Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 9: Flavor physics: Lepton universality tests I

T 9.2: Talk

Monday, March 30, 2020, 16:45–17:00, H-HS X

Measurement of the ratios R(D^(*)) at Belle using the Belle II software — Florian Bernlochner², Michael Feindt¹, Pablo Goldenzweig¹, •Felix Metzner¹, and Maximilian Welsch² — ¹Karlsruher Institut für Technologie — ²Rheinische Friedrich-Wilhelms-Universität Bonn

The discrepancy observed for the ratios R(D^(*)) of the decays B → D^(*) τ ν relative to the normalisation modes B→D^(*)ℓν (ℓ = e, µ) between the experimental results and the Standard Model (SM) prediction is one of a few longstanding tensions of the SM. 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 (FEI) — is carried out. Profiting from a 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.