Bonn 2020 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 51: Flavor physics: CKM I
T 51.5: Vortrag
Mittwoch, 1. April 2020, 17:30–17:45, H-HS XI
Untagged B0 → D*+ ℓ− νℓ studies with Belle II — Florian Bernlochner, Lu Cao, Jochen Dingfelder, and •Chaoyi Lyu — The University of Bonn, Bonn, Germany
The precise determination of the CKM matrix element |Vcb| and semileptonic form factors in B meson decays are important for carrying out precision tests of the flavour sector of the Standard Model and to search for new physics. The decay of B0 → D*+ ℓ− νℓ is particularly well suited to determine |Vcb| due to its large branching fraction, small backgrounds and the availability of lattice data to describe the form factors. In this talk I will present the current status of establishing an untagged measurement of the B0 → D*+ ℓ− νℓ branching fraction and form factors. In particular, I will show results using first Belle II data and present detailed comparisons between simulated and recorded B0 → D*+ ℓ− νℓ decays.