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Ukr. J. Phys. 2015, Vol. 59, N 11, p.1051-1059
doi:10.15407/ujpe59.11.1051    Paper

Oliinychenko D.R.1,2, Sagun V.V.1, Ivanytskyi A.I.1, Bugaev K.A.1

1 Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Scs. of Ukraine
(14b, Metrolohichna Str., Kyiv 03680, Ukraine; e-mail: dimafopf@gmail.com, v_sagun@ukr.net, a_iv_@ukr.net, bugaev@th.physik.uni-frankfurt.de)
2 FIAS, Goethe-University, Frankfurt
(1, Ruth-Moufang Str., Frankfurt am Main 60438, Germany)

Separate Chemical Freeze-Out of Strange Particles with Conservation Laws

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

Abstract: The Hadron Resonance Gas Model with two freeze-outs connected by the conservation laws is considered. We are arguing that the chemical freeze-out of strange hadrons should occur earlier than the chemical freeze-out of non-strange hadrons. The hadron multiplicities measured in the heavy ion collisions for the center-of-mass energy range 2.7–200 GeV are described well by such a model. Based on a success of such an approach, a radical way to improve the Hadron Resonance Gas Model performance is suggested. Thus, we suggest to identify the hadronic reactions that freeze-out noticeably earlier or later that most of the others reactions (for different collision energies they may be different) and to consider a separate freeze-out for them.

Key words: Hadron Resonance Gas Model with the multicomponent hard-core repulsion, hadron multiplicity ratios, chemical freeze-out, Strangeness Horn, strange hadrons.