Chiral perturbation theory analysis of baryon temperature mass shifts

Abstract

We compute the finite temperature pole mass shifts of the octet and decuplet baryons using heavy baryon chiral perturbation theory and the 1/N_c expansion, where N_c is the number of QCD colors. We consider temperatures of the order of the pion mass m_π, and truncate the chiral and 1/N_c expansions assuming that m_π\sim 1/N_c. There are three scales in the problem: the temperature T, the pion mass m_π, and the octet--decuplet mass difference. Therefore, the result is not simply a power series in T. We find that the nucleon and Δtemperature mass shifts are opposite in sign, and that their mass difference changes by 20% in the temperature range 90 MeV < T < 130 MeV, that is the range where the freeze out in relativistic heavy ion collisions is expected to occur. We argue that our results are insensitive to the neglect of 1/N_c- supressed effects; the main purpose of the 1/N_c expansion in this work is to justify our treatment of the decuplet states.