Measurement of the Absolute Branching Fraction for ${\Lambda }_c^{+}\to \Lambda {\mu }^{+}{\nu }_{\mu }$

Abstract

We report the first measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda {\mu }^{+}{\nu }_{\mu }$. This measurement is based on a sample of $e^{+}{e}^{-}$ annihilation data at a center-of-mass energy of $\sqrt{s}=4.6$ GeV collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb${}^{-1}$. The branching fraction is determined to be $\mathcal{B}({\Lambda }_c^{+}\to \Lambda {\mu }^{+}{\nu }_{\mu })=(3.49\pm 0.46(\mathrm{stat})\pm 0.27(\mathrm{syst}))\%$. In addition, we calculate the ratio $\mathcal{B}({\Lambda }_c^{+}\to \Lambda {\mu }^{+}{\nu }_{\mu })/\mathcal{B}({\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e)$ to be $0.96\pm 0.16(\mathrm{stat})\pm 0.04(\mathrm{syst})$.

arXiv comment7 pages, 2 figures

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