Pentaquark baryon production at the Relativistic Heavy Ion Collider

Abstract

Production of pentaquark ${\Theta }^{+}$ baryons in central relativistic heavy ion collisions is studied in a kinetic model. Assuming that a quark-gluon plasma is produced in the collisions, we first determine the number of ${\Theta }^{+}$ produced from the quark-gluon plasma using a parton coalescence model, and then take into consideration its production and absorption in subsequent hadronic matter via the reactions $KN\leftrightarrow \Theta$, $KN\leftrightarrow \pi \Theta$, and $\piN\leftrightarrow\bar KΘ$. We find that although the final ${\Theta }^{+}$ number is affected by hadronic interactions, it remains sensitive to the initial number of ${\Theta }^{+}$ produced from the quark-gluon plasma, particularly in the case of a small ${\Theta }^{+}$ width as imposed by the $K^{+}N$ and $K^{+}d$ scattering data. Because of small baryon chemical potential in the hot dense matter produced in these collisions, the number of produced anti-$\Theta$ is only slightly smaller than that of ${\Theta }^{+}$.

arXiv comment6 pages, 2 figures, revised version, to appear in PLB

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