Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 73: Flavour Physics IV
T 73.9: Vortrag
Donnerstag, 3. April 2025, 18:15–18:30, VG 1.103
Measurement of the efficiency and the partial branching fraction in a B Meson to Xc inclusive semileptonic Decay for the different q2 (squared momentum transfer) with Belle II data — •Rajeshwari Roy, Munira Khan, Florian Bernlochner, and Markus Prim — Physikalische Institut der Rheinische Friedrich-Wilhelms- Universität Bonn, Nussallee 12, 53115, Bonn
The study of B-meson decays into charmed hadronic states (Xc) accompanied by a lepton and neutrino (B → Xc ℓ ν) provides crucial insights into the dynamics of weak interactions and the structure of the Standard Model. This project focuses on the measurement of the partial branching fraction for B → Xc ℓ ν for different kinematic regions defined by cuts on the squared momentum transfer, q2. A detailed event selection strategy is employed, leveraging kinematic constraints (moments: q2, MX) The use of multivariate techniques distinguishes the signal events from the backgrounds, such as continuum events and non-charmed semileptonic decays. The plots and fit results are generated using pyhf, a robust framework for statistical modeling and systematic uncertainty evaluation.The efficiency of identifying these decays is determined using simulated datasets and is given by the ratio of the number of reconstructed events to the number of generated events. Further, the partial branching fractions are determined for different q2 thresholds, providing a refined understanding of semileptonic decay dynamics.