MUMUG: a fast Monte Carlo generator for radiative muon pair production (a pedagogical tutorial)

Abstract

A fast leading-order Monte Carlo generator for the process $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma$ is described. In fact, using the $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma$ process as an example, we provide a pedagogical demonstration of how a Monte Carlo generator can be created from scratch. The $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma$ process was chosen, since in this case we are not faced with either too trivial or too difficult a task. Matrix elements are calculated using the helicity amplitude method. Monte Carlo algorithm uses the acceptance-rejection method with an appropriately chosen simplified distribution that can be generated using an efficient algorithm. We provide a detailed pedagogical exposition of both the helicity amplitude method and the Monte Carlo technique, which we hope will be useful for high energy physics students.

Comments: 28 pages, uses FEYNMAN.tex file for drawing Feynman diagrams, version to be published in The European Physical Journal Plus