Dirac and Pauli form factors from lattice QCD

Journal Article · Sat Oct 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.074507· OSTI ID:21607802

Collins, S; Goeckeler, M; Nobile, A; Schaefer, A ^[1]; Haegler, Ph ^[2]; Horsley, R; Winter, F; Zanotti, J M ^[3]; Nakamura, Y ^[4]; Pleiter, D ^[5]; Rakow, P E. L. ^[6]; Schierholz, G ^[1]; Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg ^[7]; Schroers, W ^[8]; Stueben, H ^[9]

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1. Institut fuer Theoretische Physik, Universitaet Regensburg, 93040 Regensburg (Germany)
2. Institut fuer Kernphysik, Johannes Gutenberg-Universitaet Mainz, 55128 Mainz (Germany)
3. School of Physics, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
4. RIKEN Advanced Institute for Computational Science, Kobe, Hyogo 650-0047 (Japan)
5. JSC, Research Center Juelich, 52425 Juelich (Germany)
6. Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX (United Kingdom)
7. Germany
8. Numerik and Analyse Schroers, Stubenrauchstr. 3, 12357 Berlin (Germany)
9. Konrad-Zuse-Zentrum fuer Informationstechnik Berlin, 14195 Berlin (Germany)

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 {pi}{approx}1}80 MeV. We find that by employing Kelly-inspired parametrizations for the Q{sup 2} 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.

• OSTI ID: 21607802
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 7; Other Information: DOI: 10.1103/PhysRevD.84.074507; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRALITY
COMPUTERIZED SIMULATION
CONFIGURATION
D QUARKS
DIRAC FORM FACTORS
ELECTROMAGNETIC FORM FACTORS
FLAVOR MODEL
LATTICE FIELD THEORY
MAGNETIC MOMENTS
MASS
MEV RANGE 100-1000
NUCLEONS
PAULI FORM FACTORS
PIONS
QUANTUM CHROMODYNAMICS
U QUARKS
BARYONS
BOSONS
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
FORM FACTORS
HADRONS
MATHEMATICAL MODELS
MESONS
MEV RANGE
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
SIMULATION