Production of neutrons in the vicinity of the pion pole

TL;DR

This paper reviews recent experimental results on neutron production near the pion pole in high-energy hadronic reactions, highlighting the significance of absorption effects and their impact on understanding pion properties.

Contribution

It provides a comprehensive overview of recent findings in neutron production processes, emphasizing the role of absorption effects in these reactions.

Findings

Absorption effects are stronger than previously estimated.

Neutron production near the pion pole offers insights into pion properties.

Polarization effects influence neutron production in high-energy collisions.

Abstract

High-energy hadronic reactions with proton-to-neutron transitions (and vice versa) with small momentum transfer allow to study the properties of nearly on-shell pions, which cannot be accessed otherwise. We overview the recent results for such processes in deeply inelastic scattering, single and double leading neutron production in pp collisions, including polarization effect. A special attention is paid to the absorption effects, which are found to be much stronger than what has been evaluated previously.