QCD sum rule determination of the axial-vector coupling of the nucleon at finite temperature

Dominguez, C. A.; van Gend, C; Loewe, M.


A thermal QCD Finite Energy Sum Rule (FESR) is used to obtain the temperature dependence of the axial-vector coupling of the nucleon, gA(T). We find that gA(T) is essentially independent of T, in the very wide range 0 ? T ? 0.9Tc, where Tc is the critical temperature. While gA at T = 0 is q2-independent, it develops a q2 dependence at finite temperature. We then obtain the mean square radius associated with gA and find that it diverges at T = Tc, thus signalling quark deconfinement. As a byproduct, we study the temperature dependence of the Goldberger-Treiman relation. © 1999 Published by Elsevier Science B.V. All rights reserved.

Más información

Título de la Revista: PHYSICS LETTERS B
Volumen: 460
Número: 3-4
Editorial: Elsevier
Fecha de publicación: 1999
Página de inicio: 442
Página final: 446
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-4243619702&partnerID=q2rCbXpz