$\Lambda$ - anomaly in the hadron chemical freeze-out

Abstract

A new way to overcome the $\Lambda$ hyperon selective suppression, which is known as the $\Lambda$-anomaly, has been suggested. In particular, the additional radius of a $\Lambda$ hyperon is introduced into the model of hadron resonance gas with the multicomponent hard-core repulsion. The proposed approach allows one to describe the hadron multiplicity ratios measured at the AGS, SPS and RHIC energies with the accuracy ${\chi }^2/dof=$52/55$\simeq$0.95.

Comments: 9 pages, 13 figures