QCD (Quantum Chromodynamics) Corrections to Weak Decays.

摘要

Weak decays are significantly altered by effects of strong interaction. In the K system these corrections give rise to (Delta)I = 1/2 rule, and have measurable effects on rare weak process like K(yields)(pi)(nu)(bar (nu)), K(yields)(pi)e(sup +)e(sup (minus)) and (var epsilon)(prime)/(var epsilon). The situation in the K system is briefly reviewed. Strong interaction effects are also important in D and B system. A possible mechanism for D(sup +)-D(sup 0) life-time difference is reviewed and then rare B processes are dealt with extensively. Electromagnetic penguin diagrams are enhanced by QCD corrections, giving rise to process like B(yields)K(sup (asterisk))(gamma) and B(yields)Ke(sup +)e(sup (minus)). Process mediated by gluon penguins are also discussed. 24 refs., 8 figs.