Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2012-01-30
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 12 figures
Scientific paper
Lattice quantum chromodynamics (QCD) simulations have made significant progress in the calculation of nucleon electromagnetic form factors in the chiral regime in recent years. With simulation results achieving pion masses of order ~180 MeV, there is an apparent challenge as to how the physical regime is approached. By using contemporary methods in chiral effective field theory, both the quark-mass and finite-volume dependence of the isovector nucleon magnetic moment are carefully examined. The extrapolation to the physical point yields a result that is compatible with experiment, albeit with a combined statistical and systematic uncertainty of 10%. The extrapolation shows a strong finite-volume dependence; lattice sizes of L > 5 fm must be used to simulate results within 2% of the infinite-volume result for the magnetic moment at the physical pion mass.
Hall Jonathan M. M.
Leinweber Derek B. .
Young Richard D.
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