Resonance Production in Heavy Ion Collisions: Suppression of $\Lambda (1520)$ and Enhancement of $\Sigma (1385)$

Abstract

We investigate the yield of $\Lambda (1520)$ resonance in heavy ion collisions within the framework of a kinetic master equation without the assumption of chemical equilibrium. We show that reactions such as $\Lambda (1520)+\pi \leftrightarrow {\Sigma }^{\ast }$ can favor ${\Sigma }^{\ast }$ production, thereby decreasing the $\Lambda (1520)$ yield. Within the same approach we thus find a yield enhancement for $\Sigma (1385)$ and a yield suppression for $\Lambda (1520)$.

Comments: 13 pages, 9 figures, accepted to Physical Review C, right figure 9 was replaced because lines style was mixed up