Hadron structure at small momentum transfer

TL;DR

This paper emphasizes the importance of studying hadron structure at low momentum transfer for understanding QCD, illustrating with examples like nucleon form factors, pion polarisability, and nucleon resonance interference.

Contribution

It highlights the significance of low momentum transfer studies in hadron physics through specific examples, advancing the understanding of QCD.

Findings

Nucleon form factors are crucial for hadron structure analysis.

Pion polarisability provides insights into hadronic responses.

Interference effects in nucleon resonances inform QCD studies.

Abstract

Giving three examples, the form factors of the nucleon, the polarisability of the charged pion and the interference of the $S_{11}(1535)$ with the $D_{13}(1520)$ excitation of the nucleon in the $\eta p$-decay channel, it is argued that the hadron structure at low momentum transfer is highly significant for studying QCD.