1 / 21

Beam Energy Scan Program at RHIC

Beam Energy Scan Program at RHIC. STAR & PHENIX. Bedanga Mohanty NISER, Bhubaneswar. Outline: Motivation Experimental Results Phase – II of BES Program Summary. Motivation. NICA.

cecil
Download Presentation

Beam Energy Scan Program at RHIC

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. Beam Energy Scan Program at RHIC STAR & PHENIX Bedanga Mohanty NISER, Bhubaneswar Outline: Motivation Experimental Results Phase – II of BES Program Summary

  2. Motivation NICA Establish phase diagram of strongly interacting matter to the level of phase diagram of water (Electro-magnetic interactions)

  3. RHIC BES Varying beam energy in HI collisions varies Temperature and Baryon Chemical Potential Collider Au+Au 7.7 GeV Au+Au 200 GeV p p pT (GeV/c) p p Rapidity Motivation: Search for signals of phase boundary Search for signals for critical point P. Braun-Munzinger, J. Stachel Nature 448:302-309,2007

  4. Data Set

  5. Energy and Multiplicity Density Jeffery T. Mitchell, QM2012 A factor of ~ 4 variation in eBJ yet no significant change in centrality dependence of particle density at midrapidity

  6. Temperature and baryon density STAR Preliminary Lokesh Kumar, QM2012 Sabita Das, QM2012 0-5% centrality Temperature: 140 – 160 MeV and mB : 20 – 400 MeV Temperature dependence on baryon chemical potential

  7. QCD Phase Diagram - RHIC BES √sNN(GeV) T (MeV) 39 19.6 7.7 5 160 J. Randrup & J. Cleymans, Phys. Rev. C 74 (2006) 047901 140 120 100 112 206 420 585 0 mB (MeV) Region of high net-baryon density

  8. Partonic vs. Hadronic Interactions Daniel Cebra, QM2012 Shu Shi, QM2012 v2 STAR Preliminary STAR Preliminary mT- m (GeV/c2) Number of Constituent Quark scaling broken at/below 11.5 GeV

  9. Role of f-meson fN elastic scattering ~ 8 mb fM elastic scattering ~ 5 mb AMPT: PRC 72 (2005) 064901 Md. Nasim, BM, Nu Xu v2 f << v2 other hadrons  absence of partonic phase

  10. Partonic vs. Hadronic Interactions STAR Preliminary Xiaoping Zhang, QM2012 Strange baryon to meson ratio, falls off common trend  Dominance of hadronic interactions ?

  11. Partonic vs. Hadronic Interactions STAR Preliminary Gang Wang QM2012 Dynamical charge correlations vanishes at/below 11.5 GeV

  12. Partonic and Hadronic Interactions Xiaoping Zhang, QM2012 Lokesh Kumar, QM2012 Nuclear modification factor > unity at high pT at 11.5 GeV

  13. QCD Phase Diagram 200 39 62.4 11.5 7.7 “Scale of QCD phase diagram”Science, 332, 1525 (2011)

  14. Search For Critical Point and Order Of Phase Transition • Distributions become non Gaussian • Correlation length diverges • Susceptibilities diverges • Long wavelength fluctuations or low momentum fluctuations important T > TC T~TC T < TC Rapidity dependence of v1 L.P. Csernai, D. Rohrich PLB 458, 454 (1999). H. Stoecker, NP A750, 121 (2005). J. Brachmann et al., PRC 61, 24909 (2000).

  15. Search for signals of 1st order Phase transition YadavPandit, QM2012 Proton v1 slope changes sign versus rapidity Becomes positive below 11.5 GeV

  16. Net-proton number fluctuations Deviations from Poisson expectation observed for central collisions S  ~   XiaofengLuo, QM2012 Physical Review Letters 105 (2010) 022302

  17. Net-Charge Number Fluctuations Deviations from HRG expectation observed for central collisions D. Mishra, P. K. Netrakanti ..PHENIX Jeffery T. Mitchell, QM2012 STAR: D. MacDonald, N. Shaoo QM2012

  18. Beam Energy Scan Phase - II STAR BUR - 2013 Higher statistics data at lower beam energies + 15 GeV (2013) Fedotov, W. Fischer, private discussions, 2012.

  19. Beam Energy Scan Phase - II STAR BUR - 2013 1% Au target • Annular 1% gold target inside the STAR beam pipe • 2m away from the center of STAR • Data taking concurrently with collider mode at beginning of each fill mB reach extended to ~ 750 MeV

  20. Summary Wealth of information available from RHIC BES data √sNN(GeV) 39 19.6 7.7 5 2.5 Explore QCD Diagram BES phase-I BES phase-II Fixed Target Test Run QGP properties S. Gupta, QM2011 112 206 420 585 775 0 mB (MeV) Towards experimentally establishing the QCD Phase diagram

  21. List of presentations related to BES Program at RHIC Partonic collectivity at RHIC Presenter: Dr. MASUI, Hiroshi (LBNL) Di-electron Production in Heavy-ion Collisions Presenter: Prof. ZHANG, Yifei (University of Science and Technology of China) Baryon Number Fluctuations in RHIC Beam Energy Scan Presenter: Dr. LUO, Xiaofeng (Central China Normal University) Beam Energy Scan on Hypertriton Production and Lifetime Measurement at STAR Presenter: Ms. ZHU, Yuhui (Shanghai Institute of AppliedPhysics, CAS) Strangeness production in heavy-ion collisions Presenter: ZHU, Xianglei (Tsinghua University)

More Related