Measurements of the branching fractions for the semileptonic decays Ds+→ϕe+νe , ϕμ+νμ , ημ+νμ and η′μ+νμ

Le résumé fourni par la source

By analyzing $482\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data collected at the center-of-mass energy $\sqrt{s}=4.009\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector, we measure the branching fractions for the semi-leptonic decays ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{e}^{+}{\ensuremath{\nu}}_{e}$, $\ensuremath{\phi}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$, $\ensuremath{\eta}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ to be $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{e}^{+}{\ensuremath{\nu}}_{e})=(2.26\ifmmode\pm\else\textpm\fi{}0.45\ifmmode\pm\else\textpm\fi{}0.09)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}})=\phantom{\rule{0ex}{0ex}}(1.94\ifmmode\pm\else\textpm\fi{}0.53\ifmmode\pm\else\textpm\fi{}0.09)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}})=(2.42\ifmmode\pm\else\textpm\fi{}0.46\ifmmode\pm\else\textpm\fi{}0.11)%$ and $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}})=(1.06\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}0.54\ifmmode\pm\else\textpm\fi{}0.07)%$, where the first and second uncertainties are statistical and systematic, respectively. The branching fractions for the three semi-muonic decays ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}},\ensuremath{\eta}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ are determined for the first time and that of ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{e}^{+}{\ensuremath{\nu}}_{e}$ is consistent with the world average value within uncertainties.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.