Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-06-08
Eur.Phys.J.ST 198:79-94,2011
Physics
High Energy Physics
High Energy Physics - Lattice
16 pages, 11 figures, presented at Conclusive Symposium, CRC443, "Many-body structure of strongly interacting systems", 23-25
Scientific paper
10.1140/epjst/e2011-01484-1
Lattice simulations of QCD have produced precise estimates for the masses of the lowest-lying hadrons which show excellent agreement with experiment. By contrast, lattice results for the vector and axial vector form factors of the nucleon show significant deviations from their experimental determination. We present results from our ongoing project to compute a variety of form factors with control over all systematic uncertainties. In the case of the pion electromagnetic form factor we employ partially twisted boundary conditions to extract the pion charge radius directly from the linear slope of the form factor near vanishing momentum transfer. In the nucleon sector we focus specifically on the possible contamination from contributions of higher excited states. We argue that summed correlation functions offer the possibility of eliminating this source of systematic error. As an illustration of the method we discuss our results for the axial charge, gA, of the nucleon.
Brandt Bastian B.
Capitani Stefano
Djukanovic D.
Gegelia Jambul
Jüttner Andreas
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