Date: Jan 16, 2024 15:00 JST-
Place: Kobaashi Hall and Zoom
anguage: English
Speaker: Kenta Uno (KEK)
Title:
Search for tau -> 3mu and test of light-lepton universality in tau
decays at Belle II
Zoom:
topic: IPNS Seminar
https://us02web.zoom.us/j/81258086591?pwd=WVRRdFY5MFlvRDlYM1BSZFluemZyZz09
meeting ID: 812 5808 6591
passcode: 952696
Abstract:
Large number of tau leptons are produced at the SuperKEKB e+e- collider.
The dataset collected by Belle II provides a unique opportunity to study
the tau decays, especially on searches for lepton flavor violating
decays of tau. Recentlly Belle II presented new results on the
charged-lepton-flavor violating decay tau- -> mu- mu+ mu- and on a test
of light-lepton universality between the decays tau- -> mu- nu nubar and
tau- -> e- nu nubar, using the dataset collected in Run 1 (before summer
2022). For tau- -> mu- mu+ mu-, we obtained an upper limit of the
branching fraction of 1.9 x 10^{-8}, which is the most stringent bounds
despite the smaller data set compared to the previous results from Belle
and BaBar.
