Radiation Zeros in W^+W^-\gamma Production at High-Energy Colliders

TL;DR

This paper investigates radiation zeros in W+W- gamma production at high-energy colliders, revealing deep dips in cross sections near zeros and highlighting their potential to detect anomalous couplings.

Contribution

It demonstrates the presence of radiation zeros in W+W- gamma production at high energies and explores their sensitivity to anomalous quartic couplings.

Findings

Deep dips in cross section near radiation zeros for non-soft photons.

Sensitivity to anomalous quartic couplings is significantly enhanced in these regions.

Zeros occur only in the soft-photon limit, unlike similar processes.

Abstract

The vanishing of the cross section for particular points in phase space - radiation zeros - is examined for the process $ q \bar q \to W^+W^- \gamma$ at high energy. Unlike the process $q \bar q' \to W^\pm \gamma$, actual zeros only occur in the soft-photon limit. However, for photon energies that are not too large, the cross section does exhibit deep dips in regions of phase space corresponding to the position of the actual zeros. We show that in these regions the sensitivity to possible anomalous quartic couplings is very large.