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Article Dans Une Revue Journal of High Energy Physics Année : 2021

Towards high-precision parton distributions from lattice QCD via distillation

Colin Egerer
  • Fonction : Auteur
Robert G. Edwards
  • Fonction : Auteur
Christos Kallidonis
  • Fonction : Auteur
Kostas Orginos
  • Fonction : Auteur
Anatoly V. Radyushkin
  • Fonction : Auteur
David G. Richards
  • Fonction : Auteur
Eloy Romero
  • Fonction : Auteur

Résumé

We apply the Distillation spatial smearing program to the extraction of the unpolarized isovector valence PDF of the nucleon. The improved volume sampling and control of excited-states afforded by distillation leads to a dramatically improved determination of the requisite Ioffe-time Pseudo-distribution (pITD). The impact of higher-twist effects is subsequently explored by extending the Wilson line length present in our non-local operators to one half the spatial extent of the lattice ensemble considered. The valence PDF is extracted by analyzing both the matched Ioffe-time Distribution (ITD), as well as a direct matching of the pITD to the PDF. Through development of a novel prescription to obtain the PDF from the pITD, we establish a concerning deviation of the pITD from the expected DGLAP evolution of the pseudo-PDF. The presence of DGLAP evolution is observed once more following introduction of a discretization term into the PDF extractions. Observance and correction of this discrepancy further highlights the utility of distillation in such structure studies.

Dates et versions

hal-03312499 , version 1 (02-08-2021)

Identifiants

Citer

Colin Egerer, Robert G. Edwards, Christos Kallidonis, Kostas Orginos, Anatoly V. Radyushkin, et al.. Towards high-precision parton distributions from lattice QCD via distillation. Journal of High Energy Physics, 2021, 11, pp.148. ⟨10.1007/JHEP11(2021)148⟩. ⟨hal-03312499⟩
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