Eur. Phys. J. C (2020) 80: 330
https://doi.org/10.1140/epjc/s10052-020-7898-6

Special Article – Tools for Experiment and Theory

Particle event generator: a simple-in-use system PEGASUS version 1.0

¹ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, Moscow, Russia
² Joint Institute for Nuclear Research, 141980, Dubna, Moscow Region, Russia
³ P.N. Lebedev Physics Institute, 119991, Moscow, Russia

^* e-mail: lipatov@theory.sinp.msu.ru

Received: 19 December 2019
Accepted: 1 April 2020
Published online: 20 April 2020

Abstract

pegasus is a parton-level Monte-Carlo event generator designed to calculate cross sections for a wide range of hard QCD processes at high energy pp and collisions, which incorporates the dynamics of transverse momentum dependent (TMD) parton distributions in a proton. Being supplemented with off-shell production amplitudes for a number of partonic subprocesses and provided with necessary TMD gluon density functions, it produces weighted or unweighted event records which can be saved as a plain data file or a file in a commonly used Les Houches Event format. A distinctive feature of the pegasus is an intuitive and extremely user friendly interface, allowing one to easily implement various kinematical cuts into the calculations. Results can be also presented “on the fly” with built-in tool pegasus plotter. A short theoretical basis is presented and detailed program description is given.