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T: Fachverband Teilchenphysik
T 31: Flavour physics II
T 31.6: Vortrag
Dienstag, 1. April 2025, 17:30–17:45, VG 1.104
Measurement of kinematic moments of semileptonic B-meson decays with the Run 1 data set of Belle II — Florian Bernlochner, •Munira Khan, Markus Prim, and Slavomira Stefkova — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn
The determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| relies on b → c ℓ ¯nuℓ transitions. The inclusive semileptonic process can be described with the Heavy Quark Expansion (HQE). 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. We present the current status of measuring the full set of kinematic moments (q2, MX, Eℓ) within a single analysis, which characterize the semileptonic b → c ℓ ¯nuℓ and b → q ℓ ¯nuℓ transitions using the Run 1 data of the Belle II experiment. This allows for the first time to properly correlate experimental uncertainties between the different moments. In addition, we present preliminary fits for |Vcb| to simulated samples to illustrate the increase in sensitivity of this approach.