Polyakov loop and the Hadron resonance gas model
Megías Fernández, Eugenio (Universitat Autònoma de Barcelona. Departament de Física)
Ruiz Arriola, E. (Universidad de Granada. Departamento de Física Atómica, Molecular y Nuclear)
Salcedo, L. L. (Universidad de Granada. Departamento de Física Atómica, Molecular y Nuclear)
American Physical Society

Fecha:	2012
Resumen:	The Polyakov loop has been used repeatedly as an order parameter in the deconfinement phase transition in QCD. We argue that, in the confined phase, its expectation value can be represented in terms of hadronic states, similarly to the hadron resonance gas model for the pressure. Specifically, L(T)≈12∑αgαe−Δα/T, where gα are the degeneracies and Δα are the masses of hadrons with exactly one heavy quark (the mass of the heavy quark itself being subtracted). We show that this approximate sum rule gives a fair description of available lattice data with Nf=2+1 for temperatures in the range 150  MeV<T<190  MeV with conventional meson and baryon states from two different models. For temperatures below 150 MeV different lattice results disagree. One set of data can be described if exotic hadrons are present in the QCD spectrum while other sets do not require such states.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; Versió publicada
Publicado en:	Physical review letters, Vol. 109, Issue 15 (October 2012) , p. 151601, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.109.151601

7 p, 117.5 KB

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