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SpringerOpen, The European Physical Journal C, 10(80), 2020

DOI: 10.1140/epjc/s10052-020-08447-0

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Measurement of the absolute branching fraction of the inclusive decay $Λ _c^+ → K_S^0X$

Journal article published in 2020 by M. Ablikim, M. N. Achasov, P. Adlarson, S. Ahmed, M. Albrecht, A. Amoroso, Q. An, Anita, Y. Bai, O. Bakina, R. Baldini Ferroli, I. Balossino, Y. Ban, K. Begzsuren, J. V. Bennett and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractWe report the first measurement of the absolute branching fraction of the inclusive decay$Λ _c^+ → K_S^0X$Λc+→KS0X. The analysis is performed using an$e^+e^-$e+e-collision data sample corresponding to an integrated luminosity of 567 $\hbox {pb}^{-1}$pb-1taken at$\sqrt{s}$s= 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored${\bar{\Lambda }}_c^-$Λ¯c-decay modes and the double-tag technique, this absolute branching fraction is measured to be${\mathcal {B}}(Λ _c^+ → K_S^0X)=(9.9± 0.6± 0.4)\%$B(Λc+→KS0X)=(9.9±0.6±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$(18.7± 8.3)\%$(18.7±8.3)%, which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.