Baryon Form Factors

TL;DR

This paper reviews the current understanding of baryon form factors, focusing on nucleon electromagnetic form factors, their dispersive analysis, uncertainties, and the physics of time-like and hyperon form factors.

Contribution

It provides a comprehensive review of baryon form factors, emphasizing dispersive analysis techniques, uncertainty quantification, and recent developments in understanding nucleon and hyperon form factors.

Findings

Updated spectral functions with uncertainty estimates

Insights into time-like form factors and their physics

Discussion on hyperon form factors and pion cloud effects

Abstract

We review the status of baryon form factors with a special focus on the nucleon electromagnetic form factors which are known best. First, we give an introduction into the dispersive analyses and emphasize the role of unitarity and analyticity in the construction of the isoscalar and isovector spectral functions. Second, we present the state of the art in our understanding of nucleon form factors and radii including reliable uncertainty estimates from bootstrap and Bayesian methods. Third, we discuss the physics of the time-like form factors and point out further issues to be addressed in this framework. Finally, we review the status of hyperon form factors and comment on the pion cloud.