1 / 30

Perspectives de physique avec les saveurs lourdes avec le d é tecteur ALICE

Perspectives de physique avec les saveurs lourdes avec le d é tecteur ALICE. Premi è res journ é es QGP-France Gin é s MARTINEZ GARCIA, Subatech for the ALICE collaboration Etretat, July 5th 2006. Physics Motivations.

trish
Download Presentation

Perspectives de physique avec les saveurs lourdes avec le d é tecteur ALICE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Perspectives de physique avec les saveurs lourdes avec le détecteur ALICE Premières journées QGP-France Ginés MARTINEZ GARCIA, Subatech for the ALICE collaboration Etretat, July 5th 2006

  2. Physics Motivations • Energy loss of Heavy Quarks (HQ) in hot and high density medium formed in AA central collisions. • Brownian motion and coalescence of low pT HQ in the quark gluon plasma (QGP). • Dissociation (and regeneration) of quarkonia in hot QGP. • Heavy flavour physics in pp collisions: small x physics, pQCD, HQ fragmentation functions, gluon shadowing, Quarkonia production mechanism. Premières journées QGP-France

  3. Heavy Quarks in AA coll. • Small xBj (10-3 –10-5) • DtQ ~ 0.04 –0.15 fm/c • DtQ << tQGP << tQ • Shadowing / Saturation • HQ energy loss in QGP • HQ coalescence (low pT) L.O. Premières journées QGP-France

  4. Melting of Y’ and c at SPS and RHIC, and melting of J/Y at LHC? Magic cancellation between J/Y suppression and J/Y regeneration? PLB571 36 (2003) Charmonia in AA collisions SPS RHIC LHC J/Y regeneration J/Y melting H. Satz, CERN Heavy Ion Forum, 09/06/05 22 (39)% of J/Y (Y’) from open beauty meson decays. Premières journées QGP-France

  5. PRD64,094015 cb(1P) cb(2P) (3S) (2S) (1S) SPS RHIC LHC Bottomonia in AA collisions CUSB Detector(Cornell) • First measurement of Bottomonia. • Regeneration is expected to be small at LHC. • (2S) behaves as J/y : TD(2S) ~ TDJ/y • (1S) melts only at LHC. • (2S)/(1S) as a function of pT. Dm(3S-2S) = 332 MeV/c2 45 (30)% of feed-down from higher resonances for (1S) ((2S)) Premières journées QGP-France

  6. ALICE capabilities • ALICE combines electronic, muonic and hadronic channels • ALICE covers down to pT ~ 0 for quarkonia and open charm • ALICE covers central (|h|<0.9) and forward (2.5<h<4.0) regions • High precision vertexing in the central barrel Premières journées QGP-France

  7. Physics Analysis • Hadronic decays: • D0K p, D+-K p p, DsK K*, Dsfp, … • Leptonic decays: • B l (e or m) + anything. • Invariant mass analysis of lepton pairs: BB, DD, BDsame, J/Y, Y’,  family, B J/Y + anything. • BB m m m (J/Ym). • e-m correlations. • W+-  l+-n, Z0l+l-. In red channels studied in the ALICE PPR Vol.2 (to be published in J.Phys. G) In black under study Premières journées QGP-France

  8. 1<pT<2 GeV/c D0Kp channel • High precision vertexing, better than 100 mm (ITS) • High precision tracking (ITS+TPC) • K and/or p identification (TOF) 109 pp 108 pPb 107 PbPb 107 central PbPb D Kp Premières journées QGP-France

  9. High Precision charm measurement pp at 14 TeV Sensitivity to PDF’s Central PbPb Shadowing + kT + energy loss Shadowing region Premières journées QGP-France

  10. Open Beauty from single electrons • Electron Identification (TRD+TPC) • High precision vertexing (ITS) • Subtraction of the open charm contribution. 107 central PbPb Premières journées QGP-France

  11. high mass mm low mass mm m+m- correlations Single Muons BDsame BB 5% central PbPb Premières journées QGP-France

  12. Energy loss physics Charm Production: Quark versus gluon Energy Loss Higher gluon coupling Beauty production: Mass dependence of Energy Loss Dead cone effect Premières journées QGP-France

  13. Quarkonia  e+e-,m+m- PbPb cent, 0 fm<b<3 fm Yields for baseline • (1S) & (2S) : 0-8 GeV/c • J/Y high statistics: 0-20 GeV/c • Y’ poor significance • ’’ ok, but 2-3 run will be needed. Premières journées QGP-France

  14. Suppression scenario • Suppression-1 • Tc =270 MeV • TD/Tc=1.7 for J/Y • TD/Tc= 4.0 for . • Suppression-2 • Tc=190 MeV • TD/Tc=1.21 for J/Y • TD/Tc= 2.9 for . PRC72 034906(2005) Hep-ph/0507084(2005) Good sensitivity J/Y, (1S) & (2S) Premières journées QGP-France

  15. Under-progress • Measurement of D+=>K-p+p+; • Electron-muon coincidences; • Polarization of the J/Y; • Measurement of beauty J/Y; • Measurement of beauty via tri-muon events; • Measurement of charm in the muon spectrometer; • Measurement of electro-weak bosons; Premières journées QGP-France

  16. D+ => K-p+p+ • Low pT under study • Rebinning • Additional cuts Significance Analysis feasible also without PID, but more time consuming pT integrated results Elena BRUNA et Francesco PRINO, Torino Premières journées QGP-France

  17. J/Y polarization 1< pT < 4 GeV/c pT > 7 GeV/c 4 < pT < 7 GeV/c Enrico SCOMPARIN et Roberta ARNALDI Torino Premières journées QGP-France

  18. Electro-weak bosons • W+-=>m+- + n • Z0 =>m+ + m- • Cross-checking efficiency, resolution and integrated luminosity; • (Unique) shadowing measurements; • Reference for high pT muon suppression. sres/MZ0 = 2% sint/MZ0 = 1.2% Zaida CONESA DEL VALLE, Nantes Premières journées QGP-France

  19. Running conditions Proton proton nominal run Lead-lead nominal run Ldt dt = 3.1030 cm-2 s-1 x 107 s 5.1037 cm-2 for pp run, 14 TeV Npp collisions = 2 .1012 collisions Ldt = 5.1026 cm-2 s-1 x 106 s 5.1032 cm-2 PbPb run, 5.5 TeV NPbPb collisions = 2 .109 collisions   Muon triggers: ~ 100% efficiency, < 1kHz Muon triggers: ~ 100% efficiency, ~ 1kHz Electron triggers: ~ 50% efficiency of TRD L1 20 physics events per event Electron triggers: Bandwidth limitation NPbPb central = 2 .108 collisions Hadron triggers: Npp minb = 2 .109 collisions Hadron triggers: NPbPb central = 2 .107 collisions   Premières journées QGP-France

  20. 1st day physics scenario • Ldt dt = 1030 cm-2 s-1 x 7.2x105 s • 7.2x1035 cm-2(0.72 pb-1) for pp run at 14TeV • Npp collisions = 5x1010 collisions • Enough for doing Heavy Flavours and electro-weak physics • Spring 2008 • First pp collisions at 0.9 TeV end of 2007 Premières journées QGP-France

  21. Conclusions • D meson physics can be done in the central barrel; • Beauty physics can be done via single electron (|y|<0.9) and muon (-4.<y<-2.5) measurements, and dimuon continuum; • Quarkonia physics can be done via dielectron and dimuon. Quarkonia polarization can be measured; • Beauty J/Y can be studied via di-electrons and tri-muons; • Electro-weak physics (in a unexplored y domain) via muon and dimuons for detector QA, shadowing and baseline. • Intermediate rapidity studies (–2.5<y<-0.9) via electron-muon correlation studies. Premières journées QGP-France

  22. But we can’t do • Open B meson measurements; • Heavy flavored baryon studies; • c quarkonia resonances; • J/Y dimuons from beauty decays; • Bottom-charmed mesons; • Higgs measurement in PbPb collisions; • ……… It’s time to think about future ALICE upgrades Premières journées QGP-France

  23. Slides for questions Premières journées QGP-France

  24. Quarkonia Acceptances J/Y J/Y Di-electron channel |h|<0.9 2.5<h<4.0   Di-muon channel |h|<0.9 2.5<h<4.0 Premières journées QGP-France

  25. m+m- Minv in pp @ 14 TeV Premières journées QGP-France

  26. e+e- Invariant Masses Premières journées QGP-France

  27. Charmonia spectroscopy J/Ym+m-, e+e- (BR 5.9%) y(2S) or y' pp @ 14 TeV sJ/y ~ 70 mb ~1 J/y per 1000 pp collisions 27% from cc decay 22% from B decay 5.6% from y(2S) y(2S) m+m-, e+e-(BR~0.8%) 60% direct y(2S) 39% from B decay  J/y y(2S) / J/Y direct ~ 1.7% y(2S) / J/y from B ~ 5.2%  Premières journées QGP-France

  28. Bottomonia spectroscopy (1S)m+m-, e+e- (BR 2.4%) pp @ 14 TeV s(1S) ~ 0.77 mb ~1 (1S) per 105 pp collisions (3S) 29.0% from cb(1P) decay 9.5% from (2S) decay 4.5% from cb(2P) decay 1.5% from (3S) decay (2S) (2S) m+m-, e+e- (BR 1.3%) 25.0% from cb(2P) decay 4.5% from (3S) decay (3S) m+m-, e+e- (BR 1.8%)  (1S) Dm(3S-2S) = 332 MeV/c2 Premières journées QGP-France

  29. Acceptances ATLAS & CMS present a large lepton acceptance |h|<2.4 ALICE combines muonic and electronic channels ALICE covers the low pT region ( pT=0 for quarkonia) ALICE covers the forward region 2.5<h<4.0 ATLAS, CMS & ALICE-electron with high precision vertexing Premières journées QGP-France

  30. Phenix Factor T. Frawley Premières journées QGP-France

More Related