Abstract
With the perturbative QCD approach based on k{sub T} factorization, we study the pure annihilation type radiative decays B{sup 0}{yields}{phi}{gamma} and B{sup 0}{yields}J/{psi}{gamma}. We find that the branching ratio of B{sup 0}{yields}{phi}{gamma} is (2.7{sub -0.6-0.6}{sup +0.3+1.2})x10{sup -11}, which is too small to be measured in the current B factories of BABAR and Belle. The branching ratio of B{sup 0}{yields}J/{psi}{gamma} is (4.5{sub -0.5-0.6}{sup +0.6+0.7})x10{sup -7}, which is just at the corner of being observable in the B factories. A larger branching ratio BR(B{sub s}{sup 0}{yields}J/{psi}{gamma}){approx_equal}5x10{sup -6} is also predicted. These decay modes will help us in testing the standard model and searching for new physics signals.
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