Measurement of the Absolute Branching Fraction of the Inclusive Semileptonic Λc+ Decay

The BELLE collaboration

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5 Citations (Scopus)

Abstract

Using a data sample of e+e- collisions corresponding to an integrated luminosity of 567 pb-1 collected at a center-of-mass energy of s=4.6 GeV with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic Λc+ decay with a double-tag method. We obtain B(Λc+→Xe+νe)=(3.95±0.34±0.09)%, where the first uncertainty is statistical and the second systematic. Using the known Λc+ lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons (D0 and D+), we obtain the ratio of the inclusive semileptonic decay widths Γ(Λc+→Xe+νe)/Γ(D→Xe+νe)=1.26±0.12.

Original languageEnglish
Article number251801
Pages (from-to)251801
Number of pages8
JournalPhysical Review Letters
Volume121
Issue number25
DOIs
Publication statusPublished - 18 Dec 2018

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