Speaker
Kimiko Yamashita
(Ochanomizu University)
Description
We consider a dark matter model where a dark matter candidate couples to photons via an extra U(1) mediator and
assume that this dark matter candidate is a fermion and can couple to the mediator with parity violation.
We derived a low energy effective Lagrangian including a parity violated term for light-by-light scattering by integrating out the dark matter fermion.
Our focus lies on Vacuum Magnetic Birefringence Experiment to probe the dark sector.
We propose the ring resonator (3-4 mirrors) with an appropriate polarization state of light in stead of a usual Fabry-Perot resonator (2 mirrors) with a conventional polarization state of light to measure the Parity violated term. We assume that a dark neutrino is a dark matter, i.e. V-A current, and give constraints on model parameters from a current experimental limit.
PTEP 2017 no. 12, 123B03 (2017) (arXiv:1707.03308 [hep-ph]), arXiv:1707.03609 [hep-ph]
