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Type: Journal article
Title: Dirac and Pauli form factors from lattice QCD
Author: Collins, S.
Gockeler, M.
Hagler, P.
Horsley, R.
Nakamura, Y.
Nobile, A.
Pleiter, D.
Rakow, P.
Schafer, A.
Schierholz, G.
Schroers, W.
Stüben, H.
Winter, F.
Zanotti, J.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2011; 84(7):074507:1-074507:28
Publisher: American Physical Soc
Issue Date: 2011
ISSN: 1550-7998
Statement of
S. Collins, M. Göckeler, Ph. Hägler, R. Horsley, Y. Nakamura, A. Nobile, D. Pleiter, P. E. L. Rakow, A. Schäfer, G. Schierholz W. Schroers, H. Stüben, F. Winter, and J. M. Zanotti (QCDSF/UKQCD Collaboration)
Abstract: We present a comprehensive analysis of the electromagnetic form factors of the nucleon from a lattice simulation with two flavors of dynamical O(a)-improved Wilson fermions. A key feature of our calculation is that we make use of an extensive ensemble of lattice gauge field configurations with four different lattice spacings, multiple volumes, and pion masses down to m(sub)π∼180  MeV. We find that by employing Kelly-inspired parametrizations for the Q² dependence of the form factors, we are able to obtain stable fits over our complete ensemble. Dirac and Pauli radii and the anomalous magnetic moments of the nucleon are extracted and results at light quark masses provide evidence for chiral nonanalytic behavior in these fundamental observables.
Rights: © 2011 American Physical Society
RMID: 0020120158
DOI: 10.1103/PhysRevD.84.074507
Appears in Collections:Chemistry and Physics publications

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