Measurements of the absolute branching fractions and CP asymmetries for D+→KS,L0K+(π0)

Le résumé fourni par la source

Using ${e}^{+}{e}^{\ensuremath{-}}$ collision data corresponding to an integrated luminosity of $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ taken at a center-of-mass energy of 3.773 GeV with the BESIII detector, we determine the absolute branching fractions $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+})=(3.02\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.08)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+}{\ensuremath{\pi}}^{0})=(5.07\ifmmode\pm\else\textpm\fi{}0.19\ifmmode\pm\else\textpm\fi{}0.23)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}_{L}^{0}{K}^{+})=(3.21\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.11)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, and $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}_{L}^{0}{K}^{+}{\ensuremath{\pi}}^{0})=(5.24\ifmmode\pm\else\textpm\fi{}0.22\ifmmode\pm\else\textpm\fi{}0.22)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+})$ is consistent with the world average value and the other three branching fractions are measured for the first time. We also measure the $CP$ asymmetries for the four decays and do not find a significant deviation from zero.

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