Transverse single-spin asymmetries in $γ$SIDIS as a direct probe of quark-gluon-quark longitudinal momentum structure
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| Format: | Preprint |
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2025
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| _version_ | 1866914000252436480 |
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| author | Harris, Michael Marsh, Jacob Pitonyak, Daniel Prokudin, Alexei Putnam, Jack Rein, Daniel Schlegel, Marc |
| author_facet | Harris, Michael Marsh, Jacob Pitonyak, Daniel Prokudin, Alexei Putnam, Jack Rein, Daniel Schlegel, Marc |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_02711 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Transverse single-spin asymmetries in $γ$SIDIS as a direct probe of quark-gluon-quark longitudinal momentum structure Harris, Michael Marsh, Jacob Pitonyak, Daniel Prokudin, Alexei Putnam, Jack Rein, Daniel Schlegel, Marc High Energy Physics - Phenomenology High Energy Physics - Experiment 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. |
| title | Transverse single-spin asymmetries in $γ$SIDIS as a direct probe of quark-gluon-quark longitudinal momentum structure |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2505.02711 |