Production rates for hadrons, pentaquarks ${\Theta }^{+}$ and ${\Theta }^{\ast ++}$, and di-baryon $(\Omega \Omega {)}_{0^{+}}$ in relativistic heavy ion collisions by a quark combination model

Abstract

The hadron production in relativistic heavy ion collisions is well described by the quark combination model. The mixed ratios for various hadrons and the transverse momentum spectra for long-life hadrons are predicted and agree with recent RHIC data. The production rates for the pentaquarks ${\Theta }^{+}$, ${\Theta }^{\ast ++}$ and the di-baryon $(\Omega \Omega {)}_{0^{+}}$ are estimated, neglecting the effect from the transition amplitude for constituent quarks to form an exotic state.

The difference between our model and other combination models is clarified. The scaled transverse momentum spectra for pions, kaons and protoms at both 130 AGeV and 200 AGeV are given, replacing the previous results in transverse momentum spectra

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