Measurement of the Dynamics of the Decays Ds+ →η (′)e+νe

Belle Collaboration

Результат исследования: Научные публикации в периодических изданияхстатья

6 Цитирования (Scopus)

Аннотация

Using e+e- annihilation data corresponding to an integrated luminosity of 3.19 fb-1 collected at a center-of-mass energy of 4.178 GeV with the BESIII detector, we measure the absolute branching fractions BDs+→ηe+νe=(2.323±0.063stat±0.063syst)% and BDs+→η′e+νe=(0.824±0.073stat±0.027syst)% via a tagged analysis technique, where one Ds is fully reconstructed in a hadronic mode. Combining these measurements with previous BESIII measurements of BD+→η(′)e+νe, the η-η′ mixing angle in the quark flavor basis is determined to be φP=(40.1±2.1stat±0.7syst)°. From the first measurements of the dynamics of Ds+→η(′)e+νe decays, the products of the hadronic form factors f+η(′)(0) and the Cabibbo-Kobayashi-Maskawa matrix element |Vcs| are determined with different form factor parametrizations. For the two-parameter series expansion, the results are f+η(0)|Vcs|=0.4455±0.0053stat±0.0044syst and f+η′(0)|Vcs|=0.477±0.049stat±0.011syst.

Язык оригиналаанглийский
Номер статьи121801
Число страниц9
ЖурналPhysical Review Letters
Том122
Номер выпуска12
DOI
СостояниеОпубликовано - 25 мар 2019

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