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The Mesonic Fluctuations and Corrections in the Chiral Symmetry Breaking Vacuum

Mei Huang, Pengfei Zhuang, Weiqin Chao

hep-pharXiv:hep-ph/0102305

Abstract

The mesonic quantum fluctuations and their corrections on the chiral condensate and pion polarization function are investigated in the self-consistent scheme of SU(2) Nambu-Jona-Lasinio model by exactly calculating the next-to-leading order (NLO) Feynman diagrams in 1/Nc expansion. While the fluctuations and corrections depend strongly on the meson's three-momentum cut-off ΛM, no chiral symmetry restoration is found since the cancellation between the NLO and the one-quark-loop diagram with quark mass deviated from the mean-field value.

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