Электронный каталог

Статья

Ablikim, M.
Measurement of the Branching Fraction of D*+&sub(s)*>*t*+*n&sub(*t) via *t*+*>*m*+*n&sub(*m)*n^-&sub(*t) / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, S.Pogodin, A.Sarantsev, A.Zhemchugov, [a.o.] // Journal of High Energy Physics [Electronic resource]. – 2023. – Vol.2023, No.9. – P.124. – URL: https://doi.org/10.1007/JHEP09(2023)124. – Bibliogr.:59.

Utilizing 7.33 fb−1 of e+e− collision data taken at the center-of-mass energies of 4.128, 4.157, 4.178, 4.189, 4.199, 4.209, 4.219, and 4.226 GeV with the BESIII detector, the branching fraction of the leptonic decay → τ+ντ via τ+ → μ+νμτ is measured to be = (5.37 ± 0.17stat ± 0.15syst)%. Combining this branching fraction with the world averages of the measurements of the masses of τ+ and as well as the lifetime of , we extract the product of the decay constant of and the c → s Cabibbo-Kobayashi-Maskawa matrix element to be |Vcs| = (246.7 ± 3.9stat ± 3.6syst) MeV. Taking |Vcs| from a global fit in the standard model we obtain = (253.4 ± 4.0stat ± 3.7syst) MeV. Conversely, taking from lattice quantum chromodynamics calculations, we obtain |Vcs| = 0.987 ± 0.016stat ± 0.014syst.



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