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T: Fachverband Teilchenphysik

T 7: Flavour physics V

T 7.2: Vortrag

Montag, 15. März 2021, 16:15–16:30, Tg

Study on semileptonic B → D^** ℓ ν decays for a R(D^(*)) measurement at Belle — •Patrick Ecker¹, Felix Metzner¹, Florian Bernlochner², and Pablo Goldenzweig¹ — ¹Karlsruher Institut für Technologie — ²Universität Bonn

Measuring the semileptonic ratio R(D^(*)) shows an over 3σ tension to the prediction of the standard model. This tension is still one of the most interesting open questions in flavor physics, which makes a more precise measurement of the ratio desirable. Nevertheless, the precision of the measurement is mainly limited by the insufficient knowledge about the B → D^** ℓ ν background decays.
This study uses the 711 fb⁻¹ dataset provided by Belle to analyse the form factor modeling of these modes, as well as giving ratios of the branching fractions of the D^** decays to the B → D^(*) ℓ ν decays used in the R(D^(*)) analysis.