Hadronic Rapidity Spectra in Heavy Ion Collisions at SPS and AGS energies in a Quark Combination Model

Abstract

The quark combination mechanism of hadron production is applied to nucleus-nucleus collisions at the CERN Super Proton Synchrotron (SPS) and BNL Alternating Gradient Synchrotron (AGS). The rapidity spectra of identified hadrons and their spectrum widths are studied. The data of ${\pi }^{-}$, $K^{\pm }$, $\varphi$, $\Lambda$, $\bar{\Lambda }$, ${\Xi }^{-}$, and ${\bar{\Xi }}^{+}$ at 80 and 40 AGeV, in particular at 30 and 20 AGeV where the onset of deconfinement is suggested to happen, are consistently described by the quark combination model. However at AGS 11.6 AGeV below the onset the spectra of ${\pi }^{\pm }$, $K^{\pm }$ and $\Lambda$ can not be simultaneously explained, indicating the disappearance of intrinsic correlation of their production in the constituent quark level. The collision-energy dependence of the rapidity spectrum widths of constituent quarks and the strangeness of the hot and dense quark matter produced in heavy ion collisions are obtained and discussed.

7 pages, 5 figures

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Cited by in corpus (7)

• Quark number scaling of $p_T$ spectra for $\Omega$ and $\varphi$ in relativistic heavy-ion collisions
• Elliptic flow of hadrons in equal-velocity quark combination mechanism in relativistic heavy-ion collisions
• Strange hadron production in a quark combination model in Au+Au collisions at RHIC energies
• Hadronization effects on the baryon-strangeness correlation in quark combination models
• Statistical method in quark combination model
• A possible evidence of observation of two mixed phases in nuclear collisions
• Energy dependence of resonance production in relativistic heavy ion collisions