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Title: Measurement of the Absolute Branching Fraction of the Inclusive Semileptonic Λ c + Decay

Journal Article · · Physical Review Letters
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Using a data sample of $${e}^{+}{e}^{{-}}$$ collisions corresponding to an integrated luminosity of $$567\text{ }\text{ }{\mathrm{pb}}^{{-}1}$$ collected at a center-of-mass energy of $$\sqrt{s}=4.6\text{ }\text{ }\mathrm{GeV}$$ with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic $${\mathrm{{\Lambda}}}_{c}^{+}$$ decay with a double-tag method. We obtain $$\mathcal{B}({\mathrm{{\Lambda}}}_{c}^{+}{\rightarrow}X{e}^{+}{{\nu}}_{e})=(3.95\pm{}0.34\pm{}0.09)%$$, where the first uncertainty is statistical and the second systematic. Using the known $${\mathrm{{\Lambda}}}_{c}^{+}$$ lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons ($${D}^{0}$$ and $${D}^{+}$$), we obtain the ratio of the inclusive semileptonic decay widths $$\mathrm{{\Gamma}}({\mathrm{{\Lambda}}}_{c}^{+}{\rightarrow}X{e}^{+}{{\nu}}_{e})/\overline{\mathrm{{\Gamma}}}(D{\rightarrow}X{e}^{+}{{\nu}}_{e})=1.26\pm{}0.12$$.

Research Organization:
Indiana Univ., Bloomington, IN (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Hawaii, Honolulu, HI (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE
Contributing Organization:
BESIII Collaboration
Grant/Contract Number:
FG02-05ER41374; SC0010118; SC0010504; SC0012069
OSTI ID:
1487302
Alternate ID(s):
OSTI ID: 1504141
Journal Information:
Physical Review Letters, Vol. 121, Issue 25; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (8)