Tatsuya Chujo for the PHENIX collaboration

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Presentation transcript:

Tatsuya Chujo for the PHENIX collaboration Identified charged hadron production in Cu+Cu at sNN = 22.5 and 62.4 GeV in PHENIX Tatsuya Chujo for the PHENIX collaboration

Introduction ~ Baryon Anomaly at RHIC ~ PHENIX: PRL 91, 172301 (2003), PRC 69, 034909 (2004) In Au+Au sNN = 200 GeV central collisions: Pions: Strong suppression of yields above pT ~ 2 GeV/c, due to jet quenching effect. Protons: No suppression for at intermediate pT (2-5 GeV/c). Called “Baryon anomaly at RHIC”. Quark recombination models reproduce the data qualitatively. Au+Au @ sNN = 200 GeV Nuclear Modification Factor ~ RCP

(anti-) Proton / Ratio p/ ratios in Au+Au 200 GeV More (anti) baryons than pions at moderate pT (2-5 GeV/c). Does not look like vacuum jet fragmentation. PHENIX: PRL 91, 172301 (2003), PRC 69, 034909 (2004) Central Peripheral (anti-) Proton / Ratio Where is the onset of the baryon anomaly at RHIC? New Cu+Cu data at lower sNN may give an answer...

Charged particle identification by TOF Charge x Momentum (GeV/c) Data Analysis Data set: RHIC Run-5 (2005), measured by the PHENIX experiment. Cu+Cu at 22.5 GeV. Cu+Cu at 62.4 GeV. Detectors: Drift Chamber, PC1, BBC and TOF for PID charged analysis. Centrality: Subdivided minimum bias triggered events, based on BBC charge (62 GeV), or the number of PC1 hit (22 GeV). Corrections: Geometrical acceptance, in flight decay. NOTE: No weak decay feed-down correction applied. Charged particle identification by TOF Charge x Momentum (GeV/c) 1/ Cu+Cu @ 22.5 GeV

Results pT spectra in Cu+Cu at sNN = 22.5 and 62.4 GeV. p/+ and p/- ratios vs. pT. Nuclear modification factor: RAA.

pT spectra for pions Filled symbols : + Open symbols : -

pT spectra for kaons Filled symbols : K+ Open symbols : K-

* No weak decay feed-down correction applied pT spectra for protons * No weak decay feed-down correction applied

pT spectra for antiprotons * No weak decay feed-down correction applied

p/ in Cu+Cu 22.5 GeV Almost no centrality dependence. Larger p/+ ratios than those in Au+Au 200 GeV (0.5 @ pT = 1.5 GeV). Affected by the spectator protons (not produced protons) at lower sNN. p/- ratios are ~0.3-0.4 at pT = 2 GeV/c, which is close to the fragmentation expectations in p+p. Almost no centrality dependence.

p/ in Cu+Cu 62.4 GeV p/+ ratios are reduced, compared to those in Cu+Cu 22 GeV. p/- ratio in most central collisions reaches R=~0.6 at pT = 2 GeV/c. Centrality dependence is seen. Peripheral pbar/-: consistent with p+p value.

Beam energy dep. 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.

RAA for pions (22 GeV) Error notations: - Error bars: statistical error for Cu+Cu spectra - Gray boxes: 1) sys. error for p+p reference. 2) sys. error for Cu+Cu spectra. - Lines: Ncoll error (1.) p+p reference: global fit of pion data at s ~62 GeV (D. d’Enterria). p+p reference: global fit of pion data at s ~22 GeV in p+p. RAA is ~1.5 at pT = 2 GeV/c, no suppression.

RAA for pions (62 GeV) p+p reference: global fit of pion data at s ~62 GeV. nucl-ex/ nucl-ex/0411049, D. d’Enterria. Similar, might be slightly smaller than that in 22 GeV.

RAA for proton (22 GeV) p+p reference: fitted the ISR data in p+p 63 GeV, B. Alper et al, NPB 100, 237 (1975). Larger than pions significantly, which suggests the large contributions of spectator protons.

RAA for proton (62 GeV) p+p reference: fitted the ISR data in p+p 63 GeV, B. Alper et al, NPB 100, 237 (1975). Similar as in 22.5 GeV, but slightly smaller value.

RAA for antiproton (22 GeV) p+p reference: fitted the ISR data in p+p 63 GeV, B. Alper et al, NPB 100, 237 (1975). Different pT dependence from protons. RAA ~ 1 (similar to pions’ RAA), binary collision scaling worked?

RAA for antiproton (62 GeV) p+p reference: fitted the ISR data in p+p 63 GeV, B. Alper et al, NPB 100, 237 (1975). Similar to that for 22 GeV (and also pion’s RAA).

Summary Measured pT spectra for , K, p, p in Cu+Cu at sNN = 22.5 and 62.4 GeV in PHENIX. p/+ ratio : decreasing as a function of sNN in Cu+Cu. Suggests a significant contribution of spectator protons (not by the produced protons) in lower energies Cu+Cu. p/- ratio : increasing as a function sNN in Cu+Cu. Cu+Cu 22.5 GeV shows that there is (almost) no centrality dependence, and central Cu+Cu already reaches to the p+p values. Cu+Cu 62.4 GeV central data is higher than that in 22.5 GeV, centrality dependence is seen. RAA : Particle type dependent.  : no suppression at both 22.5 and 62.4 GeV in Cu+Cu. p: enhanced (mostly due to the spectator nucleons). p: binary scaling, very similar to pion’s RAA.

Backup Slides

p+p fit at s = 22.5 GeV (pions) Compilation and fitting by D. d’Enterria

RAA for 0 in Cu+Cu 22.5 GeV PbSc (0-10%) PbGl (0-10%)

SPS and AGS Nucl. Phys. A 757, 184 (2005), PHENIX, nucl-ex/0410003

NA49 data p/+ (NA49) p/- (NA49) NA49 collaboration, nucl-ex/0510054

RAA for pions 22.5 GeV 62.4 GeV

RAA for kaons 22.5 GeV 62.4 GeV

RAA summary (22 GeV)

RAA summary (62 GeV)

p/p ratio vs. pT 22.5 GeV 62.4 GeV

-/+, K-/K+ vs. pT (22.5 GeV)

-/+, K-/K+ vs. pT (62.4 GeV)

p+p reference data (with fit) 23 GeV 63 GeV Kaons and protons: Fit results of ISR p+p 63 GeV data. B. Alper et al, NPB100(1975)237. pions: global fits of p+p data, e.g. nucl-ex/0411049, D. d’Enterria.