Nucleon electric dipole moment and dimension-8 gluonic operators

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.283· OSTI ID:6522732

Chemtob, M ^[1]

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1. Service de Physique Theorique, CE-Saclay, F-91191 Gif-sur-Yvette CEDEX (France)

We examine the two-loop contributions to the dimension-8, [ital J][sup [ital P][ital C]]=0[sup [minus]+], gluonic operators in the multi-Higgs-boson extension of the standard model with [ital CP] violation occurring either in the neutral or in the charged scalar mesons sectors. Our calculational procedure is based on the background field method. We discuss the contribution to the nucleon electric dipole moment by means of an effective chiral Lagrangian approach. This is used to evaluate the basic hadronic matrix elements of the dimension-8 operators as well as the pion loop corrections. The discussion of numerical results encompasses the complete set of dimension-5, -6, and -8 [ital CP]-violating operators. It is found that the dimension-8 operators, through the contributions of the two-loop irreducible Feynman diagrams involving the bottom quark, are likely to dominate over the dimension-6 operators and to be comparable to the dimension-5 operators.

• OSTI ID: 6522732
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662390* -- Electromagnetic Processes & Properties-- (1992-)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANOMALOUS DIMENSION
BARYONS
CHIRAL SYMMETRY
CP INVARIANCE
DIPOLE MOMENTS
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
ELEMENTARY PARTICLES
FERMIONS
FIELD OPERATORS
FUNCTIONS
GLUON MODEL
HADRONS
INVARIANCE PRINCIPLES
LAGRANGIAN FUNCTION
MANY-DIMENSIONAL CALCULATIONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MATRIX ELEMENTS
NUCLEONS
PARTICLE MODELS
QUANTUM OPERATORS
SCALE DIMENSION
SYMMETRY
SYMMETRY BREAKING
UNIFIED GAUGE MODELS