Nuclear response in electromagnetic interactions with complex nuclei

Azimuthal asymmetries in unpolarized Drell–Yan events on nuclear targets

“…for proton momenta p > ∼ 1 GeV/c, it has been shown [31,32,33] that this method gives the same FSI effects as the usual approach based on the Distorted Wave Impulse Approximation (DWIA), where the projectile wave function is expanded in partial waves and a Schrödinger equation is solved for each partial wave L with a complex optical potential up to a L max depending on the projectile energy and satisfying a stringent convergency criterion (for a review, see Ref. [34]). Actually, it was directly checked that the equivalence of these methods holds when the Glauber scattering wave is replaced by an eikonal wave function [35].…”

“…The coefficient α(p) is largely energy dependent [34]. For sake of simplicity (and noting that the overall spin-orbit effect is not an increasing function of p at large energies [34]), we rewrite the asymmetric factor as α(p) p ≡ η(p). Since ηR ≪ 1 at large energies, we may approximate 1 ± ηx ≈ exp(±ηx) and write the components of the projectile wave function as…”

Measurement of the neutron (³He) spin structure functions at low Q²: A connection between the Bjorken and gerasimov-drell-hearn sum rule

“…The spin-averaged inclusive inelastic cross section can be expressed in terms of two invariant structure functions as follows [133][134][135]:…”

Final-state interaction and recoil polarization in reactions: comparison with the polarized target case

“…In recent years the study of recoil polarization observables in (e, e ′ p) and ( e, e ′ p) reactions has attracted attention both from the experimental [1,2] and theoretical [3,4,5,6,7,8,9,10,11,12] points of view. In particular, many of the latest studies have been focused on the polarization transfer asymmetry in reactions initiated by polarized electrons [13,14,15,16].…”

“…In particular, many of the latest studies have been focused on the polarization transfer asymmetry in reactions initiated by polarized electrons [13,14,15,16]. For these significant effort is being expended in investigations of light nuclei, with much of the focus being placed on the analysis of the polarization transfer in the 4 He( e, e ′ p) 3 H reaction which has recently been measured at MAMI [17,18]. One of the goals of such studies is to obtain information from the measured polarization transfer ratios about medium modifications of the proton form factor.…”