performance evaluation for open charm and beauty measurement at lhc alice

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Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE PID capability from λ and K s 0 measurement at LHC ALI CE 筑筑筑筑筑筑筑筑筑筑筑筑筑 Kengo Watanabe for the ALICE Collaborati

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Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE. PID capability from λ and K s 0 measurement at LHC ALICE. 筑波大学数理物質科学研究科 Kengo Watanabe for the ALICE Collaboration. ALICE Detector Over View. TRD. TOF. HMPID. ITS. PMD. Muon Spectrometer. TPC. PHOS. - PowerPoint PPT Presentation

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Page 1: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Performance Evaluation for Open Charm and Beauty

Measurement at LHC ALICE

PID capability from λ and Ks0 meas

urement at LHC ALICE

筑波大学数理物質科学研究科Kengo Watanabe for the ALICE Collaboration

Page 2: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

ALICE Detector Over View

TRDTOFHMPID

PMD

PHOS TPC

Muon Spectrometer

ITS

Page 3: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

• To provide constrains on parton energy loss

at the very early stage of the collisions

(time-scale ~ 1/mQ < τQGP ~ 10 fm at LHC)

• c,b have long lifetime (> τQGP) and can probe the bulk,

strongly interacting phase

study of final state effects• Elliptic flow

Open Charm and Open Beauty Measurement

QuickTime˛ Ç∆TIFFÅiîÒà≥èkÅj êLí£ÉvÉçÉOÉâÉÄ

ǙDZÇÃÉsÉNÉ`ÉÉÇ å©ÇÈÇΩÇflÇ…ÇÕïKóvÇ≈Ç∑ÅB

( )( )RPv Ψ−= ϕ2cos2

V2 provides information on the opacity of the medium

Page 4: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Heavy flavour measurements in ALICE

Weak decaying charm and beauty

D+ m ~ 1869 MeV, cτ ~ 312 μmD0 m ~ 1865 MeV, cτ ~ 123 μmDs

+ m ~ 1968 MeV, cτ ~ 147 μm

B+ m ~ 5279 MeV, cτ ~ 501 μmB0 m ~ 5279 MeV, cτ ~ 460 μmBs

0 m ~ 5370 MeV, cτ ~ 438 μmBc

+ m ~ 6400 MeV, cτ ~ 100~200 μm

Primary vertex

Decay vertex

Heavy flavour weak decay track is displaced from primary vertex by ~ few 100 μm

Decay vertex will be observed with help of the ITS

Inner Tracking System contain 6 silicon layerssilicon pixel detector reconstruct secondary vertex

Secondary tracks will be reconstructedwith help of the ITS,TPC,TRD and TOF

Page 5: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Outline• Simulation Data

0.9GeV minimum bias event

PYTHIA, ALICE GEANT• Reconstruction

all simulation data were reconstructed

-> track, vertex ,signal in each detector

• PID (ITS,TPC,TOF)

• λ and Ks0 measurements

invaliant mass, S/N,S*S/N

PID cut, Pt dependence   ALICE detector performance

Page 6: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Particle Identification in ALICE 1

ITS

TPC

All signal cut (track length = 0) cut (combined bands)

π

π

K

p

e

Kp

Page 7: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Particle Identification in ALICE 2

Before cut After cut

π

K

p

Page 8: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

• Input data

0.9 TeV pp minimum bias.

1 M events reconstructed data (ALICE official data)

• Electron data

3000 events (NO TRD PID)

TRD show other particle contamination

in TPC electron band

PID Summary

Open charm and Open Beauty production are difficult for my data

ALICE performance using Ks0 and λ

Page 9: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

λ & Ks0   invaliant mass

(ITS && TPC) or TOF ITS or TPC or TOF ITS or TPC or TOFmix

λ->p+π (unlike pair)  

Ks0->π+π (unlike pair) 

Page 10: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

S/N

 

(ITS && TPC) or TOF ITS or TPC or TOF ITS or TPC or TOFmix

S/N=1.74 1.60 1.59

1.19 1.15 1.15

background

signal

λ

Ks0

S*S/N = 260364

S=226385S/N=

S*S/N=15235.9

S/N=S=9533

S*S/N=260288

S/N=S=226329

S*S/N=15232.5

S/N=S=9515

S*S/N=149771

S/N=S=126290

S*S/N=11665.7

S=6714

Page 11: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Pt cut

0<Pt<0.25 0.25<Pt<0.5 0.5<Pt<0.75 0.75<Pt<1.0

1.0<Pt<1.5 1.5<Pt<2.0 2.0<Pt<2.5 2.5<Pt<3.0

λ

Page 12: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

Pt dependence of S/N

(ITS && TPC) or TOF

Pt (GeV/c)Pt (GeV/c)

ITS or TPC or TOF

ITS or TPC or TOFmix

S/N S/N

TOF

ITS,TPC

Ks0λ

TOFITS,TPC

S/Nits ≒ S/Ntpc

PID capability of ITS and TPCis certain

Page 13: Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

• Particle identification of ALICE central detector (ITS,TPC,TOF) using simulation data

• S/N, S*S/N from λ and Ks0 mass spectrum

• S/N show good PID capability of ITS and TPC• S*S/N show miss ID particle can be ignored

Summary

ALICE will be able to Identified rare particle, D,B,J/Ψ,Υwith help of vertex detector and PID detector