Branching ratio and CP asymmetry for B→11P1γ decays

We calculate the branching ratios for B→(b1,h1)γ at next-to-leading order (NLO) of αs where b1 and h1 are the corresponding orbitally excited axial vector mesons of ρ and ω respectively. Using the SU(3) symmetry for the form factors, the branching ratio for B→(b1,h1)γ is expressed in terms of the branching ratio of the B→K1γ and it is found to be B(B→b1γ)=0.53x10-6 and B(B→h1γ)=0.51x10-6. We also calculate direct CP-asymmetry for these decays and find that its typical values lies around 11% and is negative like ρ and ω in the standard model. The predicted value of CP-asymmetry, in confirmity with the observations made in the literature, is scale dependent which has also been discussed in detail