TY - JOUR

T1 - Polyakov loop and the hadron resonance gas model

AU - Megías, E.

AU - Arriola, E. Ruiz

AU - Salcedo, L. L.

PY - 2012/10/9

Y1 - 2012/10/9

N2 - 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) αg αe -Δ α/T, where g α are the degeneracies and Δ α 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 N f=2+1 for temperatures in the range 150MeV<T<190MeV 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. © 2012 American Physical Society.

AB - 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) αg αe -Δ α/T, where g α are the degeneracies and Δ α 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 N f=2+1 for temperatures in the range 150MeV<T<190MeV 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. © 2012 American Physical Society.

UR - https://ddd.uab.cat/record/114163

U2 - https://doi.org/10.1103/PhysRevLett.109.151601

DO - https://doi.org/10.1103/PhysRevLett.109.151601

M3 - Article

VL - 109

M1 - 151601

ER -