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APS » Journals » Physical Review Letters » Improved measurement of time-dependent $CP$ violation in $B^{0} \rightarrow J/\psi\pi^{0}$ decays

December 2007, to be published in Physical Review D1

Improved measurement of time-dependent $CP$ violation in $B^{0} \rightarrow J/\psi\pi^{0}$ decays
S. E. Lee \fIet al.\fP

We report improved measurements of time-dependent \emph{CP} violation parameters for $B^0(\overline{B}^0) \to J/\psi\, \pi^0$ decay. This analysis is based on 535 million $B\overline{B}$ pairs accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. From the distribution of proper time intervals between the two $B$ decays, we obtain the following $CP$ violation parameters \begin{center} $\mathcal{S}_{J/\psi\, \pi^0} = -0.65\pm0.21 (\rm{stat})\pm0.05 (\rm{syst})$ and\\ $\mathcal{A}_{J/\psi\, \pi^0} = +0.08\pm0.16 (\rm{stat})\pm0.05 (\rm{syst})$, \end{center} which are consistent with Standard Model expectations.

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