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We present the measurement, performed by the BABAR Collaboration, of the weakphase alpha from the time dependent CP asymmetries in B0--> a_1(1260)+- pi-+decays. The model error induced by penguin contributions to the B0 -->a_1(1260)+- pi-+ channel is estimated from an SU(3) analysis of the branchingfractions of B--> a_1(1260) K, B--> K_1(1270) pi, and B--> K_1(1400) pi decays.

Measurement of the weak phase alpha from B0 --> a_1(1260)+- pi-+ decays