Electromagnetic form factors of the {Omega}{sup -} in lattice QCD

Journal Article · Sun Aug 01 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.034504· OSTI ID:21432880

Alexandrou, C ^[1]; Korzec, T ^[2]; Koutsou, G ^[3]; Negele, J W ^[4]; Proestos, Y ^[5]

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1. Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus)
2. Humboldt Universitaet zu Berlin, Newtonstrasse 15, 12489 Berlin (Germany)
3. Juelich Supercomputing Center, Forschungszentrum Juelich, D-52425 Juelich (Germany)
4. Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
5. Computation-based Science and Technology Research Center, The Cyprus Institute, P.O. Box 27456, 1645 Nicosia (Cyprus)

We present results on the omega baryon ({Omega}{sup -}) electromagnetic form factors using N{sub f}=2+1 domain-wall fermion configurations for three pion masses in the range of about 350 to 300 MeV. We compare results obtained using domain-wall fermions with those of a mixed-action (hybrid) approach, which combines domain-wall valence quarks on staggered sea quarks, for a pion mass of about 350 MeV. We pay particular attention in the evaluation of the subdominant electric quadrupole form factor to sufficient accuracy to exclude a zero value, by constructing a sequential source that isolates it from the dominant form factors. The {Omega}{sup -} magnetic moment, {mu}{sub {Omega}}{sup -}, and the electric charge and magnetic radius, <r{sub E0/M1}{sup 2}>, are extracted for these pion masses. The electric quadrupole moment is determined for the first time using dynamical quarks.

• OSTI ID: 21432880
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
COMPARATIVE EVALUATIONS
CONFIGURATION
DIMENSIONLESS NUMBERS
ELECTRIC CHARGES
ELECTROMAGNETIC FORM FACTORS
ELEMENTARY PARTICLES
ENERGY RANGE
EVALUATION
FERMIONS
FIELD THEORIES
FORM FACTORS
HADRONS
HYPERONS
MAGNETIC MOMENTS
MASS
MATTER
MESONS
MEV RANGE
MEV RANGE 100-1000
OMEGA BARYONS
OMEGA MINUS PARTICLES
OMEGA PARTICLES
PARTICLE PROPERTIES
PIONS
PSEUDOSCALAR MESONS
QUADRUPOLE MOMENTS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MATTER
QUARKS
STRANGE PARTICLES