Bounds on the CP Asymmetry in Like-Sign Dileptons from B0B¯0 Meson Decays

Le résumé fourni par la source

We have measured the charge asymmetry in like-sign dilepton yields from ${B}^{0}{\overline{B}}^{0}$ meson decays using the CLEO detector at the Cornell Electron Storage Ring. We find ${a}_{\ensuremath{\ell}\ensuremath{\ell}}^{0}\ensuremath{\equiv}[N({\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{+})\ensuremath{-}N({\ensuremath{\ell}}^{\ensuremath{-}}{\ensuremath{\ell}}^{\ensuremath{-}})]/[N({\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{+})+N({\ensuremath{\ell}}^{\ensuremath{-}}{\ensuremath{\ell}}^{\ensuremath{-}})]\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}+0.013\ifmmode\pm\else\textpm\fi{}0.050\ifmmode\pm\else\textpm\fi{}0.005$. We combine this result with a previous, independent measurement and obtain $\mathrm{Re}({\ensuremath{\epsilon}}_{B})/(1+|{\ensuremath{\epsilon}}_{B}{|}^{2})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}+0.0035\ifmmode\pm\else\textpm\fi{}0.0103\ifmmode\pm\else\textpm\fi{}0.0015$ (uncertainties are statistical and systematic, respectively) for the $\mathrm{CP}$ impurity parameter, ${\ensuremath{\epsilon}}_{B}$.

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