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DOE OSTI ยท 3584420

Kaon gluon parton distribution and momentum fraction from 2+1+1 lattice QCD with high statistics

NieMiera, Alex [Michigan State University, East Lansing, MI (United States)] (ORCID:0009000705532590)ยทGood, William [Michigan State University, East Lansing, MI (United States)] (ORCID:0000000184281003)ยทLin, Huey-Wen [Michigan State University, East Lansing, MI (United States)]
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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 ๐‘Ž โ‰ˆ 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 Math output error at ๐œ‡ = 2 GeV in the Math output error 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.

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First-principles calculationsKaonsLattice QCDLattice gauge theoryParton distribution functionsQuantum chromodynamics

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NieMiera, Alex [Michigan State University, East Lansing, MI (United States)] (ORCID:0009000705532590), Good, William [Michigan State University, East Lansing, MI (United States)] (ORCID:0000000184281003), Lin, Huey-Wen [Michigan State University, East Lansing, MI (United States)]. 2025-10-14. Kaon gluon parton distribution and momentum fraction from 2+1+1 lattice QCD with high statistics. https://doi.org/10.1103/89mq-gx33

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