CP asymmetry, branching ratios and isospin breaking effects of B -> K*   gamma with the perturbative QCD approach
  The radiative B -> K* gamma mode is caused by a penguin operator which is a quantum correction. Thus this mode may be useful in the search for physics beyond the standard model. In this paper, we compute the branching ratio, direct CP asymmetry, and isospin breaking effects within the Standard Model in the framework perturbative QCD, and discuss how new physics might show up in this decay. 
M. Matsumori, A. I. Sanda, Y.-Y. Keum