Theoretical status of epsilon'/epsilon

Details Theoretical status of epsilon'/epsilon Theoretical status of epsilon'/epsilon

1999-10-06

arxiv.org/abs/hep-ph/9910257v1

Nucl.Phys.Proc.Suppl.86:329-338,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures, Talk at QCD 99, Montpellier, uses fleqn,espcrc2,epsf,rotate,times

Scientific paper

10.1016/S0920-5632(00)00583-1

I give a detailed introduction into the theoretical formalism for epsilon'/epsilon, which measures direct CP-violation in K -> pi pi decays. The current status of hadronic matrix elements and the strange quark mass is discussed. Several possible explanations of the unexpectedly high experimental results for epsilon'/epsilon are pointed out: A small strange quark mass, an enhancement of the hadronic parameter B_6^(1/2) from the sigma resonance, an underestimate of isospin breaking and possible new physics contributions in the sdZ-vertex and the sd-gluon-vertex.

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