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Charm and Beauty in ALICE for CERN Yellow Report “Hard Probes in Heavy Ion Collisions at LHC”

Charm and Beauty in ALICE for CERN Yellow Report “Hard Probes in Heavy Ion Collisions at LHC”. Conveners: Philippe Crochet Andrea Dainese Ermanno Vercellin. Section Outline. INTRODUCTION ALICE DETECTOR MUONS: Quarkonia D and B mesons ELECTRONS: Quarkonia D and B mesons

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Charm and Beauty in ALICE for CERN Yellow Report “Hard Probes in Heavy Ion Collisions at LHC”

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  1. Charm and Beauty in ALICEforCERN Yellow Report“Hard Probes in Heavy Ion Collisions at LHC” Conveners: Philippe Crochet Andrea Dainese Ermanno Vercellin PPR Meeting - February 7, 2003 Andrea Dainese

  2. Section Outline • INTRODUCTION • ALICE DETECTOR • MUONS: • Quarkonia • D and B mesons • ELECTRONS: • Quarkonia • D and B mesons • ELECTRON-MUON COINCIDENCES • HADRONS • PROTON-NUCLEUS • SUMMARY PPR Meeting - February 7, 2003 Andrea Dainese

  3. Introduction • Motivations for Quarkonia studies at LHC • charmonium study from SPS to RHIC to LHC • stress on s as uniqueness of ALICE @ LHC • Motivations for open c and b • thermal charm? parton energy loss? • present experimental picture • uniqueness of ALICE: detectors dedicated to displaced vertices ID, exclusive reconstruction of D mesons down to pT ~ 1 GeV/c PPR Meeting - February 7, 2003 Andrea Dainese

  4. ALICE Detector • This you know… • Stress on the request for high level reconstruction and PID performances up to dNch/dy = 8000 PPR Meeting - February 7, 2003 Andrea Dainese

  5. Muons: Quarkonia (I) • Acceptance for J/ () (w/o and w/ 1 (2) GeV/c cut on m pT) J/Y  PPR Meeting - February 7, 2003 Andrea Dainese

  6. Muons: Quarkonia (II) • Mass resolutions: from MUON TDR • Significances (MUON TDR): PPR Meeting - February 7, 2003 Andrea Dainese

  7. Muons: D and B • Strategy for unlike-sign dimuon invariant mass analysis to extract B mesons yield from: • high inv. mass region (6 – 9 GeV/c): B m B m • low inv. mass region (1 – 3 GeV/c): B  D m B  D m • Possibility of like-sign dimuon analysis exploiting B mesons oscillations PPR Meeting - February 7, 2003 Andrea Dainese

  8. Electrons: Quarkonia • Acceptance for J/ () (w/o and w/ 3 GeV/c cut on e pT = effect of TRD L1 trigger) J/Y  expected mass resolution for  @ B = 0.4T: 100 MeV PPR Meeting - February 7, 2003 Andrea Dainese

  9. Electrons: B mesons (I) • Short description and results of full simulation feasibility study for B  e + X in Pb-Pb • Electron identification in TRD-TPC (pT > 1 GeV/c) • electron contamination: 1/100 in TRD, 1/100 in TPC (dE/dx) • B electron identification: • cut on pT : reject low pT backgrounds (conversions, dalitz of light mesons) • cut on impact parameter: reject background from D mesons PPR Meeting - February 7, 2003 Andrea Dainese

  10. Electrons: B mesons (II) S/(S+B) S per 107 Pb-Pb events pT > 2 GeV/c, d0 > 180 mm: 80000 electrons with S/(S+B) = 90 % PPR Meeting - February 7, 2003 Andrea Dainese

  11. Electrons: B from displaced J/Y • B  J/Y e+e- PPR Meeting - February 7, 2003 Andrea Dainese

  12. e-m coincidences • Strategy for detection of DD, BB pairs from coincidences of e in ITS-TPC-TRD and m in MUON PPR Meeting - February 7, 2003 Andrea Dainese

  13. Hadrons: D0 K-p + (I) • Full simulation feasibility study in Pb-Pb and pp Kp inv. mass in Pb-Pb significance = 37 PPR Meeting - February 7, 2003 Andrea Dainese

  14. Hadrons: D0 K-p + (II) Pb-Pb down to ~ 1 GeV/c pp down to ~ 0 GeV/c PPR Meeting - February 7, 2003 Andrea Dainese

  15. pA • Motivations: • measure charmonium “normal nuclear absorption” • measure shadowing to “understand” heavy flavours cross-section in Pb-Pb • study parton energy loss in cold nuclear medium • ALICE strongly committed to pA • Outline of pA runs in LHC “schedule” • Performances: • under study • expected performance for exclusive D meson reconstruction: close to what achieved in pp, since dNch/dy will not be “much larger” in p-Pb than in pp [it’ll be much closer to that of pp than to that of Pb-Pb] PPR Meeting - February 7, 2003 Andrea Dainese

  16. Summary ALICE’s excellent reconstruction and PID performances will allow to study: • the complete spectrum of heavy quarkonia • D and B mesons in many inclusive channels • D mesons in the exclusive hadronic channel down to pT ~ 1 GeV/c PPR Meeting - February 7, 2003 Andrea Dainese

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