Light-cone sum rule approach for Baryon form factors

TL;DR

This paper reviews the light-cone sum rule method for calculating baryon form factors, emphasizing the use of distribution amplitudes derived from nucleon wave functions and their comparison with experimental and lattice data.

Contribution

It provides a comprehensive overview of the current state of the light-cone sum rule approach for baryon form factors, highlighting its parameter-free formulation and potential for extracting nucleon distribution amplitudes.

Findings

Distribution amplitudes can be extracted from experimental data.

The approach allows comparison with lattice QCD results.

Form factors are expressed in terms of small transverse distance quantities.

Abstract

We present the state-of-the-art of the light-cone sum rule approach to Baryon form factors. The essence of this approach is that soft Feynman contributions are calculated in terms of small transverse distance quantities using dispersion relations and duality. The form factors are thus expressed in terms of nucleon wave functions at small transverse separations, called distribution amplitudes, without any additional parameters. The distribution amplitudes, therefore, can be extracted from the comparison with the experimental data on form factors and compared to the results of lattice QCD simulations.