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

TL;DR

This paper investigates how Lorentz-violating effects could influence W boson pair production in photon collisions at the International Linear Collider, highlighting potential observable deviations from the Standard Model due to new physics effects.

Contribution

It provides a comprehensive analysis of Lorentz-violating effects on gamma gamma -> WW reactions using both the Standard Model Extension and Effective Lagrangian Model, distinguishing their contributions and sensitivities.

Findings

Lorentz violation effects are more sensitive to the background field b constant.

Standard Model Extension effects dominate over Effective Lagrangian Model by four orders of magnitude.

Approximately 2 events could be observed at the ILC for a Lorentz-violating scale of 32 TeV.

Abstract

We examine Lorentz-violating effects that could appear through deviations of the Standard Model gauge couplings WWgamma and WWgammagamma. These new physics effects are explored on the gamma gamma -> WW reaction at the International Linear Collider. In particular, the associated helicity amplitudes are computed in the context of the Standard Model Extension (which is a model-independent approach to CPT and Lorentz violation) and the Effective Lagrangian Model (which incorporates new physics effects that respect CPT and Lorentz violation). 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 b constant background field. We found that for the $(\pm,\pm,(L,T+T,L))$ polarization state, only Standard Model Extension and Effective Lagrangian Model contribute at the lowest order, however, both types of new physics effects are clearly distinguished, being dominant the convoluted cross section of the Standard Model Extension in around 4 orders of magnitude. For this polarization state, at the last stage of operation of International Linear 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.