51,480 research outputs found
QCD Corrections to and Exclusive Decay
The short distance QCD corrections to 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
decay. The branching ratio of this decay is found to be
in the Standard Model. We also found that QCD corrections
modify considerably the ratio between CP-even and CP-odd two-photon amplitudes.Comment: revtex, 15 pages, 2 figures; revised version with corrections from
electroweak penguin discussed, the conclusion remains unchange
- …