Ablikim M.Achasov M.N.Adlarson P.Albrecht M.Amoroso A.Çetin, Serkant AliKolcu, Onur Buğra2023-02-032023-02-032022Ablikim, M., Achasov, M. N., Adlarson, P., Albrecht, M., Aliberti, R., Amoroso, A., ... & Jiang, X. S. (2022). Study of the Semileptonic Decay Λ c+→ Λ e+ ν e. Physical Review Letters, 129(23), 231803.0031-9007http://dx.doi.org/10.1103/PhysRevLett.129.231803https://hdl.handle.net/20.500.12713/3865The study of the Cabibbo-favored semileptonic decay ?c+??e+?e is reported using a 4.5 fb-1 data sample of e+e- annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be B(?c+??e+?e)=(3.56±0.11stat±0.07syst)%, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in ?c+??e+?e. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a q2-integrated rate predicted by LQCD, we determine |Vcs|=0.936±0.017B±0.024LQCD±0.007??c. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.eninfo:eu-repo/semantics/openAccessGermanium CompoundsQuantum TheoryGermanium AlloysArticle12923WOS:0009210402000112-s2.0-85143661768Q110.1103/PhysRevLett.129.231803Q1