Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 8: Flavour Physics I
T 8.2: Vortrag
Montag, 16. März 2026, 16:30–16:45, KH 01.011
Search for B− → Λc+ p ℓ− νℓ at the Belle II experiment — •Verena Mendel, Torben Ferber, Pablo Goldenzweig, and Raynette Van Tonder — Institute of Experimental Particle Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany
nohyphenationAbout 90% of the inclusive semileptonic B → Xc ℓ ν branching fraction can be accounted for by summing the branching fractions of known exclusive B → D(*)(π) ℓ ν decays. Semileptonic B decays to charmed baryons may account for some of the remaining difference. These decays are poorly understood theoretically and may provide additional insight into the longstanding inclusive/exclusive puzzle in determinations of the CKM matrix element |Vcb|.
In this talk, we present the status of the first search for B− → Λc+ p ℓ− νℓ, which is the lightest final state containing charmed baryons and is expected to be the dominant individual baryonic mode. The analysis is conducted at the Belle II experiment, located at the SuperKEKB asymmetric e+e− collider. We employ a hadronic tagging approach, where the accompanying B meson in e+e− → Υ(4S) → B+ B− events is fully reconstructed via hadronic decay chains. The signal side is reconstructed in the electron and muon modes, with the Λc+ reconstructed in the decay channels Λc+ → p K− π+ and Λc+ → p KS0.
Keywords: Belle II experiment; B physics; Semileptonic decays; Baryons