On the nonperturbative solution of Pauli-Villars-regulated light-front QED: A comparison of the sector-dependent and standard parameterizations

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Annals of Physics (New York)

DOI:https://doi.org/10.1016/j.aop.2010.05.006· OSTI ID:21452962

Chabysheva, Sophia S ^[1]

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1. Department of Physics, University of Minnesota-Duluth, Duluth, MN 55812 (United States)

We consider quantum electrodynamics quantized on the light front in Feynman gauge and regulated in the ultraviolet by the inclusion of massive, negative-metric Pauli-Villars (PV) particles in the Lagrangian. The eigenstate of the electron is approximated by a Fock-state expansion truncated to include one photon. The Fock-state wave functions are computed from the fundamental Hamiltonian eigenvalue problem and used to calculate the anomalous magnetic moment, as a point of comparison. Two approaches are considered: a sector-dependent parameterization, where the bare parameters of the Lagrangian are allowed to depend on the Fock sectors between which the particular Hamiltonian term acts, and the standard choice, where the bare parameters are the same for all sectors. Both methods are shown to require some care with respect to ultraviolet divergences; neither method can allow all PV masses to be taken to infinity. In addition, the sector-dependent approach suffers from an infrared divergence that requires a nonzero photon mass; due to complications associated with this divergence, the standard parameterization is to be preferred. We also show that the self-energy effects obtained from a two-photon truncation are enough to bring the standard-parameterization result for the anomalous moment into agreement with experiment within numerical errors. This continues the development of a method for the nonperturbative solution of strongly coupled theories, in particular quantum chromodynamics.

• OSTI ID: 21452962
• Journal Information: Annals of Physics (New York), Journal Name: Annals of Physics (New York) Journal Issue: 11 Vol. 325; ISSN 0003-4916; ISSN APNYA6
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPARATIVE EVALUATIONS
EIGENVALUES
ELECTRODYNAMICS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY
EVALUATION
FERMIONS
FIELD THEORIES
FUNCTIONS
HAMILTONIANS
INFRARED DIVERGENCES
LAGRANGIAN FUNCTION
LEPTONS
LIGHT CONE
MAGNETIC MOMENTS
MASSLESS PARTICLES
MATHEMATICAL OPERATORS
MATHEMATICAL SOLUTIONS
METRICS
PHOTONS
QUANTIZATION
QUANTUM CHROMODYNAMICS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
QUANTUM OPERATORS
RADIATIONS
SELF-ENERGY
SPACE-TIME
ULTRAVIOLET DIVERGENCES
ULTRAVIOLET RADIATION
WAVE FUNCTIONS