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The Light-by-Light Contribution to the Muon (g – 2) from Lightest Pseudoscalar and Scalar Mesons within Nonlocal Chiral Quark Model

Авторы: Dorokhov A.E., Radzhabov A.E., Zhevlakov A.S.

Журнал: The European Physical Journal C - Particles and Fields

Том: 72

Номер: 11

Год: 2012

Отчётный год: 2012


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Аннотация: The light-by-light contribution from the lightest neutral pseudoscalar and scalar mesons to the anomalous magnetic moment of muon is calculated in the framework of the nonlocal SU(3) x SU(3) quark model. The model is based on chirally symmetric four-quark interaction of the Nambu-Jona-Lasinio type and Kobayashi-Maskawa-'t Hooft U-A(1) breaking six-quark interaction. Full kinematic dependence of vertices with off-shell mesons and photons in intermediate states in the light-by-light scattering amplitude is taken into account. The small positive contributions from the scalar mesons stabilize the total result with respect to change of model parameters and reduces to alpha(LbL,PS+S)(mu) = (6.25 +/- 0.83).10(-10).

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