QCD Corrections to $b\to sγγ$ and Exclusive $B_s\to γγ$ Decay

Details QCD Corrections to $b\to sγγ$ and Exclusive $B_s\to γγ$ Decay QCD Corrections to $b\to sγγ$ and Exclusive $B_s\to γγ$ Decay

1997-05-18

arxiv.org/abs/hep-ph/9705345v3

Phys.Lett. B415 (1997) 395-401

Physics

High Energy Physics

High Energy Physics - Phenomenology

revtex, 15 pages, 2 figures; revised version with corrections from electroweak penguin discussed, the conclusion remains uncha

Scientific paper

10.1016/S0370-2693(97)01208-2

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 the equations of motion or by proving a low energy theorem is discussed. We apply the above results to the exclusive $B_s\to \gamma\gamma$ decay. The branching ratio of this decay is found to be $5\times 10^{-7}$ in the Standard Model. We also found that QCD corrections modify considerably the ratio between CP-even and CP-odd two-photon amplitudes.

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