TAUOLA, TAUOLA universal interface PHOTOS and MC-TESTER: Status Report

TL;DR

This paper reviews the current status of Monte Carlo programs for tau-lepton simulation, highlighting recent practical extensions and testing results that improve their use in high-energy physics experiments.

Contribution

It introduces new features for tau-lepton decay simulations, including automated form-factor management and a prototype universal interface based on HepMC.

Findings

Automated use of multiple form-factor versions for fits.

New tests for QED bremsstrahlung in W decays.

Prototype HepMC interface tested with MC-TESTER.

Abstract

The status of Monte Carlo programs for the simulation of tau-lepton production and decay in high-energy accelerator experiments is reviewed. No basic changes in the organization of the programs were necessary since the previous tau-lepton conference in 2006. Minor in size, but practical, extensions for the use of the programs in high precision mixed languages environments are being introduced: (i) For the TAUOLA Monte Carlo generator of tau-lepton decays, automated and simultaneous use of many versions of form-factors for the calculation of optional weights for fits was discussed. A pilot example of its use was presented. (ii) New tests for PHOTOS Monte Carlo for QED bremsstrahlung in W decays were shown. (iii) Prototype version of the TAUOLA universal interface based on HepMC (the C++ event record) was mentioned. Its tests with the help of MC-TESTER were discussed. Presented results illustrate the status of the projects performed in collaboration with Vladimir Cherepanov, Nadia Davidson, Piotr Golonka, Gizo Nanava, Tomasz Przedzinski Elzbieta Richter-Was and others.