arXiv:hep-ph/9803469·v1·High Energy Physics — Phenomenology
Pion-Nucleon coupling at finite temperature
C.A. Dominguez🇿🇦 · C. van Gend🇿🇦 · M. Loewe🇨🇱
Abstract
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.
Comments: 14 pages, Latex2e file, 5 figures appended as 5 separate EPS files. Paper submitted to Phys. Lett. B