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We report the first measurement of CP-violation parameters in $B^0\to\rho^0\gamma$ decays based on a data sample of $657\times 10^6 B\bar{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
- The flavor of the $B$ meson is identified from the decay products of the accompanying $B$ meson.
- We obtain the time-dependent and direct CP-violating parameters, $\cals_{\rhoz\gamma} = -0.83\pm 0.65(stat)\pm 0.18(syst)$ and $\cala_{\rhoz\gamma} = -0.44\pm 0.49(stat)\pm 0.14(syst)$, respectively.
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