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Achasov, M. N.; Ahmed, S.; Amoroso, A.; Bai, J. Z.; Bennett, J. V.; Bertani, M.; Cai, X.; Calcaterra, A.; Chai, J.; Chen, P. L.; Cibinetto, G.; Dai, J. P.; Dedovich, D.; Destefanis, M.; Dong, M. Y.; Dou, Z. L.; Fang, Y.; Felici, G.; Gao, Q.; Garillon, B.; Harris, F. A.; Heng, Y. K.; Holtmann, T.; Hu, T.; Huang, X. Z.; Jin, S.; Johansson, T.; Julin, A.; Khan, T.; Khoukaz, A.; Kiese, P.; Koch, L.; Kuhlmann, M.; Lara, M.; Larin, P.; Li, H. J.; Li, Lei; Li, P. R.; Liang, H.; Liu, B. J.; Liu, D.; Liu, S. B.; Lu, Y. P.; Luo, X. L.; Ma, M. M.; Ma, T.; Ma, X. N.; Ma, X. Y.; Ma, Y. M.; Maggiora, M.; Mao, Y. J.; Meng, Z. X.; Mezzadri, G.; Pan, Y.; Patteri, P.; Pelizaeus, M.; Pettersson, J.; Ping, R. G.; Qiao, C. F.; Qin, Z. H.; Qiu, J. F.; Shan, W.; Sheng, H. Y.; Song, J. J.; Sosio, S.; Sun, L.; Wang, B.; Wang, L. S.; Weber, T.; Wei, D. H.; Weidenkaff, P.; Wiedner, U.; Wolke, M.; Wu, L. H.; Xie, Y. G.; Xu, J. J.; Yan, Y. H.; Ye, M.; You, Z. Y.; Yuncu, A.; Zafar, A. A.; Zhang, B. Y.; Zhang, J. Q.; Zhang, J. W.; Zhang, Yang; Zhang, Yu; Zhang, Z. H.; Zhang, Z. P.; Zhao, J. W.; Zhao, Y. B.; Zheng, J. P.; Zheng, Y. H.; Zhou, L.; Zhou, X.; Zhou, X. R.; Zhu, J.; Zhu, K. J.; Zhu, S.; Zhu, S. H.; Zhu, Y. S.
Physical review letters, 12/2018, Letnik: 121, Številka: 25Journal Article
Using a data sample of ${e}^{+}{e}^{{-}}$ collisions corresponding to an integrated luminosity of $567\text{ }\text{ }{\mathrm{pb}}^{{-}1}$ collected at a center-of-mass energy of $\sqrt{s}=4.6\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic ${\mathrm{{\Lambda}}}_{c}^{+}$ decay with a double-tag method. We obtain $\mathcal{B}({\mathrm{{\Lambda}}}_{c}^{+}{\rightarrow}X{e}^{+}{{\nu}}_{e})=(3.95\pm{}0.34\pm{}0.09)%$, where the first uncertainty is statistical and the second systematic. Using the known ${\mathrm{{\Lambda}}}_{c}^{+}$ lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons (${D}^{0}$ and ${D}^{+}$), we obtain the ratio of the inclusive semileptonic decay widths $\mathrm{{\Gamma}}({\mathrm{{\Lambda}}}_{c}^{+}{\rightarrow}X{e}^{+}{{\nu}}_{e})/\overline{\mathrm{{\Gamma}}}(D{\rightarrow}X{e}^{+}{{\nu}}_{e})=1.26\pm{}0.12$.
