Carlo generators Needed also for tuning Monte Carlo generators
used in other physics studiesused in other physics studies
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Trigger menus for B-Trigger menus for B-physicsphysics
The ATLAS B-physics programme is based on LVL1 muon The ATLAS B-physics programme is based on LVL1 muon triggers triggers – Inclusive low-pInclusive low-pTT single-muon triggers at low luminosity single-muon triggers at low luminosity– Low-pLow-pTT dimuon triggers at higher luminosities dimuon triggers at higher luminosities
Search for specific final states (exclusive or semi-Search for specific final states (exclusive or semi-exclusive) in HLT exclusive) in HLT – Refine muon selection, then reconstruct Refine muon selection, then reconstruct
tracks from B decays in the inner tracks from B decays in the inner detector (ID)detector (ID)
Tracks in ID: track search in the full ID Tracks in ID: track search in the full ID or in regions given by LVL1 Regions of or in regions given by LVL1 Regions of Interests (RoIs), depending on the HLT Interests (RoIs), depending on the HLT processor capacity and luminosityprocessor capacity and luminosity
See J. KirkSee J. KirkEM RoI
e+ e-
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B cross-section at B cross-section at LHCLHC
• All LHC experiments plan to All LHC experiments plan to measure B-cross section in measure B-cross section in proton-proton collisions. proton-proton collisions.
• Measurements will cover Measurements will cover different phase space – will be different phase space – will be complementary.complementary.
• Partial phase-space overlaps: Partial phase-space overlaps: LHCb, ATLAS, CMS, ALICE - LHCb, ATLAS, CMS, ALICE - opportunity for cross-checks.opportunity for cross-checks.
• Methods of measurement for Methods of measurement for low- and medium-plow- and medium-pTT events in events in ATLASATLAS • b 6 X ;• b → 63 X; • Exclusive channels B+→J/
K+, B0→ J/ K0*
• b- correlations: B→J/ X +
b =J/ -
b
b
b
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Statistics for cross-section and correlation measurements
DecayDecay Statistics Statistics with 10 pbwith 10 pb-1-1
Statistics Statistics with 100 pbwith 100 pb-1-1
b b 66XX 40 M40 M 400 M400 M
c c 66XX 20 M20 M 200 M 200 M
b b XX 2 M2 M 20 M20 M
B B J/J/ X X and b and b X X
2 5002 500 25 00025 000
BB++→→J/J/KK++ 1 7001 700 17 00017 000
BB00→ → J/J/KK0*0* 870870 8 7008 700
b
b
c
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DecayDecay Statistics Statistics with 100 with 100 pbpb-1-1
MeasurementMeasurement
pp pp →→ J/ J/6633 1000 k1000 k R(b R(b → → J/J/)/R()/R(pp pp → → J/J/R(pp R(pp → → /R(/R(pp pp → → J/J/b b J/J/6633XX 400 k400 k
6633 100 k100 k
B-physics with 100 pbB-physics with 100 pb-1-1: : J/J/ and and
b
b
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B physics with 100 pbB physics with 100 pb-1-1: : exclusive B decaysexclusive B decaysDecayDecay Statistics withStatistics with
100 pb100 pb-1-1
MeasurementMeasurement
BB++→→J/J/KK++ 17 00017 000 Important reference Important reference and control channel: and control channel: new channels (Bnew channels (B→→) ) relative to this. relative to this.
BB00→ → J/J/KK0*0* 8 700 8 700 Control channels: Control channels: masses, lifetimes masses, lifetimes etc.etc.
Sensitive checks for Sensitive checks for understanding the understanding the Inner Detector.Inner Detector.
BB00→ → J/J/KKss 1 3001 300
BBss→ → J/J/ 900900
bb→→ J/ J/ 260260
BBss →→ D Dss 2525 Hadronic channels – Hadronic channels – only prepare only prepare methods for later methods for later measurements.measurements.
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The reconstructed masses and lifetimes of the The reconstructed masses and lifetimes of the well-known control channels are sensitive well-known control channels are sensitive tests of those detector features which have a tests of those detector features which have a strong impact on B-physics measurements.strong impact on B-physics measurements.
DecayDecay StatisticStatisticss
100 pb100 pb-1-1
Statistical Statistical error on error on lifetime lifetime
World av today World av today (stat + (stat + syst) syst)
BB++ BB++→→J/J/KK++ 17 00017 000 1.5 %1.5 % 0.4 %0.4 %
BB00 BB00→ → J/J/KK0*0* 8 7008 700 2.2 %2.2 % 0.5 %0.5 %
BBss BBss→ → J/J/ 900900 6 %6 % 2 %2 %
bb bb→→ J/J/ 260260 8 %8 % 5 %5 %
Lifetime “reconstruction” Lifetime “reconstruction” with control channelswith control channels
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B physics with 100 pbB physics with 100 pb-1-1: : sensitivity to sensitivity to rare rare exclusive B decaysexclusive B decays
DecayDecay Statistics Statistics or limit or limit withwith
100 pb100 pb-1-1
Measurement todayMeasurement today
BB++→→KK++ 2323 Belle today 80?Belle today 80? BB00→ → KK0*0* 1212
BBss→ → 99
bb→→ 33
BBss→→ 6.4×106.4×10-8-8 at at 90% C.L.90% C.L.
CDF currently 8.0x10 CDF currently 8.0x10 -8 -8
at 90% C.L.at 90% C.L.
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BB00ss→ µ→ µ++µµ-- with 100 pb with 100 pb-1-1, ,
10 fb10 fb-1-1 and 30 fb and 30 fb-1-1
IntegrateIntegrated LHC d LHC
luminositluminosityy
N(signaN(signal) after l) after all cutsall cuts
N(backgr.) N(backgr.) after all after all
cutscuts
ATLAS upper ATLAS upper limit for limit for
Br(Br(BB00ss→ µ→ µ++µµ-- ))
at 90% C.L.at 90% C.L.
CDF upper CDF upper limit for limit for Br(Br(BB00
ss→ → µµ++µµ-- ))
at 90% C.L.at 90% C.L.
100 pb100 pb-1-1 ~ 0~ 0 ~ 0.2~ 0.2 6 ×106 ×10-8-8
8.0×108.0×10-8-8 10 fb10 fb-1-1 ~ 7~ 7 ~ 20~ 20 1.2×101.2×10-8-8
30 fb30 fb-1-1 ~ 21~ 21 ~ 60~ 60 7 ×107 ×10-9-9
Discovery channel Discovery channel BB00ss→ µ→ µ++µµ--
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ConclusionConclusionssCommissioning run at 900 GeV, very low luminosityCommissioning run at 900 GeV, very low luminosity
Commissioning of the detector, the trigger, the offline Commissioning of the detector, the trigger, the offline reconstruction and the analysis chains.reconstruction and the analysis chains.
In 30 days ~4.7k single muons and ~370 di-muons from In 30 days ~4.7k single muons and ~370 di-muons from b and c: first tests of trigger and offline muon b and c: first tests of trigger and offline muon reconstruction.reconstruction.
90 J/90 J/ and 130 and 130 : first tests of mass reconstruction.: first tests of mass reconstruction.First physics run at 14 TeV, 100 pbFirst physics run at 14 TeV, 100 pb-1-1 – 1 fb – 1 fb-1-1
Measurements of B masses and lifetimes: a sensitive Measurements of B masses and lifetimes: a sensitive test of understanding the detector – alignment, test of understanding the detector – alignment, material, magnetic field, event reconstruction etc.material, magnetic field, event reconstruction etc.
Cross-section measurements at new energy: QCD tests Cross-section measurements at new energy: QCD tests and also optimization of B-trigger strategies.and also optimization of B-trigger strategies.
J/J/ and and measurements. measurements. Control B-channel measurements to prepare for further Control B-channel measurements to prepare for further
B physics – precision measurements and new physics B physics – precision measurements and new physics measurements.measurements.
With 100 pbWith 100 pb-1-1 ATLAS can achieve a sensitivity of ATLAS can achieve a sensitivity of 6.4×106.4×10-8-8 in the discovery channel in the discovery channel Br(Br(BB00
ss→ µ→ µ++µµ- - ), ), which which is at the level of current Tevatron results.is at the level of current Tevatron results.
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Thank you!Thank you!
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BACKUP SLIDESBACKUP SLIDES
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ProcessProcess Cross-Cross-section at √section at √s s
= 14 TeV= 14 TeV
Cross-section Cross-section at √at √s = 900 s = 900
GeVGeV Total LHC bb cross section Total LHC bb cross section 500500 bb 2525 bb
Total LHC inelastic Total LHC inelastic 7070 mbmb 4040 mbmb
Min bias hadron Min bias hadron 6(5)6(5)X |X |||<2.5<2.5
10 00010 000 nbnb 1 4001 400 nbnb
b b 6(5)6(5)X X 4 0004 000 nbnb 6060 nbnb
b b 6(5)6(5)33X*X* 200200 nbnb 22 nbnb
b b J/J/6(5)6(5)3)3)X*X* 77 nbnb 0.10.1 nbnb
pp pp J/ J/6(5)6(5)33X*X* 2828 nbnb 11 nbnb
pp pp 6(5)6(5)33 99 nbnb 1.71.7 nbnb
*) Dimuon pT cuts for muon reconstruction and identification are: (6, 3) GeV at 14 TeV and (5, 3) GeV for 900 GeV. For both muons ||<2.5.
Cross sections in ATLAS for muonic channels
b
b
b
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The figure shows sources of low-pT muons at 14 TeV.
Muons from hadron decays in flight (“h” in the figure) have a softer spectrum than muons from b.
At 900 GeV their relative contribution is larger – b fraction of total inelastic cross section ~ 10 smaller than at 14 TeV.
single-muon
di-muon
all
all
h
h
b
b
c
c
J/
Sources of low-pT single and double muons
LVL1 muon trigger rates @ 14 TeV and 1033cm-2s-1
b
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Cross sections for several dominant channels: in LHC (yellow) and in ATLAS volume (rest).
1414 TeVTeV 900900 GeVGeV
Total LHC inelastic (NSD) Total LHC inelastic (NSD) 7070 mbmb 4040 mbmb
Total LHC bb cross section Total LHC bb cross section 500500 bb 2525 bb
jet pjet pTT>15GeV |>15GeV |<2.5<2.5 2424 bb
Min bias Min bias X |X ||<2.5|<2.5 1000100000
nbnb 14001400 nbnb
b-jet pb-jet pTT>15GeV |>15GeV |<2.5<2.5 370370 nbnb
jet pjet pTT>50 GeV |>50 GeV |<2.5<2.5 4545 nbnb
bb bb X |X ||<2.5|<2.5 40004000 nbnb 6060 nbnb
bb bb X |X ||<2.5|<2.5 200200 nbnb 22 nbnb
pp pp ||||<2.5<2.5
99 nbnb 1.71.7 nbnb
pp pp J/J/X X ||||<2.5<2.5
2828 nbnb 11 nbnb
b-jet pb-jet pTT>50 GeV |>50 GeV |<2.5<2.5 0.630.63 nbnb
bb bb J/J/X X ||||<2.5<2.5
77 nbnb 0.10.1 nbnb*) muon pT cuts for 14TeV (900 GeV)
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ratesrates 30d = 1030d = 1066ss
jet pjet pTT>15GeV |>15GeV |<2.5<2.5 2424 1010-1-1 Hz Hz 2 400 0002 400 000
Min bias Min bias X |X ||<2.5|<2.5 14001400 1010-4-4 Hz Hz 140 000140 000
b-jet pb-jet pTT>15GeV |>15GeV |<2.5<2.5 370370 1010-4-4 Hz Hz 37 00037 000
jet pjet pTT>50 GeV |>50 GeV |<2.5<2.5 4545 1010-4-4 Hz Hz 4 5004 500
bb bb X |X ||<2.5|<2.5 6060 1010-4-4 Hz Hz 6 0006 000
bb bb X |X ||<2.5|<2.5 22 1010-4-4 Hz Hz 200200
pp pp ||||<2.5<2.5
1.71.7 1010-4-4 Hz Hz 170170
pp pp J/J/X X ||||<2.5<2.5
11 1010-4-4 Hz Hz 100100
b-jet pb-jet pTT>50 GeV |>50 GeV |<2.5<2.5 0.630.63 1010-4-4 Hz Hz 6363
bb bb J/J/X X ||||<2.5<2.5
0.10.1 1010-4-4 Hz Hz 1010
900 GeV 1029cm-2s-1 rates, statistics
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bb 5 X
bb 53 X
pp+bb J/ (53) X
pp (53) X
Event statistics with B and Quarkonium muonic decays
√√ss =900 GeV, L=1029cm-2s-1
40% machine and data taking efficiency assumed. No reconstruction efficiencies included.
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30% data taking efficiency included.Efficiency of all analysis cuts included.
W e Z ee
√√ss =900 GeV, L=1029cm-2s-1
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Detector configuration Detector configuration during the first physics during the first physics runrun B-layer OK.B-layer OK. ID complete, only TRT C-wheels ID complete, only TRT C-wheels
stagedstaged HLT configuration: full 45kHz HLT configuration: full 45kHz
LVL1 capacity.LVL1 capacity.
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