for the PHENIX collaboration

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Presentation transcript:

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

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

PHENIX acceptance Tracking Time-of-flight D h = 0.8 D f = 180 deg -.4 -.2 0 .2 .4 y 1/17/01 Julia Velkovska , QM2001

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

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

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

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

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

Particle inverse slopes in minimum bias events negative pions 215 +/- 3 +/- 15 MeV kaons 225 +/- 15 +/- 20 MeV antiprotons 300 +/- 10 +/- 20 MeV positive pions 210 +/- 3 +/- 15 MeV kaons 220 +/- 15 +/- 20 MeV protons 320 +/- 10 +/- 20 MeV Teff = Tfo + m0 <bT>2 1/17/01 Julia Velkovska , QM2001

Freeze-out T and flow velocity RHIC Au+Au Tfo= 186 +/- 18 MeV <bt > = 0.36 +/- 0.05 SPS Pb+Pb Tfo = 149 +/- 22 MeV <bt > = 0.39 +/- 0.04 1/17/01 Julia Velkovska , QM2001

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

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

Inverse slope versus Npart 0 100 200 300 400 0 100 200 300 400 1/17/01 Julia Velkovska , QM2001

Flow at RHIC and SPS in central events PHENIX 15% CENTRAL p+ 212 +/-5 +/- 15 MeV p 332 +/-10 +/- 20 MeV protons at SPS <(NA44+NA49)> 290 +/- 10 MeV 1/17/01 Julia Velkovska , QM2001

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

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

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

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

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