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Hadron resonance gas model with induced surface tension
Natl Acad Sci Ukraine, Ukraine; Univ Lisbon, Portugal.
Natl Acad Sci Ukraine, Ukraine.
Natl Acad Sci Ukraine, Ukraine.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, no 6, article id 100Article in journal (Refereed) Published
Abstract [en]

Here we present a generalization of the multicomponent Van der Waals equation of state in the grand canonical ensemble. For the one-component case the third and fourth virial coefficients are calculated analytically. It is shown that the adjustment of a single model parameter allows us to reproduce the third and fourth virial coefficients of the gas of hard spheres with small deviations from their exact values. A thorough comparison of the compressibility factor and speed of sound of this model with the one- and two-component Carnahan-Starling equation of state is made. We show that the model with the induced surface tension can reproduce the results of the Carnahan-Starling equation of state up to the packing fractions 0.2-0.22 at which the Van der Waals equation of state is inapplicable. Using this approach we develop an entirely new hadron resonance gas model and apply it to a description of the hadron yield ratios measured at AGS, SPS, RHIC and ALICE energies of nuclear collisions. We confirm that the strangeness enhancement factor has a peak at low AGS energies and that there is a jump of chemical freeze-out temperature between the two highest AGS energies. Also we argue that the chemical equilibrium of strangeness, i.e gamma(s) similar or equal to 1, observed above the center of mass collision energy 8.7 GeV, may be related to a hadronization of quark gluon bags which have a Hagedorn mass spectrum, and, hence, it may be a new signal for the onset of deconfinement.

Place, publisher, year, edition, pages
SPRINGER , 2018. Vol. 54, no 6, article id 100
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:liu:diva-149716DOI: 10.1140/epja/i2018-12535-1ISI: 000436363800001OAI: oai:DiVA.org:liu-149716DiVA, id: diva2:1234393
Note

Funding Agencies|Section of Nuclear Physics of National Academy of Sciences of Ukraine; Fundacao pars a Ciencia e Tecnologia (FCT), Portugal; instituto Superior Tocnico, Universidade de Lisboa [UID/FIS/00099/2013]; Ministry of Science and Education of the Russian Federation [3.3380.2017/4.6]; National Research Nuclear University "MEPhl" in the framework of the Russian Academic Excellence Project [02.a03.21.0005]; HIC; MENAI Academic Excellence program [02.a03.21.0005]

Available from: 2018-07-24 Created: 2018-07-24 Last updated: 2018-08-14

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