Dirac and Pauli form factors from lattice QCD

Roger Horsley; Sara  Collins; Meinulf Gockeler; Philipp Hagler; Yoshifumi Nakamura; Andrea Nobile; Dirk Pleiter; Paul Rakow; Andreas Schafer; Gerrit Schierholz; Frank Winter; James Zanotti

doi:10.1103/PhysRevD.84.074507

Dirac and Pauli form factors from lattice QCD

Roger Horsley, Sara Collins, Meinulf Gockeler, Philipp Hagler, Yoshifumi Nakamura, Andrea Nobile, Dirk Pleiter, Paul Rakow, Andreas Schafer, Gerrit Schierholz, Frank Winter, James Zanotti

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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_\pi ~ 180 MeV. We find that by employing Kelly-inspired parametrizations for the Q^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 non-analytic behavior in these fundamental observables

Original language	English
Pages (from-to)	074507
Number of pages	31
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	84
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.84.074507
Publication status	Published - 21 Oct 2011

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10.1103/PhysRevD.84.074507

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title = "Dirac and Pauli form factors from lattice QCD",

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_\pi ~ 180 MeV. We find that by employing Kelly-inspired parametrizations for the Q^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 non-analytic behavior in these fundamental observables",

author = "Roger Horsley and Sara Collins and Meinulf Gockeler and Philipp Hagler and Yoshifumi Nakamura and Andrea Nobile and Dirk Pleiter and Paul Rakow and Andreas Schafer and Gerrit Schierholz and Frank Winter and James Zanotti",

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T1 - Dirac and Pauli form factors from lattice QCD

AU - Horsley, Roger

AU - Collins, Sara

AU - Gockeler, Meinulf

AU - Hagler, Philipp

AU - Nakamura, Yoshifumi

AU - Nobile, Andrea

AU - Pleiter, Dirk

AU - Rakow, Paul

AU - Schafer, Andreas

AU - Schierholz, Gerrit

AU - Winter, Frank

AU - Zanotti, James

PY - 2011/10/21

Y1 - 2011/10/21

N2 - 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_\pi ~ 180 MeV. We find that by employing Kelly-inspired parametrizations for the Q^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 non-analytic behavior in these fundamental observables

AB - 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_\pi ~ 180 MeV. We find that by employing Kelly-inspired parametrizations for the Q^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 non-analytic behavior in these fundamental observables

U2 - 10.1103/PhysRevD.84.074507

DO - 10.1103/PhysRevD.84.074507

M3 - Article

VL - 84

SP - 074507

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 7

ER -

Dirac and Pauli form factors from lattice QCD

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