Amplitude Analysis of the B±→φK*(892)± Decay

We perform an amplitude analysis of B^±→φ(1020)K^*(892)^± decay with a sample of about 384×10⁶ BB¯ pairs recorded with the BABAR detector. Overall, twelve parameters are measured, including the fractions of longitudinal f_L and parity-odd transverse f_⊥ amplitudes, branching fraction, strong phases, and six parameters sensitive to CP violation. We use the dependence on the Kπ invariant mass of the interference between the J^P=1^- and 0⁺ Kπ components to resolve the discrete ambiguity in the determination of the strong and weak phases. Our measurements of f_L=0.49±0.05±0.03, f_⊥=0.21±0.05±0.02, and the strong phases point to the presence of a substantial helicity-plus amplitude from a presently unknown source.