Multiple rescattering effects in the hard knockout reaction $\mathbf{^2\mbox{H}(p,2p)n}$

TL;DR

This paper investigates multiple rescattering effects in the proton-deuteron knockout reaction using the Generalized Eikonal Approximation, revealing significant modifications in reaction amplitudes crucial for understanding nuclear medium effects and color transparency.

Contribution

It introduces a refined treatment of multiple rescattering in the GEA framework, emphasizing the importance of trajectory deviations in proton knockout reactions.

Findings

Significant modification of partial amplitudes due to multiple rescattering.

Non-vanishing amplitudes with rescattering of incoming and outgoing protons.

Importance of trajectory deviations in forward spectator neutron kinematics.

Abstract

The interaction of a proton with a deuteron is the simplest nuclear reaction. However, it allows the study of precursors of nuclear medium effects such as initial-state/final-state interactions (ISI/FSI). In case of hard proton knockout, the deviation of ISI/FSI from the 'standard' values may carry a signal of color transparency. In this regard, it is important to define the 'standard' as precisely as possible. This work continues previous studies within the framework of the Generalized Eikonal Approximation (GEA). The focus is on processes where the participating protons experience multiple soft rescattering on the spectator neutron. It is shown that correct treatment of deviations of the trajectories of outgoing protons from the longitudinal direction leads to a significant modification of partial amplitudes with soft rescattering of two outgoing protons and non-vanishing amplitudes with rescattering of incoming and outgoing protons. The new treatment of multiple rescattering is important in kinematics with a forward spectator neutron.