$Z\gamma\gamma\gamma\to 0$ processes in SANC

TL;DR

This paper presents an analytic and numerical study of the $ ext{γγ} o ext{γ} Z$ process and the $Z o ext{γ} ext{γ} ext{γ}$ decay rate at one-loop level using the SANC system, including mass effects, with a new computational package.

Contribution

It introduces a comprehensive approach within the SANC system for calculating these processes at one-loop accuracy, including a new numerical package and validation against other methods.

Findings

Validated calculations of the process cross section and decay rate.

Provided a new computational package for these calculations.

Confirmed results through comparison with independent methods.

Abstract

In this paper we describe the analytic and numerical evaluation of the $\gamma\gamma\to \gamma Z$ process cross section and the $Z\to \gamma\gamma\gamma$ decay rate within the SANC system multi-channel approach at the one-loop accuracy level with all masses taking into account. The corresponding package for numeric calculations is presented. For checking of the results correctness we make a comparison with other independent calculations.