Improved measurement of absolute hadronic branching fractions of the Ds+ meson

Le résumé fourni par la source

The branching fractions of ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}$ meson decays serve to normalize many measurements of processes involving charm quarks. Using $586\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for 13 ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}$ decays in 16 reconstructed final states with a double tag technique. In particular we make a precise measurement of the branching fraction $\mathcal{B}({D}_{s}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{+})=(5.55\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.13)%$, where the uncertainties are statistical and systematic, respectively. We find a significantly reduced value of $\mathcal{B}({D}_{s}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}^{\ensuremath{'}})$ compared to the world average, and our results bring the inclusively and exclusively measured values of $\mathcal{B}({D}_{s}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}X)$ into agreement. We also search for $CP$-violating asymmetries in ${D}_{s}$ decays and measure the cross section of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{*}{D}_{s}$ at ${E}_{\mathrm{cm}}=4.17\text{ }\text{ }\mathrm{GeV}$.

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