2006/05/31 by C. Alexandrou, Constantia Alexandrou, Giannis Koutsou +4 · 6 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.74.034508
published as Phys.Rev.D74:034508,2006 · Typos corrected, one reference added, version accepted for publication in Phys. Rev. D, 14 pages, 20 figures
arxiv created 2006/07/24 · openalex publication_date 2006/08/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \ensuremathβ=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 \ensuremathβ=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.