No abstract

No abstract

Within the framework of Standard Model, the exclusive decay mode B → πγγ is studied. Although the usual short distance contribution is small compared to the similar B → Kγγ mode, the process offers the possibility of studying the CP violation, a feature absent in the B → K counterpart.

We study the neutral current flavour changing rare decay mode B → Kγγ within the framework of Standard Model, including the long distance contributions. It is found that these long distance contributions can be larger than the short distance contribution.