CP-Violation in Low-Energy Photon-Photon Interactions

Details CP-Violation in Low-Energy Photon-Photon Interactions CP-Violation in Low-Energy Photon-Photon Interactions

2008-11-28

arxiv.org/abs/0811.4689v3

Phys.Rev.D79:065020,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 2 figures. New results added. Definitive version, published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.79.065020

CP-violation in the loop-mediated photon-photon interactions would modify the birefringence of the quantum vacuum. We discuss the implications of this effect on the PVLAS-Phase II experiment, in which a time-dependent magnetic field is modulated. We show that the violation of CP would imply the existence of characteristic Fourier components, in the intensity spectrum of the outgoing wave. In order to estimate the magnitude of this effect within the Standard Model, we use chiral perturbation theory to compute the theta-term contribution to the coefficient of the leading CP-odd vertex, in the low-energy effective field theory for photon dynamics.

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