Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 63: Flavorphysik II

T 63.4: Talk

Wednesday, March 27, 2019, 16:45–17:00, S15

Measurement of the branching fraction of B→ D^**(D^(*)π⁰)ℓ ν in the context of a R(D^(*)) analysis at the Belle experiment — Florian Bernlochner, Pablo Goldenzweig, Felix Metzner, and •Maximilian Welsch — ETP, KIT, Karslruhe

The observed ratios of semi-tauonic decays involving D and D^* mesons, R(D^(*)), are in strong tension with the Standard Model expectation. Recent measurements point to a deviation of about four standard deviations. One of the main backgrounds in the experimental determination are processes from B→ D^**(D^(*)π⁰)ℓ ν, where D^** denotes one of the four 1P excited D meson states. In this work, a direct measurement of these channels is carried out and this talk presents the current status of measuring B(B→ D^**(D^(*)π⁰)ℓ ν) using the full Belle dataset of 772 million BB pairs and a novel hadronic tagging method.