Partonic Structure of Light Nuclei

Abstract

We propose to study the partonic structure of ${}^4$He by measuring the Beam Spin Asymmetry (BSA) in coherent Deeply Virtual Compton Scattering (DVCS) and the differential cross-section of the Deeply Virtual Meson Production (DVMP) of the $\varphi$. Despite its simple structure, a light nucleus such as ${}^4$He has a density and a binding energy comparable to that of heavier nuclei. Therefore, by studying ${}^4$He nucleus, one can learn typical features of the partonic structure of atomic nuclei. The combination of CLAS12 and the ALERT detector provides a unique opportunity to study both the quark and gluon structure of a dense light nucleus. Coherent exclusive DVCS off ${}^4$He will probe the transverse spatial distribution of quarks in the nucleus as a function of the quarks' longitudinal momentum fraction, $x$. In parallel, the average spatial transverse gluon density of the ${}^4$He nucleus will be extracted within a GPD framework using the measured longitudinal cross-section for coherent $\varphi$ production in a similar range of $x$. Additionally, threshold effects of $\varphi$ production can be explored by exploiting the ALERT detector's large acceptance for low $|t|$ events.

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Cited by in corpus (5)

• An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
• Nucleon axial form factor from generalized parton distributions
• Deeply virtual Compton scattering off Helium nuclei with positron beams
• Nucleon Femtography from Exclusive Reactions
• Deeply virtual Compton Scattering off ${}^4$He