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Chen, I. Boyko, I. Denysenko, J. C. Chen, J. Dong, J. Fang, J. F. Chang, J. M. Bian, J. P. Dai, J. V. Bennett, J. Z. Bai, J. Z. Fan, L. Fava, L. Y. Dong, M. Albrecht, M. Bertani, M. Destefanis, M. L. Chen, M. N. Achasov, M. Y. Dong, O. Albayrak, O. Cakir, P. F. Duan, Q. An, R. A. Briere, R. Baldini Ferroli, S. A. Cetin, S. J. Chen, S. S. Fang, S. X. Du, X. Cai, X. C. Ai, X. Chen, X. Fang, X. K. Chu, X. R. Chen, Y. Ban, Y. B. Chen, Y. Ding, Y. Fang, Z. Y. Deng","submitted_at":"2015-10-09T10:02:46Z","abstract_excerpt":"We report the first absolute measurement of the branching fraction of $\\Lambda^+_{c}\\rightarrow \\Lambda e^+\\nu_e$. This measurement is based on 567 pb$^{-1}$ of $e^+e^-$ annihilation data produced at $\\sqrt{s}=4.599$ GeV, which is just above the $\\Lambda^+_c\\bar{\\Lambda}^-_c$ threshold. The data were collected with the BESIII detector at the BEPCII storage rings. 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