Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 3: Flavour Physics 1

T 3.1: Vortrag

Montag, 21. März 2022, 16:15–16:30, T-H16

Measurement of the ratios R(D^(*)) with leptonic τ and hadronic tag at Belle — •Felix Metzner¹, Florian Bernlochner², Michael Feindt¹, and Pablo Goldenzweig¹ for the Belle collaboration — ¹Karlsruhe Institute of Technology — ²University of Bonn

The discrepancy observed for the ratios R(D^(*)) of the decays B → D^(*) τ ν_τ relative to the normalisation modes B → D^(*) ℓ ν_ℓ (ℓ = e, µ) between the experimental results and the Standard Model (SM) prediction is one of 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.