SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 55: Flavor V, Top-BSM
T 55.4: Vortrag
Mittwoch, 22. März 2023, 16:35–16:50, HSZ/0401
Measurement of the branching fractions and differential kinematic distributions of B+/0 → X J/ψ with hadronic tagging — Florian Bernlochner1, Jochen Dingfelder1, Thomas Kuhr2, •Martin Angelsmark1, William Sutcliffe1, and Sviat Bilokin2 for the Belle II collaboration — 1Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn — 2Fakultät für Physik der Ludwig-Maximilians-Universität München
Using data from the Belle II experiment we perform the first measurements of the individual branching fractions B(B0 → X J / ψ) and B(B+ → X J / ψ). The Belle II experiment is located at the superKEKB e+ e− collider in Japan. The collisions are performed at the Υ(4S) resonance leading to a large amount of produced B B pairs. One of the B mesons (tag B meson) is fully reconstructed using the Full Event Interpreter (FEI) algorithm, which then gives full kinematic information about the opposite B (signal candidate). Previous analyses measured the admixture of B0 and B+, but using the B tag we can separate B0 and B+ candidates. A tagged approach also makes it possible to measure the shape distributions of the kinematic variables X mass, J/ ψ momentum and absolute helicity angle. This measurement is also an important background study for a future inclusive B → X ℓ ℓ analysis, where X J/ ψ is one of the major backgrounds. This talk will present the current status of the analysis and predicted systematics with 364 fb−1 integrated luminosity.