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arxiv: 0911.3130 · v1 · pith:3A2CSV2Rnew · submitted 2009-11-16 · ⚛️ nucl-ex

Identified high-p_{T} spectra in Cu+Cu collisions at sqrt{s_{NN}}=200 GeV

classification ⚛️ nucl-ex
keywords momentasizespectrasystemtransverseavailablebaryoncollisions
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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.

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