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نویسندگان

چکیده

Using 4.5 fb−1 of e+e− annihilation data samples collected at the center-of-mass energies ranging from 4.600 GeV to 4.699 with BESIII detector BEPCII collider, a first study semileptonic decays Λc+→pK−e+νe, Λc+→Λ(1520)e+νe and Λc+→Λ(1405)e+νe is performed. The Λc+→pK−e+νe decay observed significance 8.2σ branching fraction measured be B(Λc+→pK−e+νe)=(0.88±0.17stat±0.07syst)×10−3. We also report evidence significances 3.3σ 3.2σ, respectively, measure B(Λc+→Λ(1520)e+νe)=(1.02±0.52stat±0.11syst)×10−3 B(Λc+→Λ(1405)[→pK−]e+νe)=(0.42±0.19stat±0.04syst)×10−3. Combining these inclusive Λc+ by BESIII, relative determined [B(Λc+→pK−e+νe)/B(Λc+→Xe+νe)]=(2.1±0.4stat±0.2syst)%, which provides clear confirmation that are not saturated Λℓ+νℓ final state.Received 23 July 2022Accepted 29 November 2022DOI:https://doi.org/10.1103/PhysRevD.106.112010Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article’s title, journal citation, DOI. Funded SCOAP3.Published SocietyPhysics Subject Headings (PhySH)Research AreasLeptonic, & radiative decaysPhysical SystemsCharm quarkCharmed baryonsParticles Fields

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