Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Flavour physics II

T 31.6: Vortrag

Dienstag, 16. März 2021, 17:15–17:30, Tf

Measurement of the time-integrated mixing parameter χ_d with dilepton tagging using semileptonic B decays at the Belle II experiment — Florian Bernlochner, Jochen Dingfelder, •Stephan Duell, and Peter Lewis for the Belle II collaboration — Rheinische Friedrich-Wilhelms-Universität Bonn

We present the current status of an analysis of inclusive semileptonic B decays with electrons in the final state and an early dataset of about 36.4 fb⁻¹ of integrated luminosity, which was recorded by the Belle II experiment in 2019 and 2020. The analysis aims to measure the time-integrated mixing parameter of the neutral B meson, χ_d, by exploiting the charge-flavour correlation between the B meson and the electron in inclusive semileptonic B → X e ν_e decays. A double tag strategy is employed where two electron candidates are reconstructed and the prompt semileptonic contribution is determined by a fit to the lepton momentum spectrum. The resulting yields can be separated into same-sign and opposite-sign events, which allows the direct determination of χ_d. The current status of the analysis will be presented in this talk.