$Zγγγ\to 0$ processes in SANC

Abstract

In this paper we describe the analytic and numerical evaluation of the $γγ\to γZ$ process cross section and the $Z\to γγγ$ 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.

14 pages, 6 figures