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What is the LHC The LHC heavy ion programs Selected physics channels Heavy flavors & the LHC.

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Presentation on theme: "What is the LHC The LHC heavy ion programs Selected physics channels Heavy flavors & the LHC."— Presentation transcript:

1 Philippe.Crochet@clermont.in2p3.fr What is different @ the LHC The LHC heavy ion programs Selected physics channels Heavy flavors & quarkonia @ the LHC Philippe.Crochet@clermont.in2p3.fr

2 Heavy flavors @ LHC (in short) large primary production melting of  (1S) by color screening large secondary production of charmonia new environment, new observables, new analyses central AA

3 Philippe.Crochet@clermont.in2p3.fr Hard gluon induced quarkonium breakup quarkonium survival probabilities versus QGP lifetime set(i)(ii) : lower (higher) bottomonium (charmonium) binding energy X.-M.Xu, D.Kharzeev, H.Satz, X.-N.Wang, Phys. Rev. C 53(1996)3051 M.Bedjidian et al., hep-ph/0311048, D.Blaschke et al., hep/ph-0410338 none of the J/  survives the LHC-(PbPb)QGP! (importance of p t & system size studies)  probes the QGP lifetime & temperature RHIC LHC J/  

4 Philippe.Crochet@clermont.in2p3.fr Secondary quarkonium production from kinetic recombination & statistical hadronization a (very) large J/  production is to be expected w.r.t. RHIC what about  ? : a b quark @ LHC is a c quark @ RHIC! J/  kinetic recombination @ LHCJ/  stat. hadronization @ LHC P.Braun-Munzinger, J.Stachel, Phys. Lett. B 490(2000)196 R.L.Thews, M.Schroeder, J.Rafelski, Phys. Rev. C 63(2001)054905

5 Philippe.Crochet@clermont.in2p3.fr dimuon in ALICE, p  t > 2 GeV/c unlike-sign total unlike-sign from bottom unlike-sign from charm like-sign from bottom The dilepton mass spectrum @ LHC dilepton from b decay dominate the spectrum below  & J/  large yield of secondary J/  from b decay dilepton from b decay have different origin at low & high mass sizeable yield of like-sign correlated dilepton from b decay Drell-Yan is probably out of reach (need of new normalisations) S.Grigoryan

6 Philippe.Crochet@clermont.in2p3.fr Heavy flavor physics program @ LHC (channels investigated so far) charmonia & bottomonia versus centrality transverse momentum system-size reaction plane open bottom (inclusive) cross-section from 2 nd J/ , single leptons & dilepton b quark energy loss open charm (exclusive D 0 ) transverse momentum distribution c quark energy loss electron-muon coincidences

7 Philippe.Crochet@clermont.in2p3.fr ATLAS: heavy ion LOI (2004) Heavy ions @ the LHC CMS: strong heavy ion program ALICE: the dedicated heavy ion experiment one LHC year = 1 month AA (or AA-like) + 10 months pp

8 Philippe.Crochet@clermont.in2p3.fr ALICE (A Large Ion Collider Experiment): 7(4) SPS(RHIC) experiments ITS TPC FMD PHOS ABSORBER MUON TRACKING CHAMBERS MUON FILTER DIPOLE MAGNETTOF TRD HMPID L3 MAGNET PMD MUON TRIGGER CHAMBERS 1000 members 80 instituts 30 countries Philippe.Crochet@clermont.in2p3.fr

9 Heavy flavors with ALICE (di-)muons: J/ ,  ’, ,  ’,  ’’, open charm, open bottom (di-)electrons: J/ ,  ’, ,  ’,  ’’, open charm, open bottom hadrons: exclusive D 0 electron-muon coincidences: open charm & bottom Philippe.Crochet@clermont.in2p3.fr

10 Heavy flavors with CMS muon spectrometer & silicon tracker in central barrel & end-caps large acceptance, excellent resolution J/ ,  ’, ,  ’,  ’’, open charm, open bottom, Z 0

11 Philippe.Crochet@clermont.in2p3.fr Heavy flavors with ATLAS muon spectrometer & silicon tracker in central barrel & end-caps large acceptance studies limited to ,  ’,  ’’ reconstruction & b-jet tagging so far

12 Philippe.Crochet@clermont.in2p3.fr cross-sections from R.Vogt in hep-ph/0311048, assumes neither suppression nor enhancement J/  : large stat., good sign. (allows much narrower centrality bins)  ’: small S/B  : good stat., S/B > 1, good sign.  ’: good stat., S/B > 1, good sign.  ’’: low statistics Centrality dependence of quarkonium yields in ALICE-muon S.Grigoryan

13 Philippe.Crochet@clermont.in2p3.fr  ’/  ratio versus p t (dimuon channel) E.Dumonteil, PhD Thesis (2004) Melting depends on resonance formation time, dissociation temp. & p t QGP temp., lifetime & size Ratio is flat in pp (CDF) Any deviation from the pp (pA) value is a clear evidence for the QGP (nuclear effects cancel-out) The p t dependence of the ratio is sensitive to the characteristics of the QGP J.P.Blaizot & J.Y.Ollitrault, Phys. Lett. B 199(1987)499; F.Karsch & H.Satz, Z. Phys. C 51(1991)209; J.F.Gunion & R.Vogt, Nucl. Phys. B 492(1997)301 full & realistic simulation error bars = 1 month of central PbPb (10%)

14 Philippe.Crochet@clermont.in2p3.fr Bottom from single electrons with displaced vertices PbPb central (5%) B  e  in ITS/TPC/TRD p t > 2 GeV/c, 180 < d0 < 600  m 50000 e  from B, S/(S+B) = 90% d0 < d0cut : improve S/B for resonances d0 > d0cut : measure electrons from D & B CERN/LHCC 99-13, M.Lunardon & R.Turrisi

15 Philippe.Crochet@clermont.in2p3.fr Secondary J/  from B decay ALICE: CERN/LHCC 99-13, CMS: CMS/NOTE 2001/008 disentangle primary & secondary J/  measure inclusive b cross-section probe b quark in-medium energy loss B  J/  (1S) anything : 1.16  0.10% (PDG) N(direct J/  ) in central (5%) PbPb @ 5.5 TeV : 0.18 N(bb pairs) in central (5%) PbPb @ 5.5 TeV : 4.56  N(b  J/  ) / N(direct J/  ) = 30% in 4 

16 Philippe.Crochet@clermont.in2p3.fr Using secondary J/  from B decay to probe b quark energy loss energy loss is modeled in 2 extreme cases: collisional energy loss (minimum) collisional + radiative energy loss (maximum) with energy loss: yield reduced by a factor ~ 4  distribution gets significantly narrower secondary J/  from B decay in CMS, p t  > 5 GeV/c I.P.Lokhtin & A.M.Snigirev, Eur. Phys. J. C 21(2001)155 interest to combine this study with dimuon from B

17 Philippe.Crochet@clermont.in2p3.fr dimuon events: 85% of direct J/  15% of J/  from b decay tri-muon events: 15% of direct J/  85% of J/  from b decay Secondary J/  from tri-muon events in pp w/o 2 nd vertex reconstruction dimuon evts in pp, p  t > 1GeV/c b-chain S/B = 3 S/√S+B = 80 tri-muon evts in pp, p  t > 1GeV/c correlated muons correlated muons from b uncorrelated muons A.Morsch (2004) doable in pp & pA, very difficult in central ArAr

18 Philippe.Crochet@clermont.in2p3.fr b cross-section from single muons & unlike-sign dimuon in PbPb fits with fixed shapes (PYTHIA) & b yield as the only free parameter (central PbPb 5%) allows to reconstruct the differential b x-section uses 3 different channels systematical errors underway (very) large statistics is expected R.Guernane (2004) single muons dimuon @ low mass dimuon @ high mass input distribution

19 Philippe.Crochet@clermont.in2p3.fr central PbPb Exclusive charm measurements accessible p t range down to 1(0) GeV/c in PbPb(pp) background assumes dN/d  = 6000 @  = 0 in PbPb allows to measure B  D 0   K à la CDF promising tool to study c quark energy loss (U.Wiedemann talk), sensitivity to gluon density (M.Djordjevic talk) SS/B (%) S/  S+B PbPb 5%130001137 pp190001144 A.Dainese, nucl-ex/0311004 D 0  K  (3.8%) 1 LHC year, 1  mass cut

20 Philippe.Crochet@clermont.in2p3.fr Using D 0 to probe c quark energy loss A.Dainese, nucl-ex/0312005, 0405008 R D AA sensitive to shadowing for p t 7GeV/c R D AA behaves differently versus p t with and w/o dead cone R D/h has small systematic uncertainties (double ratio) R D/h > 1 evidences the dead cone to some extent (see U.Wiedemann talk) energy loss modeled with quenching weights with and w/o dead cone

21 Philippe.Crochet@clermont.in2p3.fr Electron-muon coincidences clean signal covers intermediate rapidities measurement done in pp @ ISR (1979!) chalenging in heavy ion collisions ALICE-INT-2000-01

22 Philippe.Crochet@clermont.in2p3.fr Summary heavy quarks will be copiously produced in HIC @ LHC this will provide a very rich physics program with new observables & new types of analyses first data in summer 2007 Philippe.Crochet@clermont.in2p3.fr

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