Pionic gluons from global QCD analysis of experimental and lattice data
William Good, Patrick C. Barry, Huey-Wen Lin, W. Melnitchouk, Alex NieMiera, Nobuo Sato
TL;DR
This paper presents the first comprehensive global QCD analysis of pion PDFs, integrating experimental data and lattice QCD results to better understand gluon distributions, especially at high momentum fractions.
Contribution
It introduces a novel combined analysis of experimental and lattice data to constrain pion gluon PDFs, reducing uncertainties and revealing new insights into gluon distributions at large x.
Findings
Higher gluon density in the pion at large x compared to the proton
Reduced uncertainties in gluon PDFs due to lattice data inclusion
Similar gluon momentum fractions in pion and proton at small x
Abstract
We perform the first global QCD analysis of parton distribution functions (PDFs) in the pion, with lattice-QCD data on gluonic pseudo--Ioffe-time distributions fitted simultaneously with experimental Drell-Yan and leading neutron electroproduction data. Inclusion of the lattice results with parametrized systematic corrections significantly reduces the uncertainties on the gluon PDF at parton momentum fractions , revealing a higher gluon density in the pion at large than in the proton. The similar gluon momentum fractions in the pion and proton further suggests a relative suppression of the pion gluon density at small .
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