Improved measurement of time-dependent $C P$ violation in $B^{0} \to J / ψ π^{0}$ decays

We report improved measurements of time-dependent

C P

violation parameters for

B^{0} ({\bar{B}}^{0}) \to J / ψ π^{0}

decay. This analysis is based on

535 \times 10^{6}

B \bar{B}

pairs accumulated at the

Υ (4 S)

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

C P

violation parameters

S_{J / ψ π^{0}} = - 0.65 \pm 0.21 (stat) \pm 0.05 (syst) and A_{J / ψ π^{0}} = + 0.08 \pm 0.16 (stat) \pm 0.05 (syst),

which are consistent with standard model expectations.

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Improved measurement of time-dependentCPviolation inB0→J/ψπ0decays