Tau and low multiplicity decays at Belle and Belle II

Sumitted to PubDB: 2024-03-11

Category: Talk, Visibility: Public

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Authors	Stefan Wallner
Date	Feb. 18, 2024
Belle II Number	BELLE2-TALK-CONF-2024-034
Abstract	Belle and its successor, the Belle II experiment at the KEK accelerator facility in Japan, measured large data sets of tau pair production. By applying innovative analysis techniques, we have obtained world-leading results from these data for precision measurements of the tau and Standard Model parameters, and for the search for physics beyond the Standard Model. In addition, special triggers designed to record events with low track multiplicity allow us to perform dart sector searches with unprecedented precision. In this talk we will report on the precision measurement of the tau mass and the partial wave decomposition in $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ decays, the search for lepton flavor violation in tau decays, and the search for a dark $Z` in different final states.
Conference	Lake Louise Winter Institute 2024