Hadron mass spectrum and the shear viscosity to entropy density ratio of hot hadronic matter

Jacquelyn Noronha-Hostler, Jorge Noronha, Carsten Greiner

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

Lattice calculations of the QCD trace anomaly at temperatures T<160 MeV have been shown to match hadron resonance gas model calculations, which include an exponentially rising hadron mass spectrum. In this paper we perform a more detailed comparison of the model calculations to lattice data that confirms the need for an exponentially increasing density of hadronic states. Also, we find that the lattice data is compatible with a hadron density of states that goes as ρ(m)∼m-aexp(m/TH) at large m with a>5/2 (where TH∼167 MeV). With this specific subleading contribution to the density of states, heavy resonances are most likely to undergo two-body decay (instead of multiparticle decay), which facilitates their inclusion into hadron transport codes. Moreover, estimates for the shear viscosity and the shear relaxation time coefficient of the hadron resonance model computed within the excluded volume approximation suggest that these transport coefficients are sensitive to the parameters that define the hadron mass spectrum.

Original languageEnglish (US)
Article number024913
JournalPhysical Review C - Nuclear Physics
Volume86
Issue number2
DOIs
StatePublished - Aug 27 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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