Nucleon electromagnetic form factors from lattice QCD

Journal Article · Tue Aug 01 04:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.034508· OSTI ID:20869267

Alexandrou, C; Koutsou, G ^[1]; Negele, J W ^[2]; Tsapalis, A ^[3]

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1. Department of Physics, University of Cyprus, CY-1678 Nicosia (Cyprus)
2. Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
3. Institute for Accelerating Systems and Applications, University of Athens, Athens (Greece)

We evaluate the isovector nucleon electromagnetic form factors in quenched and unquenched QCD on the lattice using Wilson fermions. In the quenched theory we use a lattice of spatial size 3 fm at {beta}=6.0 enabling us to reach low momentum transfers and a lowest pion mass of about 400 MeV. In the unquenched theory we use two degenerate flavors of dynamical Wilson fermions on a lattice of spatial size 1.9 fm at {beta}=5.6 and lowest pion mass of about 380 MeV enabling comparison with the results obtained in the quenched theory. that unquenching effects are small for the pion masses considered in this work. We compare our lattice results to the isovector part of the experimentally measured form factors.

• OSTI ID: 20869267
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 74; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC FORM FACTORS
FLAVOR MODEL
ISOVECTORS
LATTICE FIELD THEORY
MEV RANGE
MOMENTUM TRANSFER
NUCLEONS
PIONS
QUANTUM CHROMODYNAMICS
REST MASS