Identified Hadron Production at low mt-mo in Cu+Cu Collisions at √(SNN) = 22.4 GeV

Target Journal

Physics Review C

Abstract

Identified charged particle spectra of π±, K±, p and p measured using energy loss in the STAR TPC are reported for (|y|<0.1) for Cu+Cu collisions at √(SNN ) = 22.4 GeV. Total particle production, particle ratios, and average transverse momenta, are presented for different collision centralities. Kinetic and chemical freezeout properties are presented as a function of the number of participating nucleons for the system. These results are compared with previously published results from collisions of different systems (Pb+Pb or Au+Au) at similar collision energies.

Results

Event Quality Cuts

Vertex Z Position Vertex XY Position

Event Vertex Distribution in Z (left) with a cut of ± 30 cm along the Beamline and in the XY-Plane (right) with a radial cut of r < 1 cm around the rms values of Vx and Vy

1) Event Cuts

2) Refmult w/ borders

3) PID Plot

4) Data vs. Embed pt vs. eta / nfits / dca

5) Efficiencies pi k p

6) Spectra pi k p with centrality

7) dN/dy vs nPart with Cu 62/200

8) vs. Npart / vs. dN/dη 9) Particle Ratios Table / Ratio vs. dN/deta

10) Comparison with 17.3 pp, PbPb, 19.6 AuAu and SulfurSulfur at SPS

11) Radial Flow Siemens rasmussen / Blast wave

12) Chemical Freezeout w/ system and impact parameter

T,mu_B

gamma_s, dNch/deta

13) HBT

Conclusions

Analysis

CuCu 22.4 GeV Spectra Analysis

CuCu 22.4 GeV HBT Analysis