Soft Photon Radiation in Particle Decays in SHERPA

TL;DR

This paper introduces a Monte Carlo implementation of the Yennie-Frautschi-Suura approach for simulating soft photon radiation in particle decays, enhancing the accuracy of QED correction modeling within the SHERPA event generator.

Contribution

It presents a systematic Monte Carlo method based on the YFS approach for simulating soft photon radiation in particle decays, integrated into SHERPA.

Findings

Accurately models real and virtual QED corrections in decays.

Resums leading logarithmic QED corrections to all orders.

Allows correction to fixed order perturbative results.

Abstract

In this paper the Yennie-Frautschi-Suura approach is used to simulate real and virtual QED corrections in particle decays. It makes use of the universal structure of soft photon corrections to resum the leading logarithmic QED corrections to all orders, and it allows a systematic correction of this approximate result to exact fixed order results from perturbation theory. The approach has been implemented as a Monte Carlo algorithm, which a posteriori modifies decay matrix elements through the emission of varying numbers of photons. The corresponding computer code is incorporated into the SHERPA event generator framework.