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Anita; Bai, Y; Berger, N; Bettoni, D; Cetin, S A; Chang, J F; Chang, W L; Chen, M L; Chen, X R; Dai, H L; Denig, A; De, Mori F; Dong, M Y; Fang, S S; Fu Y; Garzia, I; Gong, W X; Gu, L M; Guo, R P; Guo, Y P; He, K L; Huang, Z; Kappert, R; Keshk, I K; Kuessner, M; Kühn, W; Lange, J S; Lavezzi, L; Li, Lei; Li, X H; Li, Z B; Liao, L Z; Liu, D Y; Liu, F H; Liu, H B; Liu, J B; Liu, X; Luo, X L; Lusso, S; Lyu, X R; Maldaner, S; Malde, S; Mangoni, A; Marcello, S; Mezzadri, G; Mitchell, R E; Pan, Y; Pelizaeus, M; Ping, R G; Prasad, V; Qi, T Y; Qin, L Q; Qin, X S; Qiu, J F; Qu, S Q; Ravindran, K; Rodin, V; Rosner Ch; Shao, M; Shen, P X; Shi, X; Song, Q Q; Song, W M; Sui, F F; Sun, Y Z; Sun, Z T; Tang, C J; Uman, I; Wang, Y; Wang, Z Y; Wang, Ziyi; Weber, T; Wei, D H; Weidner, F; Wilkinson, G; Wolke, M; Wu, L H; Wu, L J; Xiao, H; Yan, W B; Yang, H X; Yang, Y X; Yin, J H; You, Z Y; Yu, J S; Yu T; Yuan, Y; Yuncu, A; Zeng, Y; Zhang, Guangyi; Zhang, J W; Zhang, T J; Zhang, Y H; Zhang, Yan; Zhao, J; Zhao, S J; Zhao, Y B; Zhemchugov, A; Zhou, Q; Zhu, S H
The European physical journal. C, Particles and fields, 10/2020, Volume: 80, Issue: 10Journal Article
We report the first measurement of the absolute branching fraction of the inclusive decay Λc+→KS0X. The analysis is performed using an e+e- collision data sample corresponding to an integrated luminosity of 567 pb-1 taken at s = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored Λ¯c- decay modes and the double-tag technique, this absolute branching fraction is measured to be 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)%, which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.
