Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 63: Flavorphysik II

T 63.5: Talk

Wednesday, March 27, 2019, 17:00–17:15, S15

Measurement of B → D^(*) τ ν via the ratios R(D^(*)) at Belle and under utilisation of the Belle II software — Florian Bernlochner, Michael Feindt, Pablo Goldenzweig, •Felix Metzner, and Maximilian Welsch — ETP, KIT, Karlsruhe

The discrepancy observed for the ratios R(D^(*)) of the decays B → D^(*) τ ν relative to the light lepton modes B → D^(*) ℓ ν (ℓ = e, µ) between the experimental results and the Standard Model predictions is one of the persistent flavour anomalies with a significance of four standard deviations. The new Belle II software framework and the therein included conversion tool B2BII allows to reevaluate the Belle data set of 772 million BB-pairs recorded from 1999 until 2010 using the improved algorithms of the modern framework. With this approach a new measurement of the ratios R(D^(*)) with an improved hadronic tagging algorithm — the Full Event Interpretation — is carried out. Profiting from the higher reconstruction efficiency, due to the new tagging algorithm, this analysis aims to provide new insights into these semileptonic B-decays.

In this talk, the procedure and the current status of the analysis will be presented.