High temperature CP-restoring phase transition at theta = pi

J.K. Boomsma, D. Boer

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    The CP-restoring phase transition at θ=π and high temperature is investigated using two related models that aim to describe the low-energy phenomenology of QCD, the Nambu-Jona-Lasinio (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 nonanalytic vacuum term at zero temperature that is present in the NJL model, but usually not included in the linear sigma model. Because of the absence of explicit CP violation, this term always alters the qualitative aspects of the high temperature phase transition at θ=π, just as for θ=0 in the chiral limit. © 2009 The American Physical Society.
    Original languageEnglish
    JournalPhysical Review D
    Volume80
    Issue number3
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Times Cited: 1

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