Search for the Radiative Decays B-> rho gamma and B->omega gamma

A search for the exclusive radiative decays B → ρ(770)γ and B0 → ω(782)γ is performed on a sample of about 84 million B(bar B) events collected by the BABAR detector at the PEP-II asymmetric-energy e+e- storage ring. No significant signal is seen in any of the channels. We set upper limits on the branching fractions Β of Β(B0 → ρ0γ) < 1.2 x 10-6, Β(B+ → ρ+γ) < 2.1 x 10-6, and Β(B0 → ωγ) < 1.0 x 10-6 at 90% confidence level (C.L.). Using the assumption that Λ(B → ργ) = Λ(B+ → ρ+γ) = 2 x Λ(B0 → ρ0γ), they find the combined limit Β(B → ργ) < 1.9 x 10-6, corresponding to Β(B → ργ)/Β(B → ργ)/Β(B → K*γ) < 0.047 at 90% C.L