Centrality dependence of $p_T$ spectra for identified hadrons in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}=200$ GeV

Abstract

The centrality dependence of transverse momentum spectra for identified hadrons at midrapidity in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV is systematically studied in a quark combination model. The ${\mathrm{p}}_{\mathrm{T}}$ spectra of ${\pi }^{\pm }$, $K^{\pm }$, $p(\bar{p})$ and $\Lambda (\bar{\Lambda })$ in different centrality bins and the nuclear modification factors ($R_{CP}$) for these hadrons are calculated. The centrality dependence of the average collective transverse velocity $<\beta (r)>$ for the hot and dense quark matter is obtained in Au+Au collisions, and it is applied to a relative smaller Cu+Cu collision system. The centrality dependence of ${\mathrm{p}}_{\mathrm{T}}$ spectra and the $R_{CP}$ for ${\pi }^0$, $K_s^0$ and $\Lambda$ in Cu+Cu collisions at $\sqrt{s_{NN}}=200$ GeV are well described. The results show that $<\beta (r)>$ is only a function of the number of participants $N_{part}$ and it is independent of the collision system.

7 pages, 6 figures

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Cited by in corpus (3)

• Hadron production by quark combination in central Pb+Pb collisions at $\sqrt{s_{NN}}=17.3$ GeV
• Yield correlations and $p_T$ dependence of charm hadrons in Pb + Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV
• Hadronic Rapidity Spectra in Heavy Ion Collisions at SPS and AGS energies in a Quark Combination Model