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

摘要

The hadron production in relativistic heavy ion collisions is well describedby the quark combination model. The mixed ratios for various hadrons and thetransverse momentum spectra for long-life hadrons are predicted and agree withrecent RHIC data. The production rates for the pentaquarks $\Theta ^+$, $\Theta^{*++}$ and the di-baryon $(\Omega\Omega)_{0^{+}}$ are estimated, neglectingthe effect from the transition amplitude for constituent quarks to form anexotic state.