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

Transcript of Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICE

  • Performance Evaluation for Open Charm and Beauty Measurement at LHC ALICEPID capability from and Ks0 measurement at LHC ALICEKengo Watanabe for the ALICE Collaboration

  • ALICE Detector Over ViewTRDTOFHMPIDPMDPHOSTPCMuon SpectrometerITS

  • Open Charm and Open Beauty MeasurementTo provide constrains on parton energy loss at the very early stage of the collisions (time-scale ~ 1/mQ < QGP ~ 10 fm at LHC)c,b have long lifetime (> QGP) and can probe the bulk, strongly interacting phase study of final state effectsElliptic flow V2 provides information on the opacity of the medium

  • Heavy flavour measurements in ALICEWeak decaying charm and beautyD+ m ~ 1869 MeV, c ~ 312 mD0 m ~ 1865 MeV, c ~ 123 mDs+ m ~ 1968 MeV, c ~ 147 mB+ m ~ 5279 MeV, c ~ 501 mB0 m ~ 5279 MeV, c ~ 460 mBs0 m ~ 5370 MeV, c ~ 438 mBc+ m ~ 6400 MeV, c ~ 100~200 mPrimary vertexDecay vertexHeavy flavour weak decay track is displaced from primary vertex by ~ few 100 mDecay vertex will be observed with help of the ITSInner Tracking System contain 6 silicon layerssilicon pixel detector reconstruct secondary vertexSecondary tracks will be reconstructedwith help of the ITS,TPC,TRD and TOF

  • OutlineSimulation Data 0.9GeV minimum bias event PYTHIA, ALICE GEANTReconstruction all simulation data were reconstructed -> track, vertex ,signal in each detector

    PID (ITS,TPC,TOF) and Ks0 measurements invaliant mass, S/N,S*S/N PID cut, Pt dependenceALICE detector performance

  • Particle Identification in ALICE 1ITSTPCAll signalcut (track length = 0)cut (combined bands)KpeKp

  • Particle Identification in ALICE 2Before cutAfter cutKp

  • PID SummaryInput 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 Open charm and Open Beauty production are difficult for my dataALICE performance using Ks0 and

  • & Ks0invaliant mass(ITS && TPC) or TOFITS or TPC or TOFITS or TPC or TOFmix->p+ (unlike pair)Ks0->+ (unlike pair)

  • S/N(ITS && TPC) or TOFITS or TPC or TOFITS or TPC or TOFmixS/N=1.741.601.591.191.151.15backgroundsignalKs0S*S/N = 260364S=226385S/N=S*S/N=15235.9S/N=S=9533S*S/N=260288S/N=S=226329S*S/N=15232.5S/N=S=9515S*S/N=149771S/N=S=126290S*S/N=11665.7S=6714

  • Pt cut0
  • Pt dependence of S/N(ITS && TPC) or TOFPt (GeV/c)Pt (GeV/c)ITS or TPC or TOFITS or TPC or TOFmixS/NS/NTOFITS,TPCKs0TOFITS,TPCS/Nits S/Ntpc PID capability of ITS and TPCis certain

  • SummaryParticle identification of ALICE central detector (ITS,TPC,TOF) using simulation data S/N, S*S/N from and Ks0 mass spectrum

    S/N show good PID capability of ITS and TPCS*S/N show miss ID particle can be ignoredALICE will be able to Identified rare particle, D,B,J/,with help of vertex detector and PID detector