Electromagnetic moments of the baryon decuplet

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.3459· OSTI ID:5018676

Butler, M N ^[1]; Savage, M J ^[2]; Springer, R P ^[3]

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1. Department of Physics, Stirling Hall, Queen's University, Kingston, K7L 3N6 (Canada)
2. Department of Physics, University of California-San Diego, La Jolla, California 92093-0319 (United States)
3. Department of Physics, Duke University, Durham, North Carolina 27708 (United States)

We compute the leading contributions to the magnetic dipole and electric quadrupole moments of the baryon decuplet in chiral perturbation theory. The measured value for the magnetic moment of the [Omega][sup [minus]] is used to determine the local counterterm for the magnetic moments. We compare the chiral perturbation theory predictions for the magnetic moments of the decuplet with those of the baryon octet and find reasonable agreement with the predictions of the large-[ital N][sub [ital c]] limit of QCD. The leading contribution to the quadrupole moment of the [Delta] and other members of the decuplet comes from one-loop graphs. The pionic contribution is shown to be proportional to [ital I][sub [ital z]] (and so will not contribute to the quadrupole moment of [ital I]=0 nuclei), while the contribution from kaons has both isovector and isoscalar components. The chiral logarithmic enhancement of both pion and kaon loops has a coefficient that vanishes in the SU(6) limit. The third allowed moment, the magnetic octupole, is shown to be dominated by a local counterterm with corrections arising at two loops. We briefly mention the strange counterparts of these moments.

• DOE Contract Number: FG05-90ER40592
• OSTI ID: 5018676
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 49:7; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON DECUPLETS
ELECTRIC MOMENTS
MAGNETIC MOMENTS
QUANTUM CHROMODYNAMICS
CHIRAL SYMMETRY
OMEGA BARYONS
PERTURBATION THEORY
QUADRUPOLE MOMENTS
SU-6 GROUPS
BARYONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
HYPERONS
LIE GROUPS
MULTIPLETS
PARTICLE MULTIPLETS
QUANTUM FIELD THEORY
STRANGE PARTICLES
SU GROUPS
SYMMETRY
SYMMETRY GROUPS
662390* - Electromagnetic Processes & Properties- (1992-)