The relevance of the dipole penguin operators in ϵ′/ϵ

1993/12/31 by Stefano Bertolini, S. Bertolini, M. Fabbrichesi +2 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/0370-2693(94)91541-5

published as Phys.Lett.B327:136-144,1994 · 14 pages, LATEX, CERN-TH.7097/93 and SISSA 174/93/EP, (alternative evaluation of the hadronic matrix element and new tables)

arxiv created 1994/04/07 · openalex publication_date 1994/05/01 · arxiv updated 2010/11/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The standard model contribution to ε'/ε of the magnetic- and electric-dipole penguin operators Q₁₁ = (g_s)/(16π²) m_s s σ_μν t^a G^μν_a (1-γ₅ ) d and Q₁₂ = (eQ_d)/(16π²) m_s s σ_μν F^μν (1-γ₅ ) d is discussed. While the electromagnetic penguin Q₁₂ seems to have a vanishingly small matrix element, we find that the gluonic dipole operator Q₁₁ may give a contribution to ε'/ε comparable to that of other operators so far considered, and should therefore be consistently included in the analysis.

Cited by

• Supersymmetric corrections to ϵ′/ϵ at the leading order in QCD and QED
• Weak radiative decays of hyperons and of charm and beauty baryons