Ablikim, M.Achasov, M. N.Ahmed, S.Ai, X. C.Albayrak, O.Albrecht, M.Ambrose, D. J.Lou, XinchouBESIII Collaboration2018-06-012018-06-012017-01-272018-06-010370-2693http://hdl.handle.net/10735.1/5811We report the first measurement of the absolute branching fraction for Λ_c⁺ → Λμ⁺ν_μ. This measurement is based on a sample of e⁺e⁻ annihilation data produced at a center-of-mass energy √s̅ = 4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb⁻¹. The branching fraction is determined to be ℬ(Λ_c⁺ → Λμ⁺ν_μ) = (3.49 ± 0.46(stat) ± 0.27(syst))%. In addition, we calculate the ratio ℬ(Λ_c⁺ → Λμ⁺ν_μ) / ℬ(Λ_c⁺ → Λe⁺ν_e) to be 0.96 ± 0.16(stat) ± 0.04(syst).CC BY 4.0 (Attribution)©2017 The Authorshttp://creativecommons.org/licenses/by/4.0/Branching fractions (Nuclear physics)Causality (Physics)BaryonsQuarksElectron-positron interactionsarticleM. Ablikim, M. N. Achasov, S. Ahmed, et al. 2017. "Measurement of the absolute branching fraction for Λ_c⁺ → Λμ⁺ν_μ." Physics Letters B: Nuclear, Elementary Particle and High-Energy Physics 767, doi:10.1016/j.physletb.2017.01.047767