Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 27: Invited Topical Talks 2
T 27.2: Eingeladener Vortrag
Dienstag, 5. März 2024, 14:30–15:00, Geb. 30.22: Gaede-HS
Fully-inclusive measurement of B0,±→ X J/ψ processes at Belle II — •Sviatoslav Bilokin — Ludwig Maximilian University, Munich, Germany
Studies of b→ ccs processes, such as B0,± → K0,± J/ψ, were at the core of the physics programs of the first generation of B-factories and served as the basis for the Nobel Prize in Physics 2008. Despite numerous measurements in the last few decades, many physics observables of these processes remain unknown, especially for the higher-order resonances in the final state. Modern high-luminosity frontier experiments, such as Belle II at SuperKEKB, provide an ideal environment for advancing precision studies of b→ ccs decays with inclusive final state.
In this contribution, we report the first measurements of the individual branching ratios BR(B0 → X J / ψ) and BR(B+ → X J / ψ) using a fully-inclusive approach at Belle II, where X represents strange-quark or light-quark hadrons. Additionally, the employment of hadronic tagging allows for a novel determination of the differential distributions of the helicity angle for the decay and the momentum magnitudes of the J / ψ in the B rest frame. These fully-inclusive measurements of B → X J / ψ decays represent an important milestone towards a fully-inclusive analysis of B → X ℓ+ ℓ− processes in the near future, which will serve as an excellent probe for New Physics searches.
Keywords: Belle II; Fully-inclusive measurements; B to X J/ψ; B-physics