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- W4297665715 abstract "We resume a long-standing, yet not forgotten, debate on whether a Chern-Simons birefringence can be generated by a local term $b_mubarpsigamma^mu gamma_5psi$ in the Lagrangian (where $b_mu$ are constants). In the present paper we implement a new way of managing $gamma_5$ in dimensional regularization. Gauge invariance in the underlying theory (QED) is enforced by this choice of defining divergent amplitudes. We investigate the singular behavior of the vector meson two-point-function around the $m^2=0$ and $p^2=0$ point. We find that the coefficient of the effective Chern-Simons can be finite or zero. It depends on how one takes the limits: they cannot be interchanged due to the associate change of symmetry. For $m^2=0$ we evaluate also the self-mass of the photon at the second orderin $b_mu$. We find zero." @default.
- W4297665715 created "2022-09-30" @default.
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- W4297665715 date "2015-10-15" @default.
- W4297665715 modified "2023-09-25" @default.
- W4297665715 title "On effective Chern-Simons Term induced by a Local CPT-Violating Coupling using $gamma_5$ in Dimensional Regularization" @default.
- W4297665715 doi "https://doi.org/10.48550/arxiv.1510.04666" @default.
- W4297665715 hasPublicationYear "2015" @default.
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