Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 51: Flavor physics: CKM I
T 51.3: Talk
Wednesday, April 1, 2020, 17:00–17:15, H-HS XI
Precision measurement of the CKM matrix element Vcb with the Full Event Interpretation at Belle — •Markus Prim1, Florian Bernlochner2, Jochen Dingfelder2, Pablo Goldenzweig1, Thomas Kuhr3, Kilian Lieret3, Felix Metzner1, and Maximilian Welsch2 — 1Karlsruher Institut für Technologie — 2Rheinische Friedrich-Wilhelms-Universität Bonn — 3Ludwig Maximilian Universität
Precision measurements of the CKM matrix element Vcb can be done using three established methods: either by studying exclusive B → D ℓ ν decays, exclusive B → D* ℓ ν decays or by studying inclusive b → c ℓ ν transitions. Exclusive and inclusive determinations show a persistent tension at the 2 - 3 sigma level. In recent measurements the dependence of the used exclusive form factor parametrizations was explored as a possible source of the discrepancy. In this presentation we show the status of re-analyzing the full Belle data set of 711/fb of integrated luminosity using an improved hadronic tagging algorithm called the Full Event Interpretation (FEI). Semileptonic B → D ℓ ν and B → D* ℓ ν decays are reconstructed and simultaneously analyzed to measure form factors and Vcb. The fit is carried out in the HAMMER framework, which provides predictions for all relevant form factor parameterizations, and fully differentially in the recoil parameter w and the three D* decay angles.