Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 78: Electroweak Interactions II
T 78.7: Talk
Thursday, March 18, 2021, 17:30–17:45, Tc
Measurement of the Branching Fractions and Differential Kinematic Distributions of B+/0 → X J/ψ with Hadronic Tagging — Florian Bernlochner1, William Sutcliffe1, Sviat Bilokin2, Thomas Khur2, and •Martin Angelsmark1 for the Belle II collaboration — 1Physikalisches Institut der Rheinischen, Friedrich-Wilhelms-Universität Bonn, 53115 Bonn, Germany — 2Fakultät für Physik, Ludwig Maximilians University Munich, D-80539 München, Germany
We measure for the first time the individual branching fractions of B+ → X J/ψ and B0 → X J/ψ to be X and Y, respectively, using hadronic tagging in 74 fb−1 of Belle II data. In addition, the employment of hadronic tagging allows for a novel determination of the differential distributions of the mass of the X system, the helicity angle for the decay and the momentum magnitudes of the J/ψ and X in the B rest frame. These fully inclusive measurements of B → X J/ψ represent an important benchmark towards a fully inclusive analysis of B → Xs ℓ ℓ with tag-side reconstruction.