1/Nc and ε′/ε

2000/09/06 by T. Hambye, P. H. Soldan, P.H. Soldan
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/s0920-5632(01)01148-3

published as Nucl.Phys.Proc.Suppl. 96 (2001) 323-328 · 6 pages, Invited talk presented by T.H. at the QCD 00 High-Energy Physics International Euroconference in Quantum Chromodynamics, July 6-13th 2000, Montpellier, France

arxiv created 2000/09/06 · openalex publication_date 2001/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We present a recent analysis of epsilon'/epsilon in the 1/N_c expansion. We show that the 1/N_c corrections to the matrix element of Q₆ are large and positive, indicating a Delta I = 1/2 enhancement similar to the one of Q₁ and Q₂ which dominate the CP conserving amplitude. This enhances the CP ratio and can bring the standard model prediction close to the measured value for central values of the parameters. Several comments on the theoretical status of epsilon'/epsilon and the errors in its calculation are given.

Citations

• Standard model confronting new results for ε′/ε
• On the operator product expansion in noncommutative quantum field theory