Medium modifications of the bound nucleon GPDs and incoherent DVCS on nuclear targets

Details Medium modifications of the bound nucleon GPDs and incoherent DVCS on nuclear targets Medium modifications of the bound nucleon GPDs and incoherent DVCS on nuclear targets

2008-06-19

arxiv.org/abs/0806.3288v3

Phys.Lett.B673:9-14,2009

Physics

Nuclear Physics

Nuclear Theory

16 pages, 6 figures. Minor editoral corrections, matches the published version in Phys. Lett. B 673 (2009) 9

Scientific paper

10.1016/j.physletb.2009.01.064

We study incoherent DVCS on $^4$He in the $^4{\rm He}(e,e^{\prime}\gamma p)X$ reaction, which probes 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 $x_B$- and $t$-dependence of the ratio of the bound to free proton asymmetries, $A_{\rm LU}^{p^{\ast}}(\phi)/A_{\rm LU}^{p}(\phi)$. We find that the deviation of $A_{\rm LU}^{p^{\ast}}(\phi)/A_{\rm LU}^{p}(\phi)$ from unity is as much as $\sim$ 6%.

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