Phys. Rev. D 54, 5536–5544 (1996)Nucleons at finite temperatureReceived 18 March 1996; published in the issue dated 1 November 1996 The nucleon mass shift is calculated using chiral counting arguments and a virial expansion, without and with the Δ. At all temperatures, the mass shift and damping rate are dominated by the Δ. Our results are compared with the empirical analysis of Leutwyler and Smilga, as well as results from heavy baryon chiral perturbation theory in the large Nc (number of color) limit. We show that unitarity implies that the concepts of thermal shifts are process dependent. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.54.5536
DOI:
10.1103/PhysRevD.54.5536
PACS:
13.75.Cs, 11.10.Wx, 12.39.Fe, 13.75.Gx
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