Speaker
Description
In recent years, significant efforts have been devoted to characterize signatures of Double Parton Scattering (DPS) in hadronic collisions, the simplest process within the set of multiple parton scatterings. Notably, it has been found that DPS plays a crucial role in the studies of Standard Model processes and beyond, when high accuracy is required. The DPS cross-section depends on new unknown double parton distributions which encod novel crucial information on the parotnic structure of hadrons.
Within the Light-Front approach, we formally derive the two contributions to the nuclear DPD [1]: DPS1, involving two partons from the same nucleon, and DPS2, where the two partons belong to different parent nucleons. Our aim is to explore whether, and to what extent, nuclear DPS could provide novel insights into the partonic structure of nuclei in the valence region. To this end, we calculate nuclear DPDs for $^2H$, and the DPS1 contribution to the DPDs for $^3He$, and $^4He$ by retaining only the valence component of the nuclear Fock state. These calculations utilize realistic wave functions, embedded in a rigorous Poincaré-covariant formalism.
Furthermore, we introduce and investigate novel observables involving nuclear DPDs, which we call double-EMC ratios, acting as the two-body counterpart to conventional EMC ratios [2]. Importantly, we demonstrate that different existing models used to describe nucleon structure, which give substantially equivalent results for the standard EMC effect, have a largely different impact on these double-EMC ratios. Therefore, these novel ratios could shed crucial light on the partonic structure of bound nucleons, providing a deeper interpretation of the EMC effect.
[1] "Theoretical insights on nuclear double parton distributions", F.A.Ceccopieri, F.Fornetti, E.Pace, M.Rinaldi, G.Salmè, and N.Iles...(metti referenza
[2] "Double parton scattering off nuclei and double EMC effect", F.Fornetti, E.Pace, M.Rinaldi, G.Salmè, and N.Iles , in prepration.