Measurement of the absolute branching fraction of the inclusive decay ${\bar{\Lambda }}_c^{-}\to \bar{n}+X$

Abstract

Based on $e^{+}{e}^{-}$ collision data corresponding to an integrated luminosity of 4.5 $f{b}^{-1}$ collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay ${\Lambda }_c^{+}\to n+X$, where $X$ refers to any possible final state particles, is measured. The absolute branching fraction is determined to be $\mathcal{B}({\Lambda }_c^{+}\to n+X)=(32.4\pm 0.7\pm 1.5)\%$, where the first uncertainty is statistical and the second systematic. Assuming $CP$ symmetry, the measurement indicates that about one-fourth of ${\Lambda }_c^{+}$ (${\bar{\Lambda }}_c^{-}$) decay modes with a neutron (an anti-neutron) in the final state have not been observed.

8 pages, 2 figures

References in corpus (6)

• Number of $J/\psi$ events at BESIII
• Luminosities and energies of $e^{+}{e}^{-}$ collision data taken between $\sqrt{s}$=4.612 GeV and 4.946 GeV at BESIII
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to n{\pi }^{+}$
• Observations of the Cabibbo-Suppressed decays ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$, $n{\pi }^{+}{\pi }^{-}{\pi }^{+}$ and the Cabibbo-Favored decay ${\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+}$
• Development of a Data-Driven Method to Simulate the Detector Response of Anti-neutron at BESIII

Cited by in corpus (4)

• ${\Lambda }_c$ semileptonic decays
• Topological amplitudes of charmed baryon decays in the $SU(3{)}_F$ limit
• First observation of the decay ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}{\pi }^0$
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to {\Sigma }^{-}{K}^{+}{\pi }^{+}$