Abstract
We study incoherent DVCS on 4He in the He4(e,e′γp)X reaction, which probes possible medium-modifications of the bound nucleon GPDs and elastic form factors. Assuming that the bound nucleon GPDs are modified in proportion to the corresponding bound nucleon elastic form factors, as predicted in the quark–meson coupling model, we develop an approach to calculate various incoherent nuclear DVCS observables. As an example, we compute the beam-spin DVCS asymmetry, and predict the xB- and t-dependence of the ratio of the bound to free proton asymmetries, ALUp*(ϕ)/ALUp(ϕ). We find that the deviation of ALUp*(ϕ)/ALUp(ϕ) from unity is as much as ∼6%.
Highlights
We study incoherent Deeply Virtual Compton scattering (DVCS) on 4He in the 4He(e, e′γp)X reaction, which probes possible mediummodifications of the bound nucleon generalized parton distributions (GPDs) and elastic form factors
As indicated by measurements of unpolarized deeply inelastic scattering (DIS) of leptons off nuclear targets, unpolarized parton distributions are appreciably modified by the nuclear medium over the entire range of values of Bjorken xB [1, 2, 3, 4, 5]
The large number of approaches and models for the explanation of the EMC effect can be grouped into two large classes [3]: the models introducing non-nucleon degrees of freedom and the models assuming some kind of modifications of the nucleons themselves in the nuclear medium which mentioned earlier [14, 15, 16, 17, 18, 19, 20]
Summary
We study incoherent DVCS on 4He in the 4He(e, e′γp)X reaction, which probes possible mediummodifications of the bound nucleon GPDs and elastic form factors. In addition to the modifications of inclusive structure functions (parton distributions) and elastic form factors of the bound nucleon, the QMC model [14, 15] predicts modifications of various hadron properties in a nuclear medium [16].
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