Heavy IonPhysics with the CMS experiment具有CMS实验重离子物理.pptVIP

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Heavy IonPhysics with the CMS experiment具有CMS实验重离子物理.ppt

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Heavy IonPhysics with the CMS experiment具有CMS实验重离子物理

July 23, 2005 EPS 2005/Lisboa Christof Roland June 27, 2002 Heavy Ion Physics at the LHC Pb+Pb Collisions at ?sNN ~ 5.5TeV Large Cross section for Hard Probes High luminosity 1027/cm2s Copious production of high pT particles Nuclear modification factors RAA out to very high pT Large cross section for J/ψ and ? family production sccLHC ~ 10x sccRHIC sbbLHC ~ 100x sbbRHIC Different “melting” for members of ? family with temperature Large jet cross section Jets directly identifiable Study in medium modifications Kinematics at the LHC The Detectors TheEnvironment A typical central Pb+Pb collision… …as seen by the CMS tracker. CMS Tracking Performance Specialized HI tracking Algorithm Seed Tracks in the Pixel system, 3 Layers 1-2% occupancy Use Kalman Filter to propagate tracks 10 Layers of SiStrip Tracker Occupancy up to 50% Includes 4 Stereo Layers = 2 hits Track Selection to reject fakes pT 1 GeV/c nhit 12 (out of 17) p(??) 0.01 DCA 3? ATLAS Tracking Performance CMS and ATLAS Calorimetry Hermeticity, Resolution, Granularity Central region Dh~5 equipped with tracker, electromagnetic and hadronic calorimeters and muon detector Forward coverage Calorimetric coverage of Dh~10 Additional calorimeters proposed to extend the coverage CMS: CASTOR (Dh~14) ATLAS: LUCID (Dh~12) Zero Degree Calorimeter (ZDC) Fast Readout for trigger Muon Reconstruction Tag from Muon chambers Momentum resolution from Silicon Tracker Calo + Magnet Iron absorb hadrons Barrel: pTmuon 3.5GeV/c Endcap: pLmuon 4 GeV/c Excellent mass resolution for J/y and U states Coverage in the central rapidity region, |?|2.5 Reconstruct Z boson Upsilon Mass Resolution Mass Resolution: Barrel: 53 MeV/c2 Endcap: 90 MeV/c2 Mass Resolution: Barrel: 123 MeV/c2 Endcap: 159 MeV/c2 Data Acquisition and Trigger CMS under construction ATLAS Bulk Properties: Multiplicity Bulk Properties: Multiplicity Bulk Properties: Elliptic Flow Bulk Propertie