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With the perturbative QCD approach based on $k_T$ factorization, we study thepure annihilation type radiative decays $B^0 \to \phi\gamma$ and $B^0\to J/\psi\gamma$. We find that the branching ratio of $B^0 \to \phi\gamma$ is$(2.7^{+0.3+1.2}_{-0.6-0.6})\times10^{-11}$, which is too small to be measuredin the current $B$ factories of BaBar and Belle. The branching ratio of $B^0\toJ/\psi \gamma$ is $({4.5^{+0.6+0.7}_{-0.5-0.6}})\times10^{-7}$, which is justat the corner of being observable in the $B$ factories. A larger branchingratio $BR(B_s^0 \to J/\psi \gamma) \simeq 5 \times 10^{-6}$ is also predicted.These decay modes will help us testing the standard model and searching for newphysics signals.Comment: 4 pages, revtex, with 1 eps figur

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Annihilation type radiative decays of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>meson in perturbative QCD approach

Annihilation type radiative decays ofBmeson in perturbative QCD approach