Identified Charged Hadron

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Presentation transcript:

Identified Charged Hadron Masahiro Konno (Univ. of Tsukuba)

Production at RHIC-PHENIX for the PHENIX Collaboration konno@rcf.rhic.bnl.gov

Physics motivation Nuclear Modification Factor RAA nucl-ex/0603010 Au+Au 200 GeV - High-pT suppression due to parton energy loss in the medium (jet quenching). The suppression patterns depend on particle type. Protons are enhanced, while pions and kaons are suppressed.

Baryon Enhancement Ratio v2 PRL 91, 172301 (2003) Ratio v2 - p/ ratio ~1 for central Au+Au at intermediate pT (2-4 GeV/c). Larger than expected from jet fragmentation (measured in pp, e+e-). Baryon / Meson difference at intermediate pT. (on RAA (nuclear modification factor) , v2 (elliptic flow) etc.)

Quark Recombination p/ Fries, R et al PRC 68 (2003) 044902 Greco, V et al PRL 90 (2003) 202302 Hwa, R et al PRC 70(2004) 024905 At intermediate pT, recombination of partons may be a more efficient mechanism of hadron production than fragmentation. A number of models predicted a turnover in the B/M ratio at pT just above where the available data finished…

What we should do: What is the origin of (anti-)proton enhancement at intermediate pT? Possible sources (medium effect) : - Strong radial flow - Recombination of quarks - Baryon junction pT spectra and particle ratios (Baryon/Meson) provide the most basic tool to investigate the hadronization mechanisms. To distinguish the different production mechanism for protons and pions at intermediate and higher pT.

PHENIX detector EMCal TOF Aerogel Cherenkov Counter Drift Chamber - Central Arm Detectors (magnetic spectrometer) - Event Characterization detectors TOF Aerogel Cherenkov Counter Hadron Identification at High pT - n = 1.0113. - Full installation in 2004. - Proton separation from π/K up to 8 GeV/c. Drift Chamber (momentum meas.) Tracking detectors (PC1,PC2,PC3)

PID detectors No Cut p K+ π+ Aerogel Veto Clear Proton Line!

Results pT spectra of (anti-)protons Identified with ACC Data Analysis - Data set: Au+Au 200 GeV (taken in Run4, 2003-2004) High statistics (440M events used) Charged Hadron PID: TOF Aerogel (for PID extension toward high pT, Run4-) MC Simulations: - Acceptance, efficiency (occupancy) corrections - No feed-down correction pT spectra of (anti-)protons Identified with ACC pT reach extended for (anti-)protons with fine centrality bins.

pbar/p vs. pT No significant centrality or pT dependence Peripheral No significant centrality or pT dependence (up to 6 GeV/c).

p/ vs. pT p/ p/ ACC * No feed-down correction. * p+p data (nucl-ex/0603010)

p/ vs. pT (centrality dep.) ACC p/ p/ Central Peripheral - p/ (pbar/) ratios seem to turn over at intermediate pT, and close to the value of fragmentation at higher pT. - Indicating transition from soft to hard at intermediate pT.

Proton RCP TOF Proton RCP shows unity above 2 GeV/c. Peak structure at 2~3 GeV/c. Proton RCP seems to show decreasing above 3 GeV/c. Expected to merge to pion RCP at higher pT. Need more statistics to look at high-pT points.

p/ ratio in 62 GeV Au+Au 62 GeV Au+Au - Rapidly increasing with pT for 62 GeV. Weaker centrality dependences than those of 200 GeV. Significant difference for p and pbar at 62 GeV. (Indicating more baryon transport and less p-pbar pair production at 62 GeV than 200 GeV.)

p/ ratio in Cu+Cu p/+ ratio : decreasing as a function of sNN. p/- ratio : increasing as a function sNN. Cu+Cu 22.5 GeV central data reaches the p+p values. Cu+Cu 62.4 GeV central data is higher than that in 22.5 GeV. Suggests a significant contribution of incoming protons (not by the produced protons) in lower energies Cu+Cu.

Summary Next pT reach of PID (especially for p, pbar) extended with: - High statistics 200 GeV Au+Au data - New PID detector (Aerogel) Results: - pbar/p ratio No centrality or pT dependence - p/ ratio Indicating transition from soft to hard at intermediate pT - RCP (Anti-)proton RCP shows decreasing above 3 GeV/c Collision system dependence: - Similar turnover curve on p/ in 62 GeV Au+Au - Npart scaling on particle ratios (Cu+Cu / Au+Au) Comparison with models: - Recombination models seem to be matched to the experimental data. Next - Improve data analysis, reduce sys. errors for PID at high pT Analyze Run5 p+p (abundant) data to make RAA at higher pT MRPC-TOF (TOF~100ps) to be installed for PID upgrade