Helicity Asymmetry for Proton Emission from Polarized Electrons in the Eikonal Regime

Abstract

The nuclear response to longitudinally polarized electrons, detected in coincidence with out-of-plane high-energy protons, is discussed in a simple model where the ejectile wave function is approximated as a plane wave with a complex wave vector. This choice is equivalent to solve the problem of Final-State Interactions (FSI) in homogeneous nuclear matter, as the residual nucleus can be described to a first approximation when dealing with very fast emitted protons. The main advantage of the present method is that in the framework of the Distorted-Wave Impulse Approximation (DWIA) it allows for an analytical derivation of all the components of the nuclear response. It emerges that cancellations among the leading contributions determine the very small absolute size of the socalled fifth structure function and produce a nontrivial asymptotic scaling of the related helicity asymmetry for large values of the momentum transfer.

22 pages, RevTeX, 5 postscript figures encoded in separate file, submitted to Phys. Rev. C

References in corpus (4)

• The Geometrical Color Optics Of Coherent High Energy Processes
• A Test of the Eikonal Approximation in High-Energy (e,e'p) Scattering
• Angular Distributions for Knockout and Scattering of Protons in the Eikonal Approximation
• Quantum interference effects in ($\vec{e},e^{\prime }p$) reactions

Cited by in corpus (7)

• Self-consistent Green's function method for nuclei and nuclear matter
• Two-hadron interference fragmentation functions. Part I: general framework
• Two-hadron interference fragmentation functions. Part II: a model calculation
• Consistency of spectroscopic factors from (e,e'p) reactions at different momentum transfers
• Electron helicity-dependence in (e,e'p) reactions with polarized nuclei and the fifth response function
• T-odd distributions, breaking of long range correlations, and sudden entropy changes, in Drell-Yan high-energy processes
• Azimuthal asymmetries in unpolarized Drell-Yan events on nuclear targets