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for the PHENIX collaboration

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1 for the PHENIX collaboration
Pt Spectra of Identified Hadrons Measured with the PHENIX experiment at RHIC Julia Velkovska, SUNY at Stony Brook, for the PHENIX collaboration The detector Hadron identification Corrections to raw distributions Mt and Pt distributions - minimum bias and as a function of centrality Teff and < pt > versus Npart 1/17/01 Julia Velkovska , QM2001

2 The PHENIX detector Hadron identification drift chamber (DC)
Pad chamber 1 (PC1) Time-of-flight (TOF) Beam-beam counters (BBC) 1/17/01 Julia Velkovska , QM2001

3 PHENIX acceptance Tracking Time-of-flight D h = 0.8 D f = 180 deg
y 1/17/01 Julia Velkovska , QM2001

4 Hadron Identification
Tracking system: drift chamber , Pad chamber momentum measurement path length to TOF detector Timing system beam-beam counters - start time Time-of-flight counters - stop time 1/17/01 Julia Velkovska , QM2001

5 Particle Id Cuts st = 1205 ps, sa=2.80.2 mrad, PID bands defined in
mass2 vs momentum space sms=0.60.1 mrad K cut off at 1.6 GeV/c p cut off at 2.2 GeV/c protons - up to 5 GeV/c st = 1205 ps, sa=2.80.2 mrad, 1/17/01 Julia Velkovska , QM2001

6 Corrections based on single particle Monte Carlo
K Overall scale acceptance dead areas tracking efficiency decays Momentum resolution Multiplicity dependence- small: studied by track embedding into real events acceptance 1/17/01 Julia Velkovska , QM2001

7 Minimum Bias mt distributions
1/17/01 Julia Velkovska , QM2001

8 Minimum Bias mt distributions
Fit ranges in pt : pions: 0.3 < pt < 1.0(GeV/c) kaons: 0.6 < pt < 1.0 (GeV/c) protons: 0.8 < pt < 2.2 (GeV/c) 0.8 < pt < 3 (GeV/c) anti-protons: 1/17/01 Julia Velkovska , QM2001

9 Particle inverse slopes in minimum bias events
negative pions /- 3 +/- 15 MeV kaons /- 15 +/- 20 MeV antiprotons /- 10 +/- 20 MeV positive pions /- 3 +/- 15 MeV kaons /- 15 +/- 20 MeV protons /- 10 +/- 20 MeV Teff = Tfo + m0 <bT>2 1/17/01 Julia Velkovska , QM2001

10 Freeze-out T and flow velocity
RHIC Au+Au Tfo= 186 +/- 18 MeV <bt > = /- 0.05 SPS Pb+Pb Tfo = 149 +/- 22 MeV <bt > = /- 0.04 1/17/01 Julia Velkovska , QM2001

11 Centrality Selection Centrality selection based on the correlation between beam-beam counters and ZDC counters Number of tracks/event with these selections 1/17/01 Julia Velkovska , QM2001

12 Pion mt-distributions as a function of centrality
1/17/01 Julia Velkovska , QM2001

13 Inverse slope versus Npart
1/17/01 Julia Velkovska , QM2001

14 Flow at RHIC and SPS in central events
PHENIX 15% CENTRAL p /-5 +/ MeV p /-10 +/- 20 MeV protons at SPS <(NA44+NA49)> 290 +/- 10 MeV 1/17/01 Julia Velkovska , QM2001

15 Comparison to theory : hydro + cascade
Derek Teaney Proton slopes are sensitive to the EOS The PHENIX measurement has discriminatory power against various model assumptions 1/17/01 Julia Velkovska , QM2001

16 Transverse momentum distributions in minimum bias events
Large proton and anti-proton yield at high pt Sort in centrality classes In the entire pt range fit: power law function to p exponential - K and p extract <pt> from the fit 1/17/01 Julia Velkovska , QM2001

17 Mean pt versus number of participants
Pions steep rise and plateau Protons gradual rise and higher <pt> 1/17/01 Julia Velkovska , QM2001

18 Conclusions Measured p, K, p up to 2.2/1.6/3.5 GeV/c in pt
Pion spectra nearly independent of Npart beyond the very peripheral collisions Kaon inverse slopes are rather similar to those of pions Protons/anti-protons inverse slopes rising with Npart Proton inverse slopes higher than at SPS. High pt hadron yields dominated by protons/anti-protons 1/17/01 Julia Velkovska , QM2001

19 Charged hadron spectra
After normalizing the p- yield to p0 yield - sum all identified negative hadron spectra Compare to non-identified h- spectra - very good agreement observed Significant contribution of anti-protons above pt = 2 GeV/c 1/17/01 Julia Velkovska , QM2001

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