The gamma gamma to gamma Z process at high energies and the search for virtual SUSY effects

TL;DR

This paper investigates the high-energy process bla bla bla Z in photon collisions, analyzing standard model and supersymmetric contributions to identify potential new physics effects beyond current models.

Contribution

It provides a detailed analysis of helicity amplitudes and observables for bla bla bla Z at high energies, including SUSY effects, to aid in new physics searches.

Findings

SM amplitudes dominated by W loops above 250 GeV

Amplitudes are helicity conserving and nearly imaginary

Process can reveal non-standard effects and new particles

Abstract

We study the helicity amplitudes and the observables of the process $\gamma \gamma \to \gamma Z$ at high energy. As in the case of the $\gamma \gamma \to \gamma\gamma$ process studied before, the relevant diagrams in the standard model (SM) involve $W$, charged quark and lepton loops; while in SUSY we also have contributions from chargino, and charged sfermion or Higgs loop diagrams. Above 250 GeV, the dominant SM amplitudes are themselves dominated by the $W$ loop, and as for $\gamma \gamma \to \gamma \gamma$, they are helicity conserving and almost purely imaginary. We discuss the complementary information provided by $\gamma \gamma \to \gamma Z$ for the identification of possible non standard effects. This process, together with $\gamma \gamma \to \gamma \gamma$, should provide very useful information on the nature of possible new physics particles, above the threshold of their direct production.