PHOTOS Monte Carlo and its theoretical accuracy

TL;DR

The paper reviews the PHOTOS Monte Carlo program, highlighting its theoretical foundations, implementation constraints, and importance of reliability in simulating bremsstrahlung corrections in particle decays for high energy physics experiments.

Contribution

It provides a comprehensive review of the PHOTOS Monte Carlo program's theoretical accuracy, implementation details, and reliability considerations, emphasizing its widespread use in high energy physics.

Findings

PHOTOS accurately models bremsstrahlung corrections in particle decays.

Implementation of channel-specific matrix elements enhances simulation reliability.

The program's design enables widespread use in high energy physics experiments.

Abstract

Because of properties of QED, the bremsstrahlung corrections to decays of particles or resonances can be calculated, with a good precision, separately from other effects. Thanks to the widespread use of event records such calculations can be embodied into a separate module of Monte Carlo simulation chains, as used in High Energy Experiments of today. The PHOTOS Monte Carlo program is used for this purpose since nearly 20 years now. In the following talk let us review the main ideas and constraints which shaped the program version of today and enabled it widespread use. Finally, we will underline importance of aspects related to reliability of program results: event record contents and implementation of channel specific matrix elements.