Production rates for hadrons, pentaquarks $\Theta ^+$ and $\Theta   ^{*++}$, and di-baryon $(\Omega\Omega)_{0^{+}}$ in relativistic heavy ion   collisions by a quark combination model
  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 $\Theta ^+$, $\Theta ^{*++}$ and the di-baryon $(\Omega\Omega)_{0^{+}}$ are estimated, neglecting the effect from the transition amplitude for constituent quarks to form an exotic state. 
Feng-lan Shao, Qu-bing Xie, Qun Wang