Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov
| Summary:
We present the result of a search for the charged-lepton-flavor violating
decay $tau^- to mu^-mu^+mu^-$ using a $424fb^{-1}$ sample of data recorded
by the Belle II experiment at the SuperKEKB $e^{-}e^{+}$ collider. The
selection of $e^{-}e^{+}totau^+tau^-$ events is based on an inclusive
reconstruction of the non-signal tau decay, and on a boosted decision tree to
suppress background. We observe one signal candidate, which is compatible with
the expectation from background processes. We set a $90%$ confidence level
upper limit of $1.9 times 10^{-8}$ on the branching fraction of the taumu
decay, which is the most stringent bound to date.
| Search Query: ArXiv Query: search_query=au:”T. Higuchi”&id_list=&start=0&max_results=3