Using 4.5 fb−1 of e+e− annihilation data samples collected at center-of-mass energies ranging from 4.600 to 4.698 GeV with the BESIII detector at the BEPCII collider, we measured the absolute branching fraction for the inclusive semileptonic decay Λ+c → Xe+νe, where X refers to any possible particle system. The branching fraction of the decay is determined to be B(Λ+c → Xe+νe) = (4.06 pm 0.10stat pm 0.09syst)%. Our result improves the precision of previous measurements of B(Λ+c → Xe+νe) by more than threefold. Using the known Λ+c lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons, we measure the ratio of inclusive semileptonic decay widths Γ(Λ+c → Xe+νe)=Γ ̄(D → Xe+νe) = 1.28 pm 0.05, where statistical and systematic uncertainties are combined.
Improved measurement of the absolute branching fraction of inclusive semileptonic Λc+ decay
Garzia, I.;Scodeggio, M.;
2023
Abstract
Using 4.5 fb−1 of e+e− annihilation data samples collected at center-of-mass energies ranging from 4.600 to 4.698 GeV with the BESIII detector at the BEPCII collider, we measured the absolute branching fraction for the inclusive semileptonic decay Λ+c → Xe+νe, where X refers to any possible particle system. The branching fraction of the decay is determined to be B(Λ+c → Xe+νe) = (4.06 pm 0.10stat pm 0.09syst)%. Our result improves the precision of previous measurements of B(Λ+c → Xe+νe) by more than threefold. Using the known Λ+c lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons, we measure the ratio of inclusive semileptonic decay widths Γ(Λ+c → Xe+νe)=Γ ̄(D → Xe+νe) = 1.28 pm 0.05, where statistical and systematic uncertainties are combined.File | Dimensione | Formato | |
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PhysRevD.107.052005.pdf
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