High $p_T$ Identified Particle Spectra

Abstract

I will present an overview of identified particle spectra at high $p_T$ ($p_T{}_{\sim }^{>}$ 5 GeV/$c$) in both p+p collisions and AA collisions at RHIC. In p+p collisions, summary of particle ratios of K, $\eta$, $\omega$, $\rho$, $\varphi$, $p$, $\bar{p}$, $\Lambda$ and heavy-flavor (open charm, $J/\Psi$) to $\pi$ at high-pt will be compiled and compared to the ratios of integrated yields. The spectra are used in $x_t$ scaling study and compared to pQCD calculations. These will help us establish particle composition in jets and the quark and gluon contributions to hadron production at high $p_T$. Similar jet chemistry has been extracted in Au+Au data in search for a quantitative measure of color charge dependence of jet energy loss.

8 pages, 4 figures, Quark Matter 2008 proceedings, Jaipur, India, Feb., 2008

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