Search for CP violation in the decays D±→KS0K± , Ds±→KS0K± , and Ds±→KS0π±

Le résumé fourni par la source

We report a search for $CP$ violation in the decay modes ${D}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}$, ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}$, and ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ using a data set corresponding to an integrated luminosity of $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the BABAR detector at the PEP-II asymmetric energy ${e}^{+}{e}^{\ensuremath{-}}$ storage rings. The decay rate $CP$ asymmetries, ${A}_{CP}$, are determined to be $(+0.13\ifmmode\pm\else\textpm\fi{}0.36(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.25(\mathrm{syst}))%$, $(\ensuremath{-}0.05\ifmmode\pm\else\textpm\fi{}0.23(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.24(\mathrm{syst}))%$, and $(+0.6\ifmmode\pm\else\textpm\fi{}2.0(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{syst}))%$, respectively. These measurements are consistent with zero, and also with the Standard Model prediction [$(\ensuremath{-}0.332\ifmmode\pm\else\textpm\fi{}0.006)%$ for the ${D}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}$ and ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}$ modes, and $(+0.332\ifmmode\pm\else\textpm\fi{}0.006)%$ for the ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ mode]. They are the most precise determinations to date.

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