Chiral meson masses at finite temperature and density

A. Barducci, R. Casalbuoni, G. Pettini, and R. Gatto
Phys. Rev. D 63, 074002 – Published 23 February 2001
PDFExport Citation

Abstract

The ratio of the sigma mass to the pion mass at finite temperatures and densities provides for a quantitative signal of chiral symmetry breaking. We calculate this ratio by using an extension to finite chemical potential of the field theoretic composite operator formalism as applied to QCD. The calculation is limited to regions of the phase diagram where only quark-antiquark condensates dominate (no quark-quark condensates) and it confirms the expected behaviors. In particular the sigma becomes an essentially stable particle in a narrow region bordering the transition line from broken to restored chirality. This pattern is qualitatively the same both for the region where the transition is of second order as for the region where it is of first order (apart from the discontinuities expected in the latter case).

  • Received 25 September 2000

DOI:https://doi.org/10.1103/PhysRevD.63.074002

©2001 American Physical Society

Authors & Affiliations

A. Barducci, R. Casalbuoni, and G. Pettini

  • Dipartimento di Fisica, Università di Firenze, I-50125 Firenze, Italy
  • Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, I-50125 Firenze, Italy

R. Gatto

  • Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland

References (Subscription Required)

Click to Expand
Issue

Vol. 63, Iss. 7 — 1 April 2001

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×