Identified high-$p_T$ spectra in Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV

Abstract

We report new results on identified (anti)proton and charged pion spectra at large transverse momenta (3<$p_T$<10 GeV/c) from Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV using the STAR detector at the Relativistic Heavy Ion Collider (RHIC). This study explores the system size dependence of two novel features observed at RHIC with heavy ions: the hadron suppression at high-$p_T$ and the anomalous baryon to meson enhancement at intermediate transverse momenta. Both phenomena could be attributed to the creation of a new form of QCD matter. The results presented here bridge the system size gap between the available pp and Au+Au data, and allow the detailed exploration for the on-set of the novel features. Comparative analysis of all available 200 GeV data indicates that the system size is a major factor determining both the magnitude of the hadron spectra suppression at large transverse momenta and the relative baryon to meson enhancement.

Submitted to Phys. Rev. C, 9 pages, 5 figures

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• Strangeness and bulk freeze-out properties at RHIC
• Properties of particle production at large transverse momentum in Au+Au and Cu+Cu collisions at RHIC

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