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Статья

Ablikim, M.
Study of *L*+&sub(c)*>*L*m*+*n&sub(*m) and Test of Lepton Flavor Universality with *L*+&sub(c)*>*Ll*+*n&sub(l) Decays / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, A.Sarantsev, A.Zhemchugov, [a.o.] // Physical Review D [Electronic resource]. – 2023. – Vol.108, No.3. – P.L031105. – URL: https://doi.org/10.1103/PhysRevD.108.L031105. – Bibliogr.:61.

The study of the Cabibbo-favored semileptonic decay Λ+c→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(Λ+c→Λμ+νμ)=(3.48±0.14stat±0.10syst)%, 3 times more precise than the prior world average result. Tests of lepton flavor universality using Λ+c→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 Λ+c→Λℓ+νℓ decays, which provide stringent tests and calibration for lattice quantum chromodynamics calculations.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки