Type: Article
Publication Date: 2012-04-24
Citations: 37
DOI: https://doi.org/10.1103/physrevd.85.071105
We report a new sensitive search for $CPT$ violation, which includes improved measurements of the $CPT$-violating parameter $z$ and the total decay-width difference normalized to the averaged width $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{d}/{\ensuremath{\Gamma}}_{d}$ of the two ${B}_{d}$ mass eigenstates. The results are based on a data sample of $535\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We obtain $\mathcal{R}e(z)=[+1.9\ifmmode\pm\else\textpm\fi{}3.7(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}3.3(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, $\mathcal{I}m(z)=[\ensuremath{-}5.7\ifmmode\pm\else\textpm\fi{}3.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}3.3(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, and $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{d}/{\ensuremath{\Gamma}}_{d}=[\ensuremath{-}1.7\ifmmode\pm\else\textpm\fi{}1.8(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.1(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, all of which are consistent with zero. This is the most precise single measurement of these parameters in the neutral $B$-meson system to date.