Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 32: Flavour physics VI

T 32.9: Talk

Tuesday, March 16, 2021, 18:00–18:15, Tg

Search for the lepton flavour violating decay B⁰ → τ^± ℓ^∓ — Thomas Kuhr, Thomas Lück, and •Nathalie Eberlein — Ludwig-Maximilians-Universität, München

Lepton flavour is conserved in the Standard Model, but violated in many new physics models. An observation of the B⁰ → τ^± ℓ^∓ decay, where ℓ= e/ µ, would be a clear sign for new physics.

At B factories one can determine the kinematics of the signal B meson by fully reconstructing the accompanying B meson in e⁺ e⁻ → Υ(4S) → B B events. In the rest frame of the signal B meson the mono-energetic lepton provides a clean signature to identify the signal B⁰ → τ^± ℓ^∓ decays.

This talk presents the current status of the search for B⁰ → τ^± ℓ^∓ decays with Belle data using the Full Event Interpretation algorithm for the reconstruction of the accompanying B meson.