Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 102: Flavour physics 4

T 102.3: Talk

Thursday, March 7, 2024, 16:30–16:45, Geb. 30.41: HS 4

Search for B⁺ → K^*+ττ with Hadronic Tagging at Belle II — •Lennard Damer, Torben Ferber, and Pablo Goldenzweig — Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)

In recent years, intriguing hints for violation of lepton flavor universality have been accumulated in semileptonic B decays with the help of multiple experiments.

The flavor-changing neutral current process b → s  τ⁺τ⁻ is particularly sensitive to New Physics models which only couple to the third generation, or with 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 experimental range of the Belle II experiment.

This talk presents the status of the first search for B⁺ → K^*+ττ decays, where hadronic tagging is employed. By this, the corresponding B meson partner in Υ(4S) decays is reconstructed in a variety of hadronic decay chains to increase the selection purity.

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