u-Channel Color Transparency Observables

TL;DR

This paper proposes studying color transparency in backward exclusive reactions using nuclear targets, building on JLab results, to explore early scaling regimes and the onset of nuclear transparency effects.

Contribution

It introduces a novel approach to investigate color transparency through backward electro-production channels on nuclear targets, extending previous findings.

Findings

Backward pion and omega electro-production data suggest early scaling behavior.

Nuclear targets provide a new way to test color transparency effects.

The approach offers insights into the transition to color transparency in QCD.

Abstract

We propose to study the onset of color transparency in hard exclusive reactions in the backward regime. Guided by the encouraging JLab results on backward pion and omega electro-production data at moderate Q^2, which may be interpreted as the signal of an early scaling regime where the scattering amplitude factorizes in a hard coefficient function convoluted with nucleon to meson transition distribution amplitudes, we show that the study of these channels on nuclear targets opens a new opportunity to test the appearance of nuclear color transparency for a fast moving nucleon.