September 27, 2021 to October 1, 2021
Indiana University
America/Indiana/Indianapolis timezone

Monte Carlo Event Generator updates with tau pair events at Belle II energies

Sep 29, 2021, 2:45 PM
Virtual (Indiana University)


Indiana University

Oral contribution Tau2021 Abstracts Session 5a: Proton-proton and e+e- colliders


Zbigniew Andrzej Was (Polish Academy of Sciences (PL))


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
with emission of additional light lepton pairs. The phase-space and matrix
element parts are separated, that is why extension is useful for
processes where lepton pair is produced through narrow resonances,
like dark photon or dark scalar candidates.

List of tau decays is enriched with multitude of exotic decay channels useful for
new physics searches. The hadronic currents parameterizations 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.

Programs are now available in stand-alone format or through the Basf2 system of
Belle II software as well.

Primary authors

Swagato Banerjee (University of Louisville (US)) Zbigniew Andrzej Was (Polish Academy of Sciences (PL))

Presentation materials