TAUOLA for simulation of tau decay and production: perspectives for precision low energy and LHC applications

TL;DR

This paper reviews updates to the TAUOLA Monte Carlo system for tau decay simulation, highlighting new interfaces, parameterizations, and testing tools that enhance precision and usability for low energy and LHC experiments.

Contribution

Introduces automated form-factor weights, public HepMC interfaces for TAUOLA and PHOTOS, and improved QED bremsstrahlung modeling, advancing tau decay simulation capabilities.

Findings

Automated form-factor weights work in Belle and BaBar environments.

Public HepMC interfaces for TAUOLA and PHOTOS are now available.

Extended PHOTOS for QED bremsstrahlung with first order matrix elements.

Abstract

The status of Monte Carlo system for the simulation of tau-lepton production and decay in high-energy accelerator experiments is reviewed. Since previous tau-lepton conference in 2008 some practical modifications have been 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 developped and checked to work in Belle and BaBar software environment. Work on alternative paramterizations of hadronic decays is advanced. (ii) the TAUOLA universal interface based on HepMC (the C++ event record) is now public. A similar interface for PHOTOS is now also public. (iii) Extension of PHOTOS Monte Carlo for QED bremsstrahlung in decays featuring kernels based on complete first order matrix element are gradually becoming widely available thanks to properites of the new, HepMC based interface. (iv) Tests of the programs systematized with the help of MC-TESTER are now available for FORTRAN and C++ users. Presented here results illustrate the status of the projects performed in collaboration with Nadia Davidson, Piotr Golonka, Gizo Nanava, Tomasz Przedzinski, Olga Shekhovtsova, El zbieta Richter-Was, Pablo Roig, Qingjun Xu and others.