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Pentaquark baryon production at the relativistic heavy ion collider

2004; Elsevier BV; Volume: 601; Issue: 1-2 Linguagem: Inglês

10.1016/j.physletb.2004.09.027

1873-2445

Lie-Wen Chen, Vincenzo Greco, C. M. Ko, S.H. Lee, Wei Liu,

Particle physics theoretical and experimental studies

Production of pentaquark Θ+ 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 Θ+ 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↔Θ, KN↔πΘ and πN↔K¯Θ. We find that although the final Θ+ number is affected by hadronic interactions, it remains sensitive to the initial number of Θ+ produced from the quark–gluon plasma, particularly in the case of a small Θ+ 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-Θ is only slightly smaller than that of Θ+.