Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 6: Flavour physics I

T 6.4: Vortrag

Montag, 15. März 2021, 16:45–17:00, Tf

First Results and Prospects for τ → e + α (invisible) at Belle II — •Thomas Kraetzschmar for the Belle II collaboration — Max-Planck-Insitut für Physik (Werner-Heisenberg-Insitut), München, Deutschland

The Belle II experiment at SuperKEKB, an asymmetric e+e collider, aims at a total integrated luminosity of 50 ab−1, to pursue a rich program of Standard Model and Beyond the Standard Model physics. Until the end of 2020 and beginning of 2021 about 100 fb−1 were collected at the Υ(4S) resonance. This results in a sizeable sample of τ pairs, enabling detailed studies of Standard and Beyond the Standard Model measurements, including searches for Lepton Flavor Violating (LFV) decays. One of the first channels where competitive limits are expected is the τ → e + α (invisible) process, where α is a Goldstone boson. Here, the currently best limit has been obtained by ARGUS with an integrated luminosity of 475 pb−1. Belle II is expected to be able to improve on this result already with the data recorded. This contribution will discuss the expected reach of the measurements with the current data set, and the progress towards a new upper limit.

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