Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 30: Flavour Physics 3
T 30.7: Vortrag
Dienstag, 22. März 2022, 17:45–18:00, T-H15
First Results and Prospects for τ → ℓ + 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 the beginning of 2021, 62.8 fb−1 were collected at the Υ(4S) resonance. This data set 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 → ℓ + 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 will improve on this result with the recorded data. This contribution will discuss the first results of this search.