Aachen 2019 – scientific program

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T: Fachverband Teilchenphysik

T 63: Flavorphysik II

T 63.10: Talk

Wednesday, March 27, 2019, 18:15–18:30, S15

Measurement of inclusive differential kinematic distributions for |Vub|Florian Bernlochner, Lu Cao, William Sutcliffe, and •Raynette van Tonder — Karlsruhe Institute of Technology, Germany

The discrepancy between inclusive and exclusive measurements of the CKM matrix element |Vub| has posed a longstanding puzzle. Since one of the major difficulties involved with the inclusive |Vub| measurement is the determination of the non-perturbative distribution function describing the internal Fermi motion of the b-quark, innovative new analysis strategies aimed toward reducing model uncertainties have been suggested. One of these approaches proposes to measure key kinematic differential distributions of BXu l ν decays and combine them into a global, data-driven fit, which would simultaneously determine |Vub| as well as other useful parameters. This analysis makes use of hadronic tagging and is performed on the full dataset of the Belle experiment comprising 772 million BB pairs. In order to test analysis techniques under development for the above-mentioned measurement, the more abundant phase space region of BXc l ν decays is exploited. This talk will show the current analysis status as well as differential kinematic distributions for B → Xc l ν decays.

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