We present recent measurements of τ physics at the Belle II experiment at SuperKEKB. Measurements include a test of e−μ lepton flavor universality in τ decays, a search for the lepton flavor violating τ→μμμ decay and a precision measurement of the τ lepton invariant mass. In addition, we present a measurement of the low multiplicity decay cross section σ(e+e−→π+π−π0), a key input in the theoretical prediction of the anomalous magnetic moment of the muon.
@article{arxiv.2405.14537,
title = {Tau and low multiplicity decays at Belle and Belle II},
author = {Philipp Horak},
journal= {arXiv preprint arXiv:2405.14537},
year = {2024}
}