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High-density QCD with CMS at the LHC

High-density QCD with CMS at the LHC. Haidong Liu for the CMS Collaboration. OutLine Detectors Overview Bulk Observables Hard Probes Summary. CMS Detectors. Tracking in Si Pixels and low p T PID in Pb+Pb 5.5 TeV collisions. J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455.

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High-density QCD with CMS at the LHC

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  1. High-density QCD with CMS at the LHC Haidong Liu for the CMS Collaboration • OutLine • Detectors Overview • Bulk Observables • Hard Probes • Summary

  2. CMS Detectors Haidong Liu (UCD) / DNP2008

  3. Tracking in Si Pixels and low pT PID in Pb+Pb 5.5 TeV collisions J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 Reconstructed hits in the Si pixel tracker Haidong Liu (UCD) / DNP2008

  4. Low pT PID spectra for Pb+Pb @ 5.5 TeV Efficiency |η|<1 Acceptance |η|<1 pt pT resolution |η|<1 pT_reco/pT_sim |η|<1 J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 Haidong Liu (UCD) / DNP2008

  5. Event plane resolution will the v2 reach the hydro limit? b=9fm of Pb+Pb collisions -- the expected resolution is 0.37 rad with ECAL NA49 Phys. Rev. C 68 034903 PHOBOS nucl-ex/0610037 PHOBOS Nucl. Phys. A 774 523–26 STAR AIP Conf. Proc. 870 691–4 Voloshin S A and Poskanzer A M Phys. Lett. B 474 27–32 Kolb P F, Sollfrank J and Heinz U W ,Phys. Rev. C 62 054909 Teaney D, Lauret J and Shuryak E V nucl-th/0110037 Φsimu-Φreco J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 Haidong Liu (UCD) / DNP2008

  6. Hard probe triggering HLT significantly enhanced statistics for hard processes J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 Haidong Liu (UCD) / DNP2008

  7. Jets and high pT spectra Jet ET Resolution [%] J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 Leading jet ET distribution in one month data ET threshold 50, 75, 100 GeV Charged particle spectra and RAA Very small errors below 200 GeV Expected reach (0.5 nb-1): pT~300 GeV/c (inclusive hadrons) pT~500 GeV/c (jets) Haidong Liu (UCD) / DNP2008

  8. Expected quarkonia signalsin one month data (di-muon) J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 dN/dη|η=0=5000 Both μ |η|<2.4 Assuming no quarkonia suppression Acceptance dN/dη|η=0=2500 Both μ |η|<0.8 Solid line: Both μ |η|<2.4 dashed line: Both μ |η|<0.8 Expected stats (0.5 nb-1): ~1.8e+5 (J/Psi) & ~2.5e+4 (Upsilon) Haidong Liu (UCD) / DNP2008

  9. Z0 signals Expected stats (0.5 nb-1): ~11000 (Z-->μμ) ~1000 (Z-jet with pT>25 GeV/c) J. Phys. G: Nucl. Part. Phys. 34 (2007) 2307-2455 Haidong Liu (UCD) / DNP2008

  10. Photon tagged jets CMS NOTE HIN-07-002 Quenched FF Unquenched FF models used in this analysis PYQUEN: selected QCD channels w/ jet quenching PYTHIA: selected QCD channels w/o jet quenching HYDJET: underlying corresponding Pb+Pb events Isolated photon + away side jet Ratio of quenched and unquenched FF Detailed quantitative studies of medium-induced parton energy-loss possible. Haidong Liu (UCD) / DNP2008

  11. Summary • CMS detector has • High-resolution trackers, calorimeters and muon chambers • Large acceptance • This makes CMS an ideal experiment to measure various hard probes in Pb+Pb at 5.5 TeV and a competitive machine for soft properties study at the LHC Thanks! Haidong Liu (UCD) / DNP2008

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