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We report results on studies of CP violation in the three-body charmless decay B ± ! K ± π ± π  and B 0 ! π + π π 0 (ρ 0 π 0 ). We find evidence at the 3.9σ level for large direct CP violation in the decay B ± ! ρ(770) 0 K ± . This is the first evidence for CP violation in a charged meson decay. We also find evidence of B 0 ! ρ 0 π 0 decay and perform the first measurement of the direct CP violating asymmetry in this mode. The measurements are based on a data sample that contains 386 million B ¯ B pairs collected with the Belle detector at the KEKB asymmetric-energy e + e (3.5 on 8.0 GeV) collider. KEKB operates at the ϒ(4S) resonance ( p s = 10.58 GeV) with a peak luminosity that exceeds 1.5× 10 34 cm 2 s 1 .

Belle: CPV with Kpipi/pipipi(rho pi)