Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 84: Flavour Physics

T 84.8: Vortrag

Donnerstag, 24. März 2022, 18:00–18:15, T-H15

Measuring kinematic distributions of B → D^* ℓ ν_ℓ with hadronic tagging at Belle II — Florian Bernlochner, Jochen Dingfelder, •Michael Eliachevitch, Michael Hedges, Peter Lewis, Markus Prim, and William Sutcliffe — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

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 (SM).

This talk presents early results and analysis plans for the B → D^* ℓ ν_ℓ decay with ℓ denoting the light leptons e and µ. Its high branching fraction and ease of reconstruction allow to use available Belle II data for differential measurements of the shapes describing the decay kinematics. These are sensitive to the |V_cb| CKM matrix-element and to the form-factors describing the interactions of the hadronic current. Based on these shapes we can further measure angular observables such as the forward-backward asymmetry A_FB to probe the SM. In the presented analysis 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 the resulting high purity and good resolution this serves as an important cross-check of similar measurements using an inclusive tagging approach.