000002668 001__ 2668
000002668 005__ 20210910173022.0
000002668 037__ $$aBELLE2-TALK-CONF-2021-104
000002668 041__ $$aeng
000002668 088__ $$aBELLE2-TALK-DRAFT-2021-113
000002668 100__ $$aThomas Kraetzschmar
000002668 245__ $$aTau physics prospects at Belle II
000002668 260__ $$a22nd Particles and Nuclei International Conference$$c2021-09-05
000002668 300__ $$amult. p
000002668 520__ $$aThe Belle~II experiment is a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric $e^+e^-$-collider. The design luminosity of the machine is $8~\times~10^{35}~\text{cm}^{2}\text{s}^{-1}$ and the Belle~II experiment aims to record $50~\text{ab}^{-1}$ of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run and main operation of SuperKEKB has started in March 2019. Belle II has a broad $\tau$ physics program, in particular in searches for lepton flavour and lepton number violations, benefiting from the large cross section of the pair wise $\tau$ lepton production in $e^+e^-$ -collisions. We expect that after 5 years of data taking, Belle II will be able to reduce the upper limits on lepton flavour and lepton number violating $\tau$ decays by an order of magnitude. Any experimental observation of lepton flavour or lepton number violations in $\tau$ decays constitutes an unambiguous sign of physics beyond the Standard Model, offering the opportunity to probe the underlying new physics. We also present a first measurement of the $\tau$-mass and the prospects for the $\tau$-lifetime measurement. In this talk we will review the $\tau$ lepton physics program of Belle~II.
000002668 8560_ $$fdjaffe@bnl.gov
000002668 8564_ $$uhttps://docs.belle2.org/record/2668/files/BELLE2-TALK-CONF-2021-104.pdf