Observation of B meson decays to b(1)pi and b(1)K

We present the results of searches for decays of B mesons to final states with a b(1) meson and a charged pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 382x10(6) B(B)over bar pairs produced in e(+)e(-) annihilation. The results for the branching fractions are, in units of 10(-6), B(B(+) -> b(1)(0)pi(+)) = 6.7 +/- 1.7 +/- 1.0, B(B(+) -> b(1)(0)K(+)) = 9.1 +/- 1.7 +/- 1.0, B(B(0) -> b(1)(-/+)pi +/- ) = 10.9 +/- 1.2 +/- 0.9, and B(B(0) -> b(1)(-)K(+)) = 7.4 +/- 1.0 +/- 1.0, with the assumption that B(b(1) -> omega pi) = 1. We also measure charge and flavor asymmetries A(ch)(B(+) -> b(1)(0)pi(+)) = 0.05 +/- 0.16 +/- 0.02, A(ch)(B(+) -> b(1)(0)K(+)) = -0.46 +/- 0.20 +/- 0.02, A(ch)(B(0) -> b(1)(-/+)pi +/- ) = -0.05 +/- 0.10 +/- 0.02, C(B(0) -> b(1)(-/+)pi +/- ) = -0.22 +/- 0.23 +/- 0.05, Delta C(B(0) -> b(1)(-/+)pi +/- ) = -1.04 +/- 0.23 +/- 0.08, and A(ch)(B(0) -> b(1)(-)K(+)) = -0.07 +/- 0.12 +/- 0.02. The first error quoted is statistical, and the second systematic.