2019
DOI: 10.1103/physrevd.100.114024
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Updating and optimizing error parton distribution function sets in the Hessian approach. II.

Abstract: In an earlier publication, we introduced the software package, ePump (error PDF Updating Method Package), that can be used to update or optimize a set of parton distribution functions (PDFs), including the best-fit PDF set and Hessian eigenvector pairs of PDF sets (i.e., error PDFs), and to update any other set of observables, in the Hessian approach. Here, we validate the ePump program with a detailed comparison against a full global analysis, and we demonstrate the potential of ePump by presenting selected p… Show more

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Cited by 36 publications
(44 citation statements)
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“…45 GeV, plotted as a function of x for CT14 NNLO PDFs. Right: the same, for correlations with PDFs of individual flavors ies [9,11,15,16,20] find that deep-inelastic scattering experiments on nuclear targets will continue to provide strong constraints on the down-quark PDFs in the nucleon in the near future. In a global QCD analysis, experimental measurements made solely on proton targets are at present insufficient for full separation of parton distributions for d, s, g, and anti-quark flavors.…”
Section: Introductionmentioning
confidence: 94%
“…45 GeV, plotted as a function of x for CT14 NNLO PDFs. Right: the same, for correlations with PDFs of individual flavors ies [9,11,15,16,20] find that deep-inelastic scattering experiments on nuclear targets will continue to provide strong constraints on the down-quark PDFs in the nucleon in the near future. In a global QCD analysis, experimental measurements made solely on proton targets are at present insufficient for full separation of parton distributions for d, s, g, and anti-quark flavors.…”
Section: Introductionmentioning
confidence: 94%
“…In these figures, the light blue band represents the original uncertainty of the DSSV14 global data fit [51]. The red (green) dashed band is the uncertainty from a next-to-leading order fit using ePump [52,53] by adding DSSV14 fit with EicC DIS (SIDIS) pseudodata with integrated luminosity of 50 fb −1 for both electron-proton (3.5 GeV + 20 GeV) and electron- 3 He collisions (3.5 GeV + 40 GeV). One can tell that the SIDIS data, taking advantage of π ± and K ± final states from both proton and effective neutron targets, is more powerful comparing to DIS data in the flavor separations.…”
Section: One-dimensional Spin Structure Of Nucleonsmentioning
confidence: 99%
“…To overcome this possible limitation, it is also possible to estimate the impact of new data directly using the so-called "Hessian profiling" [16,17,43,44] method to update the existing Hessian PDF sets. The advantage of this Hessian updating method over the Monte Carlo reweighting method is that it directly works with the (smaller set of) Hessian PDFs, and it is a simpler and a much faster way to estimate the effects of the new data.…”
Section: Jhep08(2021)034 4 Description Of the Impact Study Using Epumpmentioning
confidence: 99%
“…In this work, the software package ePump (error PDF Updating Method Package) [16,17], which can update any given set of Hessian PDFs obtained from an earlier global analysis, was used. Although the DSSV14 PDFs were presented as Monte Carlo sets, we can apply the package MC2Hessian [45] to produce an equivalent Hessian set, which will be named as DSSV14H in this work.…”
Section: Jhep08(2021)034 4 Description Of the Impact Study Using Epumpmentioning
confidence: 99%
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