Nu XuDirector’s Review, LBNL, May 17, 20061/23 Future Program for Studying Bulk Properties in High-Energy Nuclear Collisions Nu Xu.

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Presentation transcript:

Nu XuDirector’s Review, LBNL, May 17, 20061/23 Future Program for Studying Bulk Properties in High-Energy Nuclear Collisions Nu Xu

Nu XuDirector’s Review, LBNL, May 17, 20062/23 Outline  What we have learned at 200GeV  Baryon-rich physics - search for phase boundary (hadronic shore)  Heavy flavor physics: STAR HFT - study the properties of the hot/dense medium (‘sQGP’) at RHIC

Nu XuDirector’s Review, LBNL, May 17, 20063/23 QCD Phase Diagram RHIC results show: 1) Jet-quenching - hot and dense matter 2) Strong elliptic flow v 2 - partonic collectivity 3) Hadron yields thermal - possible thermalization Next Step: (a) Phase boundary? (b) Thermalization? deep partonic ocean phase boundary?

Nu XuDirector’s Review, LBNL, May 17, 20064/23 Baryon-rich Physics: Search for the Hadronic Shore ( … )

Nu XuDirector’s Review, LBNL, May 17, 20065/23 QCD Phase Diagram Model predictions: 1) All ‘end points’ exist at  B > 0.1GeV 2) Most ‘end points’ exist at  B < 0.95GeV 3) Large uncertainties in the predictions. Data is important. M.A Stephanov, Prog. Theor. Phys. Suppl. 153, 139(2004); Int. J. Mod. Phys. A20, 4387(05); hep-ph/

Nu XuDirector’s Review, LBNL, May 17, 20066/23 Early SPS Results NA49 Experiment: (1) The “horn” structure in  K +  /  +  ratios observed (2) Increased fluctuation signal at lower beam energies C. Blume (NA49), hep-ph/ (3) Data suffer low statistics and large systematic uncertainties, due to acceptance and PID σ 2 dyn = σ 2 data – σ 2 mixed

Challenge: Changing Acceptance (NA49) 20 GeV: 40 GeV:160 GeV: Slide from Christof Roland, Correlations ‘05, MIT 6.27 GeV 8.77 GeV 17.3 GeV

Nu XuDirector’s Review, LBNL, May 17, 20068/23 RHIC Injection energy: 9.8 => 2.3 GeV The center of mass energy: GeV Low energy scan program: GeV

Nu XuDirector’s Review, LBNL, May 17, 20069/23 - Large acceptance: 2  coverage at mid-rapidity and low p T - Good PID: STAR MRPC ToF upgrade ready by FY2008 K,  ID up to p T ~ 1.8 GeV/c and proton ID up to p T ~ 4GeV/c The STAR Experiment STAR MRPC ToF:  =2  at mid-y Finish: 2008

Nu XuDirector’s Review, LBNL, May 17, /23 E c.m. BB BBC Coin Rate #of days/1M (1day=10 hr) #of events needed #of days of beam M M M M M > M > M1.5 This is our fishing net: if the fish is bigger than the hole we will catch it. Beam-time Estimation at STAR

Nu XuDirector’s Review, LBNL, May 17, /23 Heavy ion beams: /s 238 U 8.22 GeV // Ni 9.29 GeV The International Facility for Antiproton and Ion Research sis100/300 sis18 CBM

Nu XuDirector’s Review, LBNL, May 17, /23 1) Radiation hard Silicon (pixel/strip) Tracking System 2) Electron detectors: RICH + TRD + ECAL (hadron suppression >10 4 ) 3) Charged hadron id: TOF-RPC 4) Neutral particles ( , π, η) id: ECAL The Compressed Baryonic Matter (CBM) Experiment Silicon Tracking System (STS) Conceptual design

Nu XuDirector’s Review, LBNL, May 17, /23 Observables - Spectra, v 2, and HBT of , K, p, , , , , , D, J/  - Vector mesons: , a 1, , … - Fluctuations:  N(h ± ) ,  N(K)/N(  ) ,  p T ,  dy … - Beam energy: RHIC GeV, starts in 2008 FAIR GeV, starts in 2013 Step I: Disappearance of partonic activities Step II: Fluctuation and vector meson production Theoretical efforts, predictions, are essential!

Nu XuDirector’s Review, LBNL, May 17, /23 Studying ‘sQGP’ Properties at RHIC The STAR Heavy Flavor Program ( )

Nu XuDirector’s Review, LBNL, May 17, /23 Quark Mass 1)Higgs mass: electro-weak symmetry breaking (current quark mass). 2)Quark mass: Higgs + QCD (Chiral symmetry breaking) - constituent quark mass. éStrong interactions do not affect heavy-quark masses. éImportant tool for studying properties of the hot/dense medium at RHIC. éTest pQCD predictions at RHIC.

Nu XuDirector’s Review, LBNL, May 17, /23 Electrons: Mixture of c- & b- Dadrons M. Djordjevic, et. al. nucl-th/ Partonic energy loss - strongly interacting matter produced at RHIC! Energy loss mechanism: under study M. Gyulassy et al. Problem: isolation of Charm hadron contributions from Beauty-hadrons

Nu XuDirector’s Review, LBNL, May 17, /23 The Heavy Flavor Tracker 1) Precision tracking detector: ≤ 8  m resolution at vertex 2) Topologically reconstructing charm-hadrons 3) Analyze charm-hadron flow (v 2 ) and energy loss (R AA ) HFT: 2 layers of Si at mid-y Finish: 2010 STAR MRPC ToF:  =2  at mid-y Finish: 2008

Nu XuDirector’s Review, LBNL, May 17, /23 Open-charm Hadron Reconstructions 1) D 0, D s, D +,  c and their anti-particles can be reconstructed with the combination of the HFT+SSD+TOF+TPC. 2) Reasonable efficiencies at low p T - important for flow analysis.

Nu XuDirector’s Review, LBNL, May 17, /23 Rate Estimates - Spectra (a)dN/dp T distributions for D-mesons. The integrated yield dN/dy = 0.03 as measured in p + p collisions at 200 GeV ----Phys. Rev. Lett. 94, (2005) Scaled by = 950, corresponds to the top 10% central Au + Au collisions at RHIC. (b) D 0 rates from p+p and top 10% central Au + Au collisions at 200 GeV.

Nu XuDirector’s Review, LBNL, May 17, /23 Rate Estimates - v 2 (a)dN/dp T distributions for D-mesons. Scaled by = 290, corresponds to the minimum bias Au + Au collisions at RHIC. (b) Assumed v 2 distributions for D- mesons PLB 595, 202 (2004) Error bars shown are from 15% systematic errors (c) D 0 meson v 2 rates from minimum bias Au + Au collisions at 200 GeV. The small and large error bars are for 15% and 30% systematic errors, respectively. For the v 2 analysis, 12 bins in  are used.

Nu XuDirector’s Review, LBNL, May 17, /23 (1) Test pQCD properties in hot and dense medium - Charm- and Bottom-hadron spectra, R AA, Charm correlations - Sensitive and detailed study for partonic energy loss  `falsify pQCD, a la Miklos Gyulassy’ - Precision Charm cross section for J/  analysis - direct test de-confinement and Charm thermalization (2) Test light-flavor thermalization - Charm-hadron v 2 - partonic thermalization - Di-lepton invariant mass distributions -  c symmetry (3) Essential for spin heavy flavor physics Theoretical efforts, predictions, are essential! Summary II

Nu XuDirector’s Review, LBNL, May 17, /23 Columbus’ Discovery and RHIC RHIC’s future and two important unknowns: (1) Boundary of the phases and (2) Properties of the ‘sQGP’

Nu XuDirector’s Review, LBNL, May 17, /23 Nuclear phase diagram 1)RHIC heavy-flavor program: - Study medium properties at RHIC - pQCD in hot and dense environment 2)Baryon-rich physics: (RHIC BR & FAIR CBM) - Search for the possible phase boundary and the tri-critical point. - Chiral symmetry restoration Energy scan