QCD Corrections to $b\to s\gamma \gamma$ and Exclusive $B_s\to \gamma \gamma$ Decay

Chia-Hung V. Chang, Guey-Lin Lin, York-Peng Yao

The short distance QCD corrections to $b\to s\gamma \gamma$ are calculated in the leading logarithmic approximation. The equivalence of operator basis reduction for S-matrix elements by using…