Color Coherent Phenomena with Hadron Beams

TL;DR

This paper discusses color coherence phenomena in hadron beams, highlighting recent theoretical and experimental advances, and proposes new experiments to further investigate color fluctuations and transparency in nuclear interactions.

Contribution

It introduces new methods for testing color coherence using light nuclei and suggests novel hard processes and experiments to explore color fluctuations in hadrons.

Findings

Evidence for color transparency in quasielastic processes

Observation of significant color fluctuations in nucleons and pions

Proposal of new three-particle final state processes for experiments

Abstract

We outline major ideas involved in discussion of color coherence phenomena (CCP) at intermediate energies. We point out that the recent advances in calculating cross sections of hard exclusive processes off light nuclei allow to use the lightest nuclei for sensitive tests of CCP. Consistency of the results of the measurements of color transparency in quasielastic A(p,2p) and A(e,e$'$p) processes is emphasized. Evidence for presence of significant color fluctuations in nucleons and pions emerging from the study of diffractive processes is summarized. A new class of hard processes leading to three particle final state is suggested for electron and hadron projectiles. A number of new experiments are suggested to probe color fluctuations in hadrons.