Radiation Zeros as an Observable to test Physics beyond the Standard Model

TL;DR

This paper investigates radiation zeros in high-energy $q ar q o W^+W^- \gamma$ processes, demonstrating their potential to reveal physics beyond the Standard Model through sensitive measurements of anomalous couplings.

Contribution

It provides a detailed analysis of radiation zeros in a specific process and highlights their usefulness as an observable for detecting new physics beyond the Standard Model.

Findings

Deep dips in cross section correspond to radiation zeros.

Sensitivity to anomalous quartic couplings is significantly enhanced near zeros.

Radiation zeros can serve as a powerful test for new physics.

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. 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.