Lorentz-violating effects on pair production of W bosons in photon collisions

摘要

We examine Lorentz-violating effects that could appear through deviations ofthe Standard Model gauge couplings WWgamma and WWgammagamma. These new physicseffects are explored on the gamma gamma -> WW reaction at the InternationalLinear Collider. In particular, the associated helicity amplitudes are computedin the context of the Standard Model Extension (which is a model-independentapproach to CPT and Lorentz violation) and the Effective Lagrangian Model(which incorporates new physics effects that respect CPT and Lorentzviolation). We perform an exhaustive study of the polarized differential crosssections to stand out effects related to Lorentz symmetry violation, where itis evidenced that the effects of Lorentz symmetry violation are more sensitiveto the presence of the b constant background field. We found that for the$(\pm,\pm,(L,T+T,L))$ polarization state, only Standard Model Extension andEffective Lagrangian Model contribute at the lowest order, however, both typesof new physics effects are clearly distinguished, being dominant the convolutedcross section of the Standard Model Extension in around 4 orders of magnitude.For this polarization state, at the last stage of operation of InternationalLinear Collider, it is expected an integrated luminosity of 10^3 fb^{-1},finding around of 2 events for a Lorentz-violating energy scale of 32 TeV.