Confronting lattice parton distributions with global QCD analysis

Bringewatt, Jacob; Sato, Nobuo; Melnitchouk, Wally; Qiu, Jian‐Wei; Steffens, Fernanda; Constantinou, Martha

doi:10.1103/physrevd.103.016003

Cited by 53 publications

(32 citation statements)

References 53 publications

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“…The quality of data, however, hints that a future calculation of a distribution less constrained by experiment may benefit from the use of distillation. By validating the distillation method in the unpolarized nucleon PDF, our study opens new avenues of synergy between lattice and phenomenology in the spirit of [11,99,100]. We performed a careful study of the correct extraction of the matrix elements that yield the pseudo-ITD and we analyzed in detail its real and imaginary components.…”

Section: Discussionmentioning

confidence: 99%

Towards high-precision parton distributions from lattice QCD via distillation

Egerer

Edwards

Kallidonis

et al. 2021

J. High Energ. Phys.

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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.

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Section: Discussionmentioning

confidence: 99%

Towards high-precision parton distributions from lattice QCD via distillation

Egerer

Edwards

Kallidonis

et al. 2021

J. High Energ. Phys.

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“…Studies exploring the synergy of lattice QCD results and global analysis can be found in Refs. [8][9][10]. In the right panel of Fig.…”

Section: Pdfsmentioning

confidence: 95%

“…[5] and experimental data sets within the JAM framework, performed in Ref. [9]. The effect of the lattice data in the unpolarized PDFs does not further constrain the PDFs.…”

Section: Pdfsmentioning

confidence: 99%

Light-cone PDFs and GPDs from Lattice QCD

Constantinou¹

2021

Preprint

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“…[40] for ETMC and Ref. [41] for HadStruc) and JAM (only for ETMC [42]) global fitting frameworks. We only briefly summarize the main findings.…”

Section: Case Study: Twist-2 Pdfsmentioning

confidence: 99%

Overview of lattice calculations of the x-dependence of PDFs, GPDs and TMDs

Cichy

2022

EPJ Web Conf.

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For a long time, lattice QCD was unable to address the x-dependence of partonic distributions, direct access to which is impossible in Euclidean spacetime. Recent years have brought a breakthrough for such calculations when it was realized that partonic light-cone correlations can be accessed through spatial correlations computable on the lattice. Appropriately devised observables can be factorized into physical PDFs via a perturbative procedure called matching, analogous to the standard factorization of experimental cross sections. In this short review, aimed at a broader high-energy and nuclear physics community, we discuss the recent highlights of this research program. Key concepts are outlined, followed by a case study illustrating the typical stage of current lattice extractions and by a brief review of the most recent explorations. We finalize with a number of messages for the prospects of lattice determinations of partonic structure.

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Confronting lattice parton distributions with global QCD analysis

Cited by 53 publications

References 53 publications

Towards high-precision parton distributions from lattice QCD via distillation

Towards high-precision parton distributions from lattice QCD via distillation

Light-cone PDFs and GPDs from Lattice QCD

Overview of lattice calculations of the x-dependence of PDFs, GPDs and TMDs

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