Speaker
Description
Extensions of the Standard Model (SM) with new Abelian
gauge groups allow for kinetic mixing between the new gauge bosons and the
hypercharge gauge boson, resulting in mixing with the photon. In many models the
mixing with the hypercharge gauge boson captures only part of the kinetic mixing
term with the photon, since the new gauge bosons can also mix with the neutral
component of the $SU(2)_L$ gauge bosons. We take these contributions into
account and present a consistent description of kinetic mixing for general Abelian
gauge groups both in the electroweak symmetric and the broken phase. These
contributions are relevant for all hidden photon models in which SM fermions are
charged, like $U(1)_{B-L}, U(1)_{L_i-L_j}$, etc. Based on these results we derive a
low-energy theorem for the couplings of novel Abelian gauge bosons with the
Standard Model Higgs boson from the one-loop kinetic mixing amplitudes.
