Studies ofB0−B0mixing properties with inclusive dilepton events

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Abstract

We report a precise determination of the ${B}^{0}\ensuremath{-}{B}^{0}$ mixing parameter $\ensuremath{\Delta}{m}_{d}$ based on the time evolution of same-sign and opposite-sign dilepton yields in $\ensuremath{\Upsilon}(4S)$ decays. Data were collected with the Belle detector at KEKB. Using data samples of 29.4 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ recorded at the $\ensuremath{\Upsilon}(4S)$ resonance and 3.0 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ recorded at an energy 60 MeV below the resonance, we measure $\ensuremath{\Delta}{m}_{d}=[0.503\ifmmode\pm\else\textpm\fi{}0.008(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.010(\mathrm{syst})]{\mathrm{ps}}^{\ensuremath{-}1}.$ From the same analysis, we also measure the ratio of charged and neutral B meson production at the $\ensuremath{\Upsilon}(4S),$ ${f}_{+}{/f}_{0}=1.01\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.09(\mathrm{syst}),$ and CPT violation parameters in ${B}^{0}\ensuremath{-}{B}^{0}$ mixing, $\mathfrak{R}(\mathrm{cos}\ensuremath{\theta})=0.00\ifmmode\pm\else\textpm\fi{}0.12(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.01(\mathrm{syst})$ and $\mathfrak{I}(\mathrm{cos}\ensuremath{\theta})=0.03\ifmmode\pm\else\textpm\fi{}0.01(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{syst}).$

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