Improved measurement of the absolute branching fraction of inclusive semileptonic ${\Lambda }_c^{+}$ decay

Abstract

Using $4.5{\mathrm{fb}}^{-1}$ 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 ${\Lambda }_c^{+}\to X{e}^{+}{\nu }_e$, where $X$ refers to any possible particle system. The branching fraction of the decay is determined to be $\mathcal{B}({\Lambda }_c^{+}\to X{e}^{+}{\nu }_e)=(4.06\pm 0.10_{stat.}\pm 0.09_{syst.})\%$. Our result improves the precision of previous measurement of $\mathcal{B}({\Lambda }_c^{+}\to X{e}^{+}{\nu }_e)$ by more than threefold. Using the known ${\Lambda }_c^{+}$ lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons, we measure the ratio of inclusive semileptonic decay widths $\Gamma ({\Lambda }_c^{+}\to X{e}^{+}{\nu }_e)/\bar{\Gamma }(D\to X{e}^{+}{\nu }_e)=1.28\pm 0.05$, where statistical and systematic uncertainties are combined.

11 pages, 6 figures

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Cited by in corpus (1)

• Evidence for the semileptonic decays ${\Lambda }_c^{+}\to {\Sigma }^{\pm }{\pi }^{\mp }{e}^{+}{\nu }_e$