1 / 11

Hadron Spectra in Au+Au Collisions by STAR Experiment at RHIC

Hadron Spectra in Au+Au Collisions by STAR Experiment at RHIC. Masashi Kaneta for the STAR collaboration LBNL. Introduction. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子. 核 子.

wynona
Download Presentation

Hadron Spectra in Au+Au Collisions by STAR Experiment 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. Hadron Spectra in Au+Au Collisions by STAR Experiment at RHIC Masashi Kaneta for the STAR collaboration LBNL Masashi Kaneta, LBL

  2. Introduction 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 核子 • Study of bulk properties • Macroscopic approach • Chemical freeze-out • Thermal freeze-out • Focusing on pT distribution • Thermal freeze-out Temperature • Transverse flow Expansion Cooling Time Masashi Kaneta, LBL

  3. RHIC-STAR experiment • Solenoidal Tracker At RHIC ~40 Institutes/Universities ~300 Collaborators • One of large experiments at RHIC • 2p acceptance • Excellent particle identification Masashi Kaneta, LBL

  4. STAR Event Tracks are reconstructed by online tracking Masashi Kaneta, LBL

  5. Particle Identification • TOF (year 2) • EMC (year 2) • dE/dx by TPC : p,K,p,d,He,…… • Kink method :K • RICH : 1-3 GeV/c for p/K, 1.5-5GeV/c for p • Topology : L, X, W, K0s • Combinatrics : D, L, L(1520), K*, f, …… p K dE/dx p e |p/Z| [GeV/c] Masashi Kaneta, LBL

  6. pT Distribution / Kinetic Freeze-out s • Kinetic freeze-out • End of elastic interactions • Information of momentum is frozen • Boltzmann distribution + flow effect Blast wave model; E. Schnedermann et al., PRC48(1993)2462 Boosted No Boost Masashi Kaneta, LBL

  7. pT distribution vs. Centrality 2 d n - 2 [( GeV/c) ] p dp 2 p dy T T <Npart> for p 3457 2899 2214 1529 1024 634 353 202 94 ------- <Npart> for K, p 3457 2809 2358 1809 1358 1004 704 253 STAR Preliminary K- (dE/dx) K- (kink) p p central peripheral p- K+ (kink) K+ (dE/dx) pT [GeV/c] Masashi Kaneta, LBL

  8. Centrality dependence of T th and <br> 2 d n - 2 GeV/c) [( ] p 2 dp dy p T T • Selected similar centrality region in p and K,p • As a function of centrality • Tth ~ 100 MeV • <br> goes up then saturated • Flow profile changed? p- K+ K- p p 38 115 224 347 <Npart> pT [GeV/c] Masashi Kaneta, LBL

  9. Bombarding Energy Dependence <r> [c] Tth [GeV] • From SPS to RHIC • Increasing flow • Decreasing temperature • Longer time for cooling at RHIC? STAR PHENIX Masashi Kaneta, LBL

  10. Summary • The pT distributions of p, K, and p are obtained as a function of centrality from RHIC-STAR at sNN=130GeV Au+Au • The blast wave model describes the data over all of centrality • As a function of centrality at RHIC • Tth ~ 100 MeV • <br> goes up then saturated (~0.55c) • Flow profile changed? • From SPS to RHIC • Increasing flow • Decreasing temperature • Indicating longer time for cooling at RHIC? Masashi Kaneta, LBL

  11. Test of Flow Profile Masashi Kaneta, LBL

More Related