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Monte Carlo Event Generator updates, for tau pair events at Belle II energies
by Sw. Banerjee, D. Biswas, T. Przedzinski, Z. Was
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Submission summary
| Authors (as registered SciPost users): | Zbigniew Andrzej Was |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2111.05914v2 (pdf) |
| Date accepted: | June 24, 2025 |
| Date submitted: | Dec. 3, 2024, 9:42 a.m. |
| Submitted by: | Was, Zbigniew Andrzej |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 16th International Workshop on Tau Lepton Physics (TAU2021) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Computational, Phenomenological |
Abstract
The Monte Carlo for lepton pair production and tau decays consist of KKMC for lepton pair production, tauola for tau lepton decays and photos for radiative corrections in decays. An effort for adaptation of the system for precision data to be collected at Belle II experiment lead to extension of phase space generation modules both in photos and tauola to enable decays and/or radiative corrections of additional light lepton pairs. The phase-space and matrix element parts of the programs are separated, that is why extension to processes where lepton pair is produced through narrow resonances, like dark photon, was straight forward. In the present version of tauola, list of tau decay channels is enriched with multitude of exotic ones, useful for searches of new physics. The hadronic currents parametrizations of main decay channels is prepared for basic simulation in the experiment. The basis for future work on precise fits of hadronic currents including Machine Learning is retained, but development of necessary software solutions is left for the forthcoming years. Presented programs versions are available in stand-alone format from gitlab or through the basf2 system of Belle II software. Official distribution web pages, documenting programs tests, are retained but not necessarily up to the date.
Published as SciPost Phys. Proc. 16, 003 (2025)
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A notable part of the contribution concerns improvements to the phase space generation modules in both PHOTOS and TAUOLA, which now allow the inclusion of additional light lepton pairs, and which is an important capability for studying scenarios involving light new physics particles. The authors also summarize the implementation of new tau decay modes in TAUOLA involving such hypothetical light dark sector states.
In addition, the paper documents various cross checks of their simulation setup, showing good agreement between their generators and MadGraph, which adds confidence to the robustness of the implementations.
Overall, this is a useful summary of ongoing developments in tools that are widely used within the tau physics and broader collider physics communities.
The paper is of interest to a fairly broad audience and merits publication.
I recommend publication in its current form.
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