Pion-Nucleon coupling at finite temperature

Details Pion-Nucleon coupling at finite temperature Pion-Nucleon coupling at finite temperature

1998-03-27

arxiv.org/abs/hep-ph/9803469v1

Phys.Lett. B429 (1998) 64-71

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, Latex2e file, 5 figures appended as 5 separate EPS files. Paper submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)00453-5

The pion nucleon vertex function at finite temperature is studied in the framework of: (a) the thermal (linear) sigma model to leading (one-loop) order, and (b) a thermal QCD-Finite Energy Sum Rule. Results from both methods indicate that the strength of the pion-nucleon coupling decreases with increasing T, vanishing at a critical temperature. The associated mean-square radius is a monotonically increasing function of T, diverging at the critical temperature. This is interpreted as (analytical) evidence for the quark-gluon deconfinement phase transition.

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