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A method to include exclusive heavy vector-meson production data at small x in global parton analyses
C A Flett1, A D Martin2, M G Ryskin3
1Université Paris-Saclay, CNRS, IJCLab, 91405 Orsay, France.
The European Physical Journal. C, Particles and Fields
|April 21, 2025
Summary
This study introduces a new method to incorporate exclusive heavy vector-meson production data into global parton analyses. This approach refines understanding of the gluon parton distribution function (PDF) at low momentum fractions.
Area of Science:
- High Energy Physics
- Quantum Chromodynamics
- Particle Physics
Background:
- Global parton analyses are crucial for understanding the structure of hadrons.
- Exclusive heavy vector-meson production offers a unique probe of parton dynamics at low momentum fractions (x).
- Previous analyses have not fully utilized these exclusive measurements.
Purpose of the Study:
- To develop and demonstrate a method for including exclusive heavy vector-meson production data in global parton analyses.
- To determine the gluon parton distribution function (PDF) at next-to-leading order (NLO) using these data.
- To assess the impact of exclusive vector-meson production on PDF determination.
Main Methods:
- Utilizing the xFitter framework for global QCD analyses.
- Incorporating exclusive J/psi and Upsilon production data from HERA and LHC.
- Performing calculations at next-to-leading order (NLO) and discussing next-to-next-to-leading order (NNLO) effects.
Main Results:
- The proposed method successfully integrates exclusive vector-meson production data.
- The gluon PDF is constrained at moderate-to-low x, particularly in the region relevant for the LHC.
- The study quantifies the impact of these measurements on PDF uncertainties.
Conclusions:
- Exclusive heavy vector-meson production data provide valuable constraints for global parton analyses.
- The method enhances the precision of the gluon PDF determination at low x.
- Future analyses incorporating these data will improve our understanding of hadron structure.
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