Monte-Carlo Generator Photon Jets for the process e+e- -> gamma gamma

TL;DR

This paper presents a Monte-Carlo generator for the process e+e- -> gamma gamma, incorporating photon jet radiation and radiative corrections with high precision, aiding luminosity measurements in collider experiments.

Contribution

It introduces a detailed Monte-Carlo generator including photon jets and exact first-order radiative corrections, with all-order leading logarithmic effects via the Structure Function approach.

Findings

Theoretical cross section precision estimated at 0.2%.

Generator effectively models photon jets in collinear regions.

Applicable for luminosity measurements at VEPP-2000.

Abstract

Monte-Carlo generator with photon jets radiation in collinear regions for the process \eegg is described in detail. Radiative corrections in the first order of $\alpha$ are treated exactly. Large leading logarithmic corrections coming from collinear regions are taken into account in all orders of $\alpha$ by applying the Structure Function approach. Theoretical precision of the cross section with radiative corrections is estimated to be 0.2%. This process is considered as an additional tool to measure luminosity in forthcoming experiments with the CMD-3 detector at the $e^+e^-$ collider VEPP-2000.