Constant Trace Anomaly as a Universal Condition for the Chemical Freeze-Out - INSPIRE

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Constant Trace Anomaly as a Universal Condition for the Chemical Freeze-Out

A. Tawfik
(
- WLCAPP, Cairo and
- Egyptian Ctr. Theor. Phys., Cairo
)

Aug 7, 2013

7 pages

Published in:

Phys.Rev.C 88 (2013) 035203

Published: Sep 12, 2013

e-Print:

1308.1712 [hep-ph]

DOI:

10.1103/PhysRevC.88.035203

Report number:

ECTP-2013-06

View in:

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Abstract: (APS)

Finding out the universal conditions describing the freeze-out parameters has been the subject of various phenomenological studies. In the present work, we introduce a new condition based on constant-trace anomaly (or interaction measure) calculated in the hadron resonance gas (HRG) model. Various extensions to the ideal HRG which are conjectured to take into consideration different types of interactions have been analyzed. When comparing HRG thermodynamics to that of lattice quantum chromodynamics, we conclude that the hard-core radii are practically irrelevant, especially when HRG includes all resonances with masses less than 2 GeV. It is found that the constant-trace anomaly (or interaction measure) agrees well with most previous conditions.

Note:

15 pages, 3 figures with 4 eps graphs

74.40.Gh
05.70.Fh
interaction: measure
hadron: resonance: gas
freeze-out: chemical
trace anomaly
quantum chromodynamics
lattice
thermodynamics
critical phenomena

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Figures(4)

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