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Nu Xu1/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Energy Dependence of the High Moments from Transport Model Simulations Xiaofeng Luo.

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Presentation on theme: "Nu Xu1/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Energy Dependence of the High Moments from Transport Model Simulations Xiaofeng Luo."— Presentation transcript:

1 Nu Xu1/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Energy Dependence of the High Moments from Transport Model Simulations Xiaofeng Luo (1), Bedanga Mohanty (2), and Nu Xu (1,3) (1) College of Physical Science & Technology, Central China Normal University, Wuhan, 430079, China (2) School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar, 751005, India (3) Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

2 Nu Xu2/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Beam Energy Scan at RHIC Observations: (1) Azimuthally HBT 1st order phase transition (2) Directed flow v 1 1st order phase transition (3) Dynamical correlations partonic vs. hadronic dof (4) v 2 - NCQ scaling partonic vs. hadronic dof (5) Fluctuations Critical point, correl. length - http://drupal.star.bnl.gov/STAR/starnotes /public/sn0493 - arXiv:1007.2613 Study QCD Phase Structure - Signals of phase boundary - Signals for critical point

3 Nu Xu3/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 2 T E RHIC, SPS, FAIR 3 3 Phase boundary RHIC, FAIR, NICA Exploring the QCD Phase Structure 1 1 T ini, T C LHC, RHIC 2 Partonic Matter Hadronic Matter

4 Nu Xu4/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Previous Summary 1) sQGP formed at RHIC/LHC: - Collectivity: NCQ scaling in v 2, … - Jet-quenching, Quarkonia, direct photon, … 2)BES-I Program: - Partonic QGP dominant: √s NN > 39 GeV Hadronic interactions become dominant: √s NN ≤ 11.5 GeV What is the structure of QCD phase diagram? - phase boundary? - QCD critical point?

5 Nu Xu5/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Susceptibilities and Moments Thermodynamic function: The susceptibility: Thermodynamic function  Susceptibility  Moments Model calculations, e.g. LGT, HRG  Measurements Conserved Quantum Number

6 Nu Xu6/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Higher Moment: Net-charge STAR Preliminary 1)Preliminary net-charge results: efficiency, decay, … effects under study 1)Higher statistics data needed below 20 GeV - HRG Model: K. Redlich et al, private communications STAR: D. McDonald, QM2012

7 Nu Xu7/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 STAR net-proton results: 1)All data show deviations below Poisson beyond statistical and systematic errors in the 0-5% most central collisions for κσ 2 and Sσ at all energies. 2)UrQMD model show monotonic behavior 3)Higher statistics needed for collisions at √s NN < 20 GeV Net-proton Higher Moments STAR Preliminary STAR: X.F. Luo, QM2012

8 Nu Xu8/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Open Issues 1)Effects of conservations, in this case, the baryon conservation. 2)Effects of the resonance decays 3)Effects of the kinematic cuts 4)Net-proton vs. net-Baryon 5)Effect of PID … 1)Effects of conservations, in this case, the baryon conservation. 2)Effects of the resonance decays 3)Effects of the kinematic cuts 4)Net-proton vs. net-Baryon 5)Effect of PID … Transport Model: 1) AMPT: http://arxiv.org/abs/nucl-th/0411110 - partonic mode - hadronic mode 2) UrQMD: http://urqmd.org/ http://urqmd.org/ - hadronic mode - Obey most conservation laws - Most hadronic observables are consistent with data - No phase transition, nor critical point in the model calculations Transport Model: 1) AMPT: http://arxiv.org/abs/nucl-th/0411110 - partonic mode - hadronic mode 2) UrQMD: http://urqmd.org/ http://urqmd.org/ - hadronic mode - Obey most conservation laws - Most hadronic observables are consistent with data - No phase transition, nor critical point in the model calculations

9 Nu Xu9/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 URQMD Net-protonNet-baryon 1)Simulations are done with the same experimental cuts 2)For κ*σ 2 net-p and net-B behavior similarly: a) peripheral centrality bins, values are above unity b) at most central collisions, the value below at lower beam energy

10 Nu Xu10/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 AMPT (string melt) Net-protonNet-baryon 1)Simulations are done with the same experimental cuts 2)For κ*σ 2 net-p and net-B behavior similarly: a) peripheral centrality bins, values are above unity b) at most central collisions, the value below at lower beam energy

11 Nu Xu11/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 Summary and Outlook 1)Transport model results for net-proton are consistent with experimental observations 2)In these simulations, no significant difference between net-p and net-B 3)At lower beam energies, baryon conservation pushes the value of κ*σ 2 below unity Outlook: RHIC BES-II is needed in order to collect sufficient data for collisions at √s NN < 20 GeV RHIC provides unique opportunities for exploring matter with QCD degrees of freedom!

12 Nu Xu12/12 ”DNP“, Newport Beach, California, December 24 - 27, 2012 2 T E RHIC, SPS, FAIR 3 3 Phase boundary RHIC, FAIR, NICA Exploring the QCD Phase Structure 1 1 T ini, T C LHC, RHIC 2 Partonic Matter Hadronic Matter RHIC Top Energy Study QGP Properties - heavy flavor hadrons - di-leptons - Jets RHIC Top Energy Study QGP Properties - heavy flavor hadrons - di-leptons - Jets BES-II Map the QCD Phase Structure HI collisions at √s NN ≤ 20 GeV BES-II Map the QCD Phase Structure HI collisions at √s NN ≤ 20 GeV

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