Measurement of the absolute branching fraction of the inclusive decay ${\Lambda }_c^{+}\to K_S^{0}X$

Abstract

We report the first measurement of the absolute branching fraction of the inclusive decay ${\Lambda }_c^{+}\to K_S^{0}X$. The analysis is performed using an $e^{+}{e}^{-}$ collision data sample corresponding to an integrated luminosity of 567 pb${}^{-1}$ taken at $\sqrt{s}$ = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored ${\bar{\Lambda }}_c^{-}$ decay modes and the double-tag technique, this absolute branching fraction is measured to be $\mathcal{B}({\Lambda }_c^{+}\to K_S^{0}X)=(9.9\pm 0.6\pm 0.4)\%$, where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is $(18.7\pm 8.3)\%$, which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.

arXiv commentPublished in EPJC

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Cited by in corpus (3)

• Anatomy of ${\Lambda }_c^{+}$ semileptonic decays
• Topological amplitudes of charmed baryon decays in the $SU(3{)}_F$ limit
• Measurement of the branching fractions of the decays ${\Lambda }_c^{+}\to \Lambda K_S^0{K}^{+}$, ${\Lambda }_c^{+}\to \Lambda K_S^0{\pi }^{+}$ and ${\Lambda }_c^{+}\to \Lambda K^{\ast +}$