Kaon gluon parton distribution and momentum fraction from 2 + 1 + 1 lattice QCD with high statistics
Year: 2025
Type: article
Abstract: We present a high-statistics lattice-QCD determination of the kaon gluon parton distribution function and gluon momentum fraction. We use clover valence fermion action to take 1,296,640 kaon-correlator measurements on a highly improved staggered quark ensemble with a ≈ 0.12 fm and 310-MeV pion mass generated by the MILC Collaboration. A detailed investigation into the impact of gauge-link smearing on the gluonic matrix elements indicates that five steps of hypercubic smearing offer an effective balance between signal quality and preservation of long-distance physics. We report a nonperturbatively renormalized kaon gluon momentum fraction of ⟨ x ⟩ g MS ¯ , K = 0.557 ( 18 ) stat ( 24 ) NPR ( 56 ) mixing at μ = 2 GeV in the MS ¯ scheme. Using reduced pseudo-Ioffe-time-distribution matrix elements and pseudo-parton-distribution-function (PDF) matching, we extract the kaon gluon PDF and compare with the prediction from the Dyson-Schwinger equation and with the pion PDF obtained from the same ensemble.
DOI: 10.1103/89mq-gx33
Authors: Alex NieMiera, William Good, Huey-Wen Lin
Institution: Michigan State University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1286236842, G1375765430, G1863003419, CAREER: Constraining Parton Distribution Functions for New-Physics Searches, G3083819904, Mapping the Structure of Hadrons with Lattice QCD, G4067968239, G419881185, G42916606, G4501827968, G498139845, G5272914373, G6671297155, G759921648, HIGH ENERGY PHYSICS COMPUTING TRAINEESHIP FOR LATTICE GAUGE THEORY, G969889393
OpenAlex ID: W4415166535