TY - JOUR
T1 - Study of Λc+ → Λμ+νμ and test of lepton flavor universality with Λc+ → Λℓ+νℓ decays
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Ai, X. C.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© 2023 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.
PY - 2023/8/1
Y1 - 2023/8/1
N2 - The study of the Cabibbo-favored semileptonic decay Λc+→Λμ+νμ is reported using 4.5 fb-1 of e+e- annihilation data collected at center-of-mass energies ranging from 4.600 to 4.699 GeV. The branching fraction of the decay is measured to be B(Λc+→Λμ+νμ)=(3.48±0.14stat±0.10syst)%, 3 times more precise than the prior world average result. Tests of lepton flavor universality using Λc+→Λℓ+νℓ (ℓ=e, μ) decays are reported for the first time, based on measurements of the differential decay rates and the forward-backward asymmetries in separate four-momentum transfer regions. The results are compatible with Standard Model predictions. Furthermore, we improve the determination of the form-factor parameters in Λc+→Λℓ+νℓ decays, which provide stringent tests and calibration for lattice quantum chromodynamics calculations.
AB - The study of the Cabibbo-favored semileptonic decay Λc+→Λμ+νμ is reported using 4.5 fb-1 of e+e- annihilation data collected at center-of-mass energies ranging from 4.600 to 4.699 GeV. The branching fraction of the decay is measured to be B(Λc+→Λμ+νμ)=(3.48±0.14stat±0.10syst)%, 3 times more precise than the prior world average result. Tests of lepton flavor universality using Λc+→Λℓ+νℓ (ℓ=e, μ) decays are reported for the first time, based on measurements of the differential decay rates and the forward-backward asymmetries in separate four-momentum transfer regions. The results are compatible with Standard Model predictions. Furthermore, we improve the determination of the form-factor parameters in Λc+→Λℓ+νℓ decays, which provide stringent tests and calibration for lattice quantum chromodynamics calculations.
UR - https://www.scopus.com/pages/publications/85169316213
U2 - 10.1103/PhysRevD.108.L031105
DO - 10.1103/PhysRevD.108.L031105
M3 - Article
AN - SCOPUS:85169316213
SN - 2470-0010
VL - 108
JO - Physical Review D
JF - Physical Review D
IS - 3
M1 - L031105
ER -