Precision electromagnetic structure of octet baryons in the chiral regime

Journal Article · Wed Nov 01 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.093005· OSTI ID:20873118

Boinepalli, S; Leinweber, D B; Williams, A G ^[1]; Zanotti, J M ^[1]; Zhang, J B ^[1]

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1. Special Research Centre for the Subatomic Structure of Matter and Department of Physics, University of Adelaide 5005 (Australia)

The electromagnetic properties of the baryon octet are calculated in quenched QCD on a 20{sup 3}x40 lattice with a lattice spacing of 0.128 fm using the fat-link irrelevant clover (FLIC) fermion action. FLIC fermions enable simulations to be performed efficiently at pion masses as low as 300 MeV. By combining FLIC fermions with an improved-conserved vector current, we ensure that discretization errors occur only at O(a{sup 2}) while maintaining current conservation. Magnetic moments and electric and magnetic radii are extracted from the electric and magnetic form factors for each individual quark sector. From these, the corresponding baryon properties are constructed. Our results are compared with the predictions of quenched chiral perturbation theory. We detect substantial curvature and environment sensitivity of the quark contributions to electric charge radii and magnetic moments in the low quark-mass region.

• OSTI ID: 20873118
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 74; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ACTION INTEGRAL
BARYON OCTETS
BARYONS
CHIRALITY
COMPUTERIZED SIMULATION
ELECTRIC CHARGES
LATTICE FIELD THEORY
MAGNETIC MOMENTS
PERTURBATION THEORY
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
REST MASS
SENSITIVITY
VECTOR CURRENTS