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We report a Dalitz-plot analysis of the charmless hadronic decays of chargedB mesons to the final state K+/- pi+/- pi-/+. Using a sample of 383.2 +/- 4.2million BBbar pairs collected by the BaBar detector, we measure CP-averagedbranching fractions and direct CP asymmetries for intermediate resonant andnonresonant contributions. We find evidence for direct CP violation in thedecay B+ -> rho0(770) K+, with a CP violation parameter A_CP = (+44 +/- 10 +/-4 +5,-13)%.

Evidence for Direct CP Violation from Dalitz-plot analysis of B+/- -> K+/- pi+/- pi-/+