Measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$

Abstract

We report the first absolute measurement of the branching fraction of ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$. This measurement is based on 567 pb${}^{-1}$ of $e^{+}{e}^{-}$ annihilation data produced at $\sqrt{s}=4.599$ GeV, which is just above the ${\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be $\mathcal{B}({\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e)=(3.63\pm 0.38(\mathrm{stat})\pm 0.20(\mathrm{syst}))\%$, representing a more than twofold improvement in precision upon previously published results. As the branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$ is the benchmark for those of other ${\Lambda }_c^{+}$ semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

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