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T: Fachverband Teilchenphysik

T 8: Flavour Physics I

T 8.6: Talk

Monday, March 16, 2026, 17:30–17:45, KH 01.011

Search for B → Λ_c p ℓ ν decays at Belle II — •Tim Müller, Markus Prim, Valerio Bertacchi, and Florian Bernlochner — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

The branching fraction of the inclusive semileptonic decays B → X_c ℓ ν is around 10 % and is experimentally and theoretically well understood. On the other hand, the exclusive semileptonic decays of the B-meson add up to only 9 % of the branching ratio. This gap might originate from baryonic semileptonic decays such as B → Λ_c p ℓ ν, which have not been directly measured yet. We aim to solve this gap by further investigating this decay and determining its absolute branching ratio.

To achieve this, a tag-side full-event interpretation is performed by reconstructing the tag B meson in both hadronic and semileptonic decay channels to maximize the available statistics. The SysVar framework is then being used to evaluate systematic uncertainties for template fitting via pyhf. In this talk we present the motivation, analysis strategy and preliminary results of this ongoing analysis.

Keywords: B-meson decays; Semileptonic decays; Baryonic final states; Branching fraction