Accessing the Gluon Momentum Fraction of Nucleons through the Gradient Flow
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912906404167680 |
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| author | Edwards, Robert Karpie, Joe Maio, Lorenzo Monahan, Christopher J. Orginos, Kostas Richards, David Sturzu, Alexandru M. Zafeiropoulos, Savvas |
| author_facet | Edwards, Robert Karpie, Joe Maio, Lorenzo Monahan, Christopher J. Orginos, Kostas Richards, David Sturzu, Alexandru M. Zafeiropoulos, Savvas |
| contents | We calculate the gluon momentum fraction of the nucleon using lattice quantum chromodynamics (QCD), with a nonperturbative renormalization technique based on the gradient flow. The gluon momentum fraction is determined on a single Wilson-clover ensemble using Nf = 2+1 flavors with pion mass 358 MeV and lattice spacing 0.094 fm. We employ the variational method to reduce excited-state contamination and apply the distillation framework to ensure a large operator basis. To reduce systematic uncertainties, we apply Bayesian model averaging to all fit procedures. We apply matching coefficients to the flow-time dependent lattice results to recover the gluon momentum fraction in the MS-scheme at 2 GeV. Our final result is <x>_g(μ= 2 GeV) = 0.482(35), where we quote only statistical uncertainties. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_14260 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Accessing the Gluon Momentum Fraction of Nucleons through the Gradient Flow Edwards, Robert Karpie, Joe Maio, Lorenzo Monahan, Christopher J. Orginos, Kostas Richards, David Sturzu, Alexandru M. Zafeiropoulos, Savvas High Energy Physics - Lattice High Energy Physics - Phenomenology We calculate the gluon momentum fraction of the nucleon using lattice quantum chromodynamics (QCD), with a nonperturbative renormalization technique based on the gradient flow. The gluon momentum fraction is determined on a single Wilson-clover ensemble using Nf = 2+1 flavors with pion mass 358 MeV and lattice spacing 0.094 fm. We employ the variational method to reduce excited-state contamination and apply the distillation framework to ensure a large operator basis. To reduce systematic uncertainties, we apply Bayesian model averaging to all fit procedures. We apply matching coefficients to the flow-time dependent lattice results to recover the gluon momentum fraction in the MS-scheme at 2 GeV. Our final result is <x>_g(μ= 2 GeV) = 0.482(35), where we quote only statistical uncertainties. |
| title | Accessing the Gluon Momentum Fraction of Nucleons through the Gradient Flow |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.14260 |