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Mixing interactions and effects in the NJL-model

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arxiv 2501.07658 v3 pith:IZHYOUY7 submitted 2025-01-13 hep-ph nucl-th

Mixing interactions and effects in the NJL-model

classification hep-ph nucl-th
keywords interactionsmixingeffectsquark-antiquarkflavorinducedpolarizationsymmetry
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The flavor-dependent quark-antiquark contact interactions, induced by vacuum polarization and recently derived for flavor U(3) Nambu-Jona-Lasinio model, are articulated with the resulting mixing effects emerging from flavor symmetry breaking in view. The formal effects of the explicit mixing interactions, $G_{i\neq j}$, are detailed firstly for the meson mixing problem without the inclusion of 't Hooft interactions induced by instantons. Secondly, it is shown that these mixings, in the scalar channel of quark-antiquark interactions, might give rise to quark mixing in the gap equations. Sixth order quark-antiquark interactions from vacuum polarization, that break $U_A(1)$ symmetry, also contribute.

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Cited by 1 Pith paper

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  1. Effects of flavor-mixings on charged kaon and pion parton distribution functions

    hep-ph 2026-07 conditional novelty 4.0

    Vacuum-polarization flavor mixing in the U(3) NJL model produces small, mass-difference-driven shifts in charged pion and kaon valence PDFs that mildly improve agreement with data at 4 and 27 GeV².