Toward Precision Helicity PDFs from Global DIS and SIDIS Fits with Projected EIC Measurements
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arXiv
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| Natura: | Preprint |
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2026
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| author | Khanpour, Hamzeh Soleymaninia, Maryam Azizi, Majid Klasen, Michael Hashamipour, Hadi Salajegheh, Maral Meißner, Ulf-G. |
| author_facet | Khanpour, Hamzeh Soleymaninia, Maryam Azizi, Majid Klasen, Michael Hashamipour, Hadi Salajegheh, Maral Meißner, Ulf-G. |
| contents | We present a new global determination of the helicity-dependent parton distribution functions (PDFs) of the proton, based on inclusive deep-inelastic scattering (DIS) and semi-inclusive DIS (SIDIS) data within a consistent next-to-leading order (NLO) QCD framework. In addition to existing measurements, we incorporate simulated pseudodata for the future Electron-Ion Collider (EIC), considering two beam-energy configurations, $E_e \times E_p = 5 \times 41~\mathrm{GeV^2}$ and $18 \times 275~\mathrm{GeV^2}$, corresponding to an extended kinematic reach down to $x \sim 10^{-5}$. We focus on longitudinal double-spin asymmetries $A_1^h$ for charge-separated pion and kaon production in SIDIS off a longitudinally polarized proton target. These projected measurements significantly improve the flavor separation of sea-quark polarized PDFs ($Δ\bar{u}$, $Δ\bar{d}$, $Δs$) and reduce the uncertainties on both quark and gluon helicity distributions, with the largest impact at small $x$. Polarized PDFs are extracted using a neural-network parametrization and a Monte Carlo replica methodology to propagate experimental uncertainties, while theoretical constraints such as positivity are imposed during the fit. We demonstrate that the inclusion of EIC pseudodata leads to a substantially more precise determination of polarized PDFs, with the largest impact in the small-$x$ region. The resulting polarized PDF sets are provided in the {\tt LHAPDF} format. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_17298 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Toward Precision Helicity PDFs from Global DIS and SIDIS Fits with Projected EIC Measurements Khanpour, Hamzeh Soleymaninia, Maryam Azizi, Majid Klasen, Michael Hashamipour, Hadi Salajegheh, Maral Meißner, Ulf-G. High Energy Physics - Phenomenology High Energy Physics - Experiment We present a new global determination of the helicity-dependent parton distribution functions (PDFs) of the proton, based on inclusive deep-inelastic scattering (DIS) and semi-inclusive DIS (SIDIS) data within a consistent next-to-leading order (NLO) QCD framework. In addition to existing measurements, we incorporate simulated pseudodata for the future Electron-Ion Collider (EIC), considering two beam-energy configurations, $E_e \times E_p = 5 \times 41~\mathrm{GeV^2}$ and $18 \times 275~\mathrm{GeV^2}$, corresponding to an extended kinematic reach down to $x \sim 10^{-5}$. We focus on longitudinal double-spin asymmetries $A_1^h$ for charge-separated pion and kaon production in SIDIS off a longitudinally polarized proton target. These projected measurements significantly improve the flavor separation of sea-quark polarized PDFs ($Δ\bar{u}$, $Δ\bar{d}$, $Δs$) and reduce the uncertainties on both quark and gluon helicity distributions, with the largest impact at small $x$. Polarized PDFs are extracted using a neural-network parametrization and a Monte Carlo replica methodology to propagate experimental uncertainties, while theoretical constraints such as positivity are imposed during the fit. We demonstrate that the inclusion of EIC pseudodata leads to a substantially more precise determination of polarized PDFs, with the largest impact in the small-$x$ region. The resulting polarized PDF sets are provided in the {\tt LHAPDF} format. |
| title | Toward Precision Helicity PDFs from Global DIS and SIDIS Fits with Projected EIC Measurements |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2602.17298 |