The Weak OPE and Dimension-eight Operators

Details The Weak OPE and Dimension-eight Operators The Weak OPE and Dimension-eight Operators

2000-08-31

arxiv.org/abs/hep-ph/0008338v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, using macro ws-p10x7.cls, talk presented at ICHEP2000 (Osaka, Japan)

Scientific paper

We discuss recent work which identifies a potential flaw in standard treatments of weak decay amplitudes, including that of epsilon'/epsilon. The point is that (contrary to conventional wisdom) dimension-eight operators contribute to weak amplitudes at order G_F alpha_s and without 1/M_W^2 suppression. The effect of dimension-eight operators is estimated to be at the 100% level in a sum rule determination of the operator Q_7^(6) at mu = 1.5 GeV, suggesting that presently available values of mu are too low to justify the neglect of these effects.

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