Theoretical status of epsilon'/epsilon

Preprint

6 October 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/9910257

Abstract

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.

Keywords

THEORETICAL FORMALISM
DETAILED INTRODUCTION
THEORETICAL STATUS
STRANGE QUARK
CP VIOLATION
QUARK MASS
HADRONIC
EPSILON

All Related Versions

Version 1, 1999-10-06, ArXiv
Published version: Nuclear Physics B - Proceedings Supplements, 86 (1-3), 329.

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