Repercussions of dimension five nonminimal couplings in the electroweak model

Abstract

We propose two possibilities of CPT-odd, dimension five and Lorentz-violating (LV) nonminimal couplings in the Electroweak model. These gauge-invariant terms couple a fixed LV 4-vector to the electroweak field strengths. After finding the LV contributions to the electroweak currents, we evaluate the decay rate for the vector mediators W and Z. Using the known experimental uncertainty in these decay rates, upper bounds at the level of 10−15 (eV)−1 and 10−14 (eV)−1 are imposed on the magnitude of the proposed nonminimal interactions.