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The Continuum and Leading Twist Limits of Parton Distribution Functions in Lattice QCD

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arxiv 2105.13313 v3 pith:JC7BXYTI submitted 2021-05-27 hep-lat hep-ph

The Continuum and Leading Twist Limits of Parton Distribution Functions in Lattice QCD

classification hep-lat hep-ph
keywords latticecontinuumdistributionerrorssystematictwistleadinglimit
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this study, we present continuum limit results for the unpolarized parton distribution function of the nucleon computed in lattice QCD. This study is the first continuum limit using the pseudo-PDF approach with Short Distance Factorization for factorizing lattice QCD calculable matrix elements. Our findings are also compared with the pertinent phenomenological determinations. Inter alia, we are employing the summation Generalized Eigenvalue Problem (sGEVP) technique in order to optimize our control over the excited state contamination which can be one of the most serious systematic errors in this type of calculations. A crucial novel ingredient of our analysis is the parameterization of systematic errors using Jacobi polynomials to characterize and remove both lattice spacing and higher twist contaminations, as well as the leading twist distribution. This method can be expanded in further studies to remove all other systematic errors.

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  1. Parton distribution functions from lattice QCD

    hep-lat 2026-07 unverdicted

    A review of lattice-QCD approaches to parton distribution functions concludes that the field is moving from feasibility studies to quantitatively controlled calculations.