Transverse single-spin asymmetries in $γ$SIDIS as a direct probe of quark-gluon-quark longitudinal momentum structure
Year: 2025
Type: preprint
Abstract: Transverse single-spin asymmetries in the semi-inclusive deep-inelastic production of isolated photons ($γ$SIDIS), $A_{UT}^{γ{\rm SIDIS}}$, provide an unprecedented opportunity to extract the quark-gluon-quark correlators $F_{FT}(x,x')$ and $G_{FT}(x,x')$ point-by-point in their full support $x,x'$. We utilize realistic models for these functions, based on input from the Sivers transverse momentum dependent parton distribution function and imposing constraints from the $d_2$ matrix element calculated in lattice QCD, in order to provide numerical estimates for $A_{UT}^{γ{\rm SIDIS}}$ at the Electron-Ion Collider (EIC). We thoroughly explore the EIC phase space in order to isolate in which regions the asymmetry can be sizable, finding it can be as much as $10\%$ or larger for certain kinematics. Given that $F_{FT}(x,x')$ and $G_{FT}(x,x')$ are basically unknown, $A_{UT}^{γ{\rm SIDIS}}$ will be an important future measurement to learn about multi-parton correlations in the nucleon.
Source: arXiv (Cornell University)
Authors: Harris, Michael, Marsh, Jacob, Pitonyak, Daniel, Prokudin, Alexei, Putnam, Jack, Rein, Daniel, Schlegel, Marc
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1728142190, G2263355576, G2702141073, G2988778103, RUI: Hadronic Structure from Spin Observables in pQCD, FOR 2926: Next Generation Perturbative QCD for Hadron Structure:
Preparing for the ElectronIon Collider, G6084215942, G7520763071, G7603157382, RUI: The 3D Momentum and Spin Structure of the Nucleon in QCD
OpenAlex ID: W6979283363
Cites:
Cited by:
Related to: