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T: Fachverband Teilchenphysik

T 29: Flavour Physics II

T 29.4: Vortrag

Dienstag, 17. März 2026, 17:00–17:15, KH 01.011

Search for B⁺ → K^*+τ⁺τ⁻ with Hadronic Tagging at the Belle II Experiment — •Lennard Damer, Torben Ferber, and Pablo Goldenzweig — Institute of Experimental Particle Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany

In recent years, hints for violation of lepton flavor universality have been observed in semileptonic B decays by various experiments. The flavor-changing neutral current process b → s τ⁺τ⁻ is particularly sensitive to models which feature large couplings to third generation leptons or couplings proportional to the particle mass. Some theoretical models allow for an increase in the branching fraction of up to three orders of magnitude compared to the Standard Model prediction, which is within the observable range of the Belle II experiment. In this analysis, hadronic tagging is employed where the corresponding B meson partner in Υ(4S) decays is reconstructed in a variety of hadronic decay chains to increase the selection purity. This talk presents the status of the first search for B⁺ → K^*+τ⁺τ⁻ decays along with an estimate on the signal sensitivity.

Keywords: Belle II Experiment; B-Physics; Flavour-changing neutral currents; Rare B Decays; Semileptonic B decays