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Transverse Momentum Spectrum of in Au+Au @ 200GeV at RHIC STAR

Transverse Momentum Spectrum of in Au+Au @ 200GeV at RHIC STAR. Weekly Update. Xiao Bin. Wang. High Energy Center, Tsinghua U., Beijing. 100084. Outline. Introduction of Production @ STAR 2004 ; Event Selection and features ;

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Transverse Momentum Spectrum of in Au+Au @ 200GeV at RHIC STAR

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  1. Transverse Momentum Spectrum of in Au+Au @ 200GeV at RHIC STAR Weekly Update Xiao Bin. Wang High Energy Center, Tsinghua U., Beijing. 100084

  2. Outline • Introduction of Production @ STAR 2004 ; • Event Selection and features ; • Transverse Momentum Spectrum ; • Ratio ;

  3. 1: Introduction

  4. Time Projection Chamber (TPC) • Silicon Vertex Tracker (SVT) • E-M Calorimeter (EMCAL) • Forward Time Projection Chamber (FTPC) • Central Trigger Barrel (CTB) • Zero Degree Calorimeter (ZDC) • Time of Flight (TOF) • RICH (1m*1m, for high Pt) Tracks in TPC fiducial volume : 1st collision at √sNN = 60GeV , sideview (left) ; 1st collision at √sNN = 130GeV , endniew (right) ;

  5. 2: Event Selection and Rec. Rotated Background & V0 Cuts • V0 Cut Analysis Backgrounds Rotate all positive tracks • V0 Cut List (Jiaxu) • DcaV0:Distance of Closest Approach between Positive Track1 and Negative Track2 • DcaImpact:V0 Particle Track Distance of Closest Approach to Primary Vertex • Daughter Dca:Positive/Negative daughter Distance of Closest Approach to Primary Vertex • Decay length:V0 Particle Decay Length

  6. Au+Au @ 200GeV 2004 Info. can be find at STAR Website BNL: http://www.star.bnl.gov/protected/common/common2004/trigger2004/200gev/200gevFaq.html 312 Physics RUNs

  7. Bin 9 to 1 Multiplicity 0 - 10%  Centrality: 8 & 9 10 – 40% Centrality: 7 & 6 & 5 40 – 80% Centrality: 4 & 3 & 2 & 1 Combined into 3 bin:

  8. RUN: 5024009-hist.root

  9. By Hui Long , UCLA

  10. Transverse Momentum Spectrum Triggered Events

  11. Error bars shown are of statistical only !

  12. By Hui Long , UCLA

  13. Total Events of 312 RUNs

  14. Error bars shown are of statistical only !

  15. Error bars shown are of statistical only !

  16. 3: Transverse Momentum Spectrum

  17. Error bars shown are of statistical only !

  18. 4: Ratio Error bars shown are of statistical only !

  19. Error bars shown are of statistical only !

  20. Error bars shown are of statistical only !

  21. Error bars shown are of statistical only !

  22. By Hui Long, UCLA

  23. Back up (From Hui’s Thesis)

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