Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-10-30
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 4 figures. Proceedings of the DPF-2009 Conference, Detroit, MI, July 27-31, 2009
Scientific paper
We present high transverse momentum, $p_{T}$, pion ($\pi$), proton ($p$), kaon ($K$), and rho ($\rho$) spectra measured with the STAR experiment from p+p and Au+Au collisions with \sNN{200}. We find the $K/\pi$ ratio to be enhanced in Au+Au \sNN{200} collisions relative to p+p \sNN{200} collisions at $p_{T} > 5$ GeV/c. The enhancement persists until $p_{T} \sim 12$ GeV/c for central Au+Au 200 GeV collisions. We also show the nuclear modification factor, $R_{AA}$, measured at the same center of mass energy, and find $R_{AA}(K)$ and $R_{AA}(p)$ to be higher than $R_{AA}(\pi)$ at $p_T > 5$ GeV/c. Implications for medium induced modifications of jet chemistry is discussed.
for the STAR Collaboration
Timmins Anthony R.
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