{delta}-baryon electromagnetic form factors in lattice QCD

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.014507· OSTI ID:21254726

Alexandrou, C; Korzec, T; Koutsou, G; Leontiou, Th ^[1]; Lorce, C; Pascalutsa, V; Vanderhaeghen, M ^[2]; Negele, J W ^[3]; Tsapalis, A ^[4]

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1. Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus)
2. Institut fuer Kernphysik, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)
3. Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
4. Institute of Accelerating Systems and Applications, University of Athens P.O. Box 17214, GR-10024, Athens (Greece)

We develop techniques to calculate the four {delta} electromagnetic form factors using lattice QCD, with particular emphasis on the subdominant electric quadrupole form factor that probes deformation of the {delta}. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mixed action combining domain-wall valence quarks and dynamical staggered sea quarks. The magnetic moment of the {delta} is compared with chiral effective field theory calculations and the {delta} charge density distributions are discussed.

• OSTI ID: 21254726
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHARGE DENSITY
CHIRALITY
DEFORMATION
DISTRIBUTION
ELECTROMAGNETIC FORM FACTORS
FLAVOR MODEL
LATTICE FIELD THEORY
MAGNETIC MOMENTS
MASS
MEV RANGE 100-1000
PIONS
QUADRUPOLES
QUANTUM CHROMODYNAMICS
QUARKS