Modeling electromagnetic form factors of light and heavy pseudoscalar mesons

TL;DR

This paper compares two covariant models to calculate electromagnetic form factors of light and heavy pseudoscalar mesons, analyzing how model choices affect key hadronic observables like decay constants and charge radii.

Contribution

It provides a detailed comparison of light-front and dispersion relation approaches in modeling meson form factors, highlighting model dependencies.

Findings

Model dependence significantly affects form factor predictions.

Weak decay constants vary with the modeling approach.

Charge radii and electromagnetic form factors are sensitive to the chosen model.

Abstract

The electromagnetic form factors of light and heavy pseudoscalar mesons are calculated within two covariant constituent-quark models, a light-front and a dispersion relation approach. We investigate the details and physical origins of the model dependence of various hadronic observables: the weak decay constant, the charge radius and the elastic electromagnetic form factor.