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Current issue   Ukr. J. Phys. 2015, Vol. 59, N 8, p.755-763
doi:10.15407/ujpe59.08.0755    Paper

Sagun V.V.

Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine
(14-b, Metrolohichna Str., Kyiv, 03680, Ukraine; e-mail: v_sagun@ukr.net)

Λ-Anomaly in the Hadronic Chemical Freeze-out

Section: Fields and elementary particles
Original Author's Text: Ukrainian

Abstract: A new way to overcome the Λ hyperon selective suppression, which is known as the Λ-anomaly, has been suggested. In particular, the additional radius of a Λ 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 χ2/dof = 52/55 ≃ 0.95.

Key words: hadron multiplicities, hard-core repulsion, chemical freeze-out, strangeness suppression.