Nucleon electric dipole moment and gluonic content of light hadrons

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.1649· OSTI ID:7048861

Chemtob, M ^[1]

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

We discuss the contributions to the nucleon electric dipole moment {ital d}{sub {ital N}} associated with the flavor-diagonal purely gluonic and mixed quark-gluon {ital P}- and {ital CP}-violating {ital J}{sup {ital P}{ital C}}=0{sup {minus}+} operators. These include the dimension-5 and -6 operators, corresponding to the color-electric dipole moment of quarks and gluons, and the set of dimension-8 purely gluonic operators. The large-{ital N}{sub {ital c}} current-algebra ({eta}{sub 0}-meson dominance) approach relates the hadronic matrix elements of these higher-dimension operators to the amplitudes involving the dimension-4 topological field operator {ital Q}({ital x}){similar to}{ital G{tilde G}}. The basic parameters which appear in these relations correspond to the {eta}{sub 0}-meson decay coupling constants induced by the higher-dimension operators. These parameters determine the long-distance behavior of the mixed vacuum correlation function between {ital Q}({ital x}) and the higher-dimension operators. We evaluate these parameters by an application of the QCD sum-rule method. The treatment of dimension-8 operators is incomplete, due to a restriction to a subset of contributions to coefficient functions and to use of vacuum factorization. Estimates for {ital d}{sub {ital N}} are presented for the case where the {ital CP} violation is induced by the neutral Higgs sector of the two-Higgs-doublet extension of the standard model.

• OSTI ID: 7048861
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:5; ISSN PRVDA; 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-)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
CP INVARIANCE
CURRENT ALGEBRA
DIPOLE MOMENTS
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
FUNCTIONS
GLUONS
HADRONS
INVARIANCE PRINCIPLES
LAGRANGIAN FUNCTION
NUCLEONS
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SUM RULES