The high temperature CP-restoring phase transition at theta = pi

Details The high temperature CP-restoring phase transition at theta = pi The high temperature CP-restoring phase transition at theta = pi

2009-05-28

arxiv.org/abs/0905.4660v3

Phys.Rev.D80:034019,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 1 eps figure; corrected various typos, added missing term in Eq. (13), conclusions unchanged, minor revisions to Sec

Scientific paper

10.1103/PhysRevD.80.034019

The CP-restoring phase transition at theta = pi and high temperature is investigated using two related models that aim to describe the low-energy phenomenology of QCD, the NJL model and the linear sigma model coupled to quarks. Despite many similarities between the models, different predictions for the order of the phase transition result. Using the Landau-Ginzburg formalism, the origin of this difference is traced back to a non-analytic vacuum term at zero temperature that is present in the NJL model, but usually not included in the linear sigma model. Due to the absence of explicit CP violation, this term always alters the qualitative aspects of the high temperature phase transition at theta = pi, just as for theta = 0 in the chiral limit.

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