Time-dependent CP Asymmetries in $B^0\to K_S^0{\rho }^0\gamma$ Decays

Abstract

We report the first measurement of CP-violation parameters in B^0 -> K_S^0ρ^0γdecays based on 657 million B\bar B pairs collected with the Belle detector at the KEKB asymmetric-energy collider. We measure the time-dependent CP violating parameter S_{K_S^0ρ^0γ}= 0.11 +/- 0.33(stat.)^{+0.05}_{-0.09}(syst.). We also obtain the effective direct CP violating parameter A_eff=0.05 +/- 0.18(stat.) +/- 0.06(syst.) for m_{K_Sπ^+π^-}<1.8 GeV/c^2 and 0.6 GeV/c^2<m_{π^+π^-}<0.9 GeV/c^2.

6 pages, 3 figures, to be submitted to PRL

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