Decuplet baryon structure from lattice QCD

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.3067· OSTI ID:7157973

Leinweber, D B ^[1]; Draper, T ^[2]; Woloshyn, R M ^[3]

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1. Department of Physics and Center for Theoretical Physics, University of Maryland, College Park, Maryland 20742 (United States) TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)
2. Department of Phyics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
3. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)

The electromagnetic properties of the SU(3)-flavor baryon decuplet are examined within a lattice simulation of quenched QCD. Electric charge radii, magnetic moments, and magnetic radii are extracted from the {ital E}0 and {ital M}1 form factors. Preliminary results for the {ital E}2 and {ital M}3 moments are presented, giving the first model-independent insight to the shape of the quark distribution in the baryon ground state. As in our octet-baryon analysis, the lattice results give evidence of spin-dependent forces and mass effects in the electromagnetic properties. The quark charge distribution radii indicate these effects act in opposing directions. Some baryon dependence of the effective quark magnetic moments is seen. However, this dependence in decuplet baryons is more subtle than that for octet baryons. Of particular interest are the lattice predictions for the magnetic moments of {Omega}{sup {minus}} and {Delta}{sup ++} for which new recent experimental measurements are available. The lattice prediction of the {Delta}{sup ++}/{ital p} ratio appears larger than the experimental ratio, while the lattice prediction for the {Omega}{sup {minus}}/{ital p} magnetic moment ratio is in good agreement with the experimental ratio.

• DOE Contract Number: FG05-87ER40322; FG05-84ER40154
• OSTI ID: 7157973
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 46:7; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
QUARK MODEL
QUANTUM CHROMODYNAMICS
CHARGE DISTRIBUTION
E0-TRANSITIONS
E2-TRANSITIONS
ELECTROMAGNETIC FORM FACTORS
FLAVOR MODEL
LATTICE FIELD THEORY
M1-TRANSITIONS
M3-TRANSITIONS
MAGNETIC MOMENTS
MATRIX ELEMENTS
SU GROUPS
SU-2 GROUPS
SUM RULES
COMPOSITE MODELS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EQUATIONS
FERMIONS
FIELD THEORIES
FORM FACTORS
HADRONS
LIE GROUPS
MATHEMATICAL MODELS
MULTIPOLE TRANSITIONS
PARTICLE MODELS
PARTICLE PROPERTIES
QUANTUM FIELD THEORY
SYMMETRY GROUPS
662230* - Quantum Chromodynamics- (1992-)
662120 - General Theory of Particles & Fields- Symmetry
Conservation Laws
Currents & Their Properties- (1992-)
662390 - Electromagnetic Processes & Properties- (1992-)