u-Channel Color Transparency Observables

Abstract

The paper proposes to study the onset of color transparency in hard exclusive reactions in the backward regime. Guided by the encouraging Jefferson Laboratory (JLab) results on backward π and ω electroproduction data at moderate virtuality Q2, 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, the study shows that investigations of these channels on nuclear targets opens a new opportunity to test the appearance of nuclear color transparency for a fast-moving nucleon.

Nuclear C(e, e′p) Transparencies in a Relativistic Glauber Model

“…To shed further light on the CT situation for the proton, measurements at higher momentum transfers at hadron beam facilities can provide additional data. Additionally proton knockout can be measured in different kinematics; see, e.g., [23]. As a further theoretical study one can explore the parameter space of the quantum diffusion model in great detail and identify those parameter values that are compatible with the 12 C(e, e p) measurements of Figure 1, but still lead to an observable change in the expected FSI in quasielastic deuteron breakup.…”