Limits on the decay-rate difference of neutralBmesons and onCP,T, andCPTviolation inB0B0oscillations

Citations Over TimeTop 13% of 2004 papers

Abstract

Using events in which one of two neutral B mesons from the decay of an $\ensuremath{\Upsilon}(4S)$ resonance is fully reconstructed, we set limits on the difference between the decay rates of the two neutral B mass eigenstates and on CP, T, and CPT violation in ${B}^{0}{B}^{0}$ mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations $(\ensuremath{\Delta}m,\ensuremath{\Delta}\ensuremath{\Gamma}/\ensuremath{\Gamma}),$ CPT and CP violation $(\mathrm{Re}\mathsf{z},\mathrm{Im}\mathsf{z}),$ and CP and T violation $(\mathrm{Im}{\ensuremath{\lambda}}_{\mathrm{CP}},|q/p|),$ where ${\ensuremath{\lambda}}_{\mathrm{CP}}$ characterizes ${B}^{0}$ and ${B}^{0}$ decays to states of charmonium plus ${K}_{S}^{0}$ or ${K}_{L}^{0}.$ The results are $\mathrm{sgn}(\mathrm{Re}{\ensuremath{\lambda}}_{\mathrm{CP}})\ensuremath{\Delta}\ensuremath{\Gamma}/\ensuremath{\Gamma}=\ensuremath{-}0.008\ifmmode\pm\else\textpm\fi{}0.037(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.018(\mathrm{syst}.)[\ensuremath{-}0.084,0.068],$$|q/p|=1.029\ifmmode\pm\else\textpm\fi{}0.013(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.011(\mathrm{syst}.)[1.001,1.057],$$(\mathrm{Re}{\ensuremath{\lambda}}_{\mathrm{CP}}/|{\ensuremath{\lambda}}_{\mathrm{CP}}|)\mathrm{Re}\mathrm{z}=0.014\ifmmode\pm\else\textpm\fi{}0.035(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.034(\mathrm{syst}.)[\ensuremath{-}0.072,0.101],$$\mathrm{Im}\mathrm{z}=0.038\ifmmode\pm\else\textpm\fi{}0.029(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.025(\mathrm{syst}.)[\ensuremath{-}0.028,0.104].$The values inside square brackets indicate the 90% confidence-level intervals. The values of $\mathrm{Im}{\ensuremath{\lambda}}_{\mathrm{CP}}$ and $\ensuremath{\Delta}m$ are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.

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