The influence of net-quarks on the yields and rapidity spectra of identified hadrons

Abstract

Within a quark combination model, we study systematically the yields and rapidity spectra of various hadrons in central Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. We find that considering the difference in rapidity between net-quarks and newborn quarks, the data of multiplicities, rapidity distributions for ${\pi }^{\pm }$, $K^{\pm }$, $p(\bar{p})$ and, in particular the ratios of charged antihadron to hadron as a function of rapidity, can be well described. The effect of net-quarks on various hadrons is analysed, and the rapidity distributions for $K_s^0$, $\Lambda (\bar{\Lambda })$, ${\Sigma }^{+}({\bar{\Sigma }}^{{}_{-}})$, ${\mathrm{\Xi }}^{-}$ (${\bar{\mathrm{\Xi }}}^{{}_{+}}$) and ${\mathrm{\Omega }}^{-}({\bar{\mathrm{\Omega }}}^{{}_{+}})$ are predicted. We discuss the rapidity distribution of net-baryon, and find that it reflects exactly the energy loss of colliding nuclei.

Comments: 8 pages, 7 figures