Extracting nucleon magnetic moments and electric polarizabilities from lattice QCD in background electric fields

Journal Article · Mon Mar 01 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.054502· OSTI ID:21409870

Detmold, W ^[1]; Tiburzi, B C ^[2]; Walker-Loud, A ^[1]

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1. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187-8795 (United States)
2. Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)

Nucleon properties are investigated in background electric fields. As the magnetic moments of baryons affect their relativistic propagation in constant electric fields, electric polarizabilities cannot be determined without knowledge of magnetic moments. This is analogous to the experimental situation, for which determination of polarizabilities from the Compton amplitude requires subtraction of Born terms. With the background field method, we devise combinations of nucleon correlation functions in constant electric fields that isolate magnetic moments and electric polarizabilities. Using an ensemble of anisotropic gauge configurations with dynamical clover fermions, we demonstrate how both observables can be determined from lattice QCD simulations in background electric fields. We obtain results for the neutron and proton, however, our study is currently limited to electrically neutral sea quarks. The value we extract for the nucleon isovector magnetic moment is comparable to those obtained from measuring lattice three-point functions at similar pion masses.

• OSTI ID: 21409870
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevD.81.054502; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANISOTROPY
CORRELATION FUNCTIONS
ELECTRIC FIELDS
MAGNETIC MOMENTS
MASS
NEUTRONS
PIONS
POLARIZABILITY
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
RELATIVISTIC RANGE
SIMULATION
BARYONS
BOSONS
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
FUNCTIONS
HADRONS
MESONS
NUCLEONS
PHYSICAL PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY