Electromagnetic and gravitational form factors in simulated QED and Yukawa model

TL;DR

This paper investigates electromagnetic and gravitational form factors in simulated QED and Yukawa models using light-cone Fock states, analyzing properties like the anomalous gravitomagnetic moment and Pauli form factor.

Contribution

It introduces a method to improve wavefunction convergence and tests form factor behaviors in simulated and Yukawa models, enhancing understanding of composite systems.

Findings

Behavior of anomalous gravitomagnetic moment analyzed

Pauli form factor from spin-flip matrix element discussed

Wavefunction differentiation improves convergence

Abstract

The light-cone Fock state representation of composite systems has number of remarkable properties and for systems such as hadrons they have exact representation for angular momentum, energy momentum tensor. We investigate the electromagnetic and gravitational form factors with zero momentum transfer in QED and Yukawa theory. To improve the convergence near the end points of $x$ qualitatively as well as to check the consistency of the model, we differentiate the wavefunction w.r.t. bound state mass. We test the behaviour of the anomalous gravitomagnetic moment, which follows directly from the Lorentz boost properties of the light-cone Fock representation, for the simulated model as well as the Yukawa model. We also discuss the Pauli form factor obtained from the spin-flip matrix element.