Hadron resonance gas model with induced surface tension

被引：44

作者：

Sagun, V. V. ^{[1
,2
]}

Bugaev, K. A. ^{[1
]}

Ivanytskyi, A. I. ^{[1
]}

Yakimenko, I. P. ^{[3
]}

Nikonov, E. G. ^{[4
]}

Taranenko, A. V. ^{[5
]}

Greiner, C. ^{[6
]}

Blaschke, D. B. ^{[5
,7
,8
]}

Zinovjev, G. M. ^{[1
]}

机构：

[1] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Metrologichna Str 14b, UA-03680 Kiev, Ukraine

[2] Univ Lisbon, Inst Super Tecn, CENTRA, Av Rovisco Pais 1, P-1049001 Lisbon, Portugal

[3] Linkoping Univ, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden

[4] JINR, Lab Informat Technol, Joliot Curie Str 6, Dubna 141980, Russia

[5] Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst, Kashirskoe Shosse 31, Moscow 115409, Russia

[6] Goethe Univ, Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt, Germany

[7] Univ Wroclaw, Inst Theoret Phys, Pl M Borna 9, PL-50204 Wroclaw, Poland

[8] JINR Dubna, Bogoliubov Lab Theoret Phys, Joliot Curie Str 6, Dubna 141980, Russia

来源：

EUROPEAN PHYSICAL JOURNAL A | 2018年 / 54卷 / 06期

关键词：

EQUATION-OF-STATE; SELF-CONSISTENT APPROXIMATIONS; CONTRACTED RIGID SPHERES; MIXED-PHASE FORMATION; HEAVY-ION COLLISIONS; CHEMICAL FREEZE-OUT; QUARK-GLUON PLASMA; STATISTICAL THERMODYNAMICS; END-POINT; TRANSITION;

D O I：

10.1140/epja/i2018-12535-1

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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.

引用

页数：16

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