Spontaneous CP violation in the NJL model at theta = pi

D. Boer, J.K. Boomsma

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    As is well-known, spontaneous CP-violation in the strong interaction is possible at θ = π, which is commonly referred to as Dashen's phenomenon. This phenomenon has been studied extensively using chiral Lagrangians. Here the two-flavor NJL model at θ = π is discussed. It turns out that the occurrence of spontaneous CP-violation depends on the strength of the 't Hooft determinant interaction, which describes the effect of instanton interactions. The dependence of the phase structure, and in particular of the CP-violating phase, on the quark masses, temperature, baryon and isospin chemical potential is examined in detail. The latter dependence shows a modification of the charged pion condensed phase first discussed by Son and Stephanov. © 2009 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)251C-254C
    JournalNuclear Physics A
    Publication statusPublished - 2009

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