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

摘要

We examine Lorentz-violating effects that could appear through deviations of the Standard Model gauge couplings WW gamma, WW gamma gamma, Z gamma gamma and gamma gamma gamma. These new physics effects are explored on the gamma gamma -> WW reaction at possible future Linear Colliders. In particular, the associated helicity amplitudes are computed in the context of the Standard Model Extension (which is a model that includes Lorentz violation) and the Effective Lagrangian Model (which incorporates new physics effects that respect Lorentz symmetry). We perform an exhaustive study of the polarized differential cross-sections to stand out effects related to Lorentz symmetry violation, where it is evidenced that the effects of Lorentz symmetry violation are more sensitive to the presence of the e background field. We found that for the (+/-, +/-, (L, T + T, L)) polarization state, only Standard Model Extension contributes at the lowest order. For this polarization state, with an integrated luminosity assumed to be 10(3) fb(-1), we estimated up to 1 event for a Lorentz-violating energy scale of 44 TeV.