In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 9 ( 2023-09-19)
Kurzfassung:
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 $$ {D}_s^{+} $$ D s + → τ + ν τ via τ + → μ + ν μ $$ \overline{\nu} $$ ν ¯ τ is measured to be $$ {\mathcal{B}}_{D_s^{+}\to {\tau}^{+}{\nu}_{\tau }} $$ B D s + → τ + ν τ = (5 . 37 ± 0 . 17 stat ± 0 . 15 syst )%. Combining this branching fraction with the world averages of the measurements of the masses of τ + and $$ {D}_s^{+} $$ D s + as well as the lifetime of $$ {D}_s^{+} $$ D s + , we extract the product of the decay constant of $$ {D}_s^{+} $$ D s + and the c → s Cabibbo-Kobayashi-Maskawa matrix element to be $$ {f}_{D_s^{+}} $$ f D s + |V cs | = (246 . 7 ± 3 . 9 stat ± 3 . 6 syst ) MeV. Taking |V cs | from a global fit in the standard model we obtain $$ {f}_{D_s^{+}} $$ f D s + = (253 . 4 ± 4 . 0 stat ± 3 . 7 syst ) MeV. Conversely, taking $$ {f}_{D_s^{+}} $$ f D s + from lattice quantum chromodynamics calculations, we obtain |V cs | = 0 . 987 ± 0 . 016 stat ± 0 . 014 syst .
Materialart:
Online-Ressource
ISSN:
1029-8479
DOI:
10.1007/JHEP09(2023)124
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2023
ZDB Id:
2027350-2
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