Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 123: Flavour physics 5
T 123.5: Talk
Friday, March 8, 2024, 10:00–10:15, Geb. 30.41: HS 2
Measurement of the full set of kinematic moments of semileptonic B-meson decays with the Run 1 data set of Belle II — •Munira Khan, Florian Bernlochner, Jochen Dingfelder, and Markus Prim — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn
The determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| relies on b → c ℓ νℓ transitions. The inclusive semileptonic process can be described with the Heavy Quark Expansion (HQE) and using the operator product expansion the total decay rate can be parameterized with a small number of non-perturbative parameters. These parameters cannot be determined from first principles, but their values are encoded into kinematic moments of the decay rate. In this talk we present the current status of measuring the full set of kinematic moments (q2, MX, Eℓ, nX) within a single analysis, which characterize the semileptonic b → c ℓ νℓ and b → q ℓ νℓ transitions using the Run 1 data of the Belle II experiment. This allows for the first time to properly correlate experimental uncertainties. In addition, we present preliminary fits for |Vcb| to simulated samples to illustrate the increase in sensitivity of this approach.