Determination of baryon magnetic moments from QCD sum rules

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.33.1961· OSTI ID:6058347

Chiu, C B; Pasupathy, J; Wilson, S J

The magnetic moment ..mu../sub B/ of a baryon B with quark content (aab) is written as ..mu../sub B/ = 4e/sub a/(1+delta/sub B/)eh/2cM/sub B/, where e/sub a/ is the charge of the quark of flavor type a. The experimental values of delta/sub B/ have a simple pattern and have a natural explanation within QCD. Using the ratio method, the QCD sum rules are analyzed and the values of delta/sub B/ are computed. We find good agreement with data (roughly-equal10%) for the nucleons and the ..sigma.. multiplet while for the cascade the agreement is not as good. In our analysis we have incorporated additional terms in the operator-product expansion as compared to previous authors. We also clarify some points of disagreement between the previous authors. External-field-induced correlations describing the magnetic properties of the vacuum are estimated from the baryon magnetic-moment sum rules themselves as well as by independent spectral representations and the results are contrasted.

• Research Organization: Center for Particle Theory, The University of Texas at Austin, Austin, Texas 78712
• DOE Contract Number: AS05-76ER03992
• OSTI ID: 6058347
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 33:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHIRALITY
COMPOSITE MODELS
CORRELATION FUNCTIONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
FLAVOR MODEL
FUNCTIONS
HADRONS
MAGNETIC MOMENTS
MASS SPECTRA
MATHEMATICAL MODELS
NUCLEONS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUANTUM NUMBERS
QUARK MODEL
QUARKS
SPECTRA
SUM RULES