Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 7: Flavour physics V
T 7.1: Talk
Monday, March 15, 2021, 16:00–16:15, Tg
Hadronically tagged B→ D(*)ℓνℓ with Belle II — Florian Bernlochner1, Racha Cheaib2, Jochen Dingfelder1, •Michael Eliachevitch1, Max Graf1, Markus Prim1, William Sutcliffe1, and Hannah M. Wakeling3 for the Belle II collaboration — 1Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn — 2Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany — 3McGill University, Montréal, Québec, H3A 2T8, Canada
The analysis of semileptonic B meson decays is one of the main pillars of the physics program of the Belle II experiment, since their theoretical cleanliness enables precise theoretical predictions which can be compared with measurements for tests of the Standard Model of particle physics. This talk presents early results and analysis plans for the B → D(*) ℓ νℓ decay with ℓ denoting the light leptons e and µ. The other B meson originating from the Υ(4S) is fully reconstructed in hadronic decay modes via the Full Event Interpretation tagging algorithm, providing the full four-momentum of the signal B meson. Due to its high branching fraction and ease of reconstruction, this decay allows for early measurements on available Belle II data. A good understanding of this channel on observed data and discrepancies to simulated data is essential in the context of future measurements of the lepton flavour universality probing R(D(*)) observable, which measures the ratio of semitauonic B → D(*) τ ντ decays to the B → D(*) ℓ νℓ channel as a normalization. Furthermore, it is of interest due to its sensitivity to the magnitude of the Vcb CKM matrix element.