Pion form factors

TL;DR

This paper analyzes pion electromagnetic and transition form factors across different energy regions, introducing a new Regge fermion exchange mechanism and emphasizing the dominance of hadronic contributions at current energies.

Contribution

It presents a unified description of pion form factors using dispersion relations and introduces a novel Regge fermion exchange mechanism for high-energy behavior.

Findings

Hadronic contributions dominate at all current energies.

A new Regge fermion exchange mechanism is proposed for asymptotic behavior.

Unified description of form factors across energy regions.

Abstract

We consider the electromagnetic and transition pion form factors. Using dispersion relations we simultaneously describe both the hadronic, time-like region and the asymptotic region of large energy-momentum transfer. For the latter we propose a novel mechanism of Regge fermion exchange. We find that hadronic contributions dominate form factors at all currently available energies.