PDFs from protons to nuclei

Accardi, Alberto

doi:10.22323/1.247.0001

Cited by 7 publications

(11 citation statements)

References 40 publications

(53 reference statements)

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“…Extracting parton-level information from nuclear data sets involving the deuteron or heavier targets requires an understanding of the effects of the nuclear environment [8,14]. The trivial dependence on the nuclear atomic number A and charge Z is normally implemented by constructing a nuclear PDF as a linear combination of the PDFs on free protons and neutrons, as reviewed, e.g., in Sec.…”

Section: The Role Of Nuclear-medium Effectsmentioning

confidence: 99%

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

et al. 2021

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Experimental measurements in deep-inelastic scattering and lepton-pair production on deuterium targets play an important role in the flavor separation of u and d (anti)quarks in global QCD analyses of the parton distribution functions (PDFs) of the nucleon. We investigate the impact of theoretical corrections accounting for the light-nuclear structure of the deuteron upon the fitted u, d-quark, gluon, and other PDFs in the CJ15 and CT18 families of next-to-leading order CTEQ global analyses. The investigation is done using the $$L_2$$ L 2 sensitivity statistical method, which provides a common metric to quantify the strength of experimental constraints on various PDFs and ratios of PDFs in the two distinct fitting frameworks. Using the $$L_2$$ L 2 sensitivity and other approaches, we examine the compatibility of deuteron data sets with other fitted experiments under varied implementations of the deuteron corrections. We find that freely-fitted deuteron corrections modify the PDF uncertainty at large momentum fractions and will be relevant for future PDFs affecting electroweak precision measurements.

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Section: The Role Of Nuclear-medium Effectsmentioning

confidence: 99%

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

et al. 2021

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“…The theoretical uncertainty inherent in this nuclear correction procedure should be added to the statistical PDF uncertainties. Nonetheless, the reduction of the uncertainties due to the increased number of fitted data points is even greater, leading to an overall smaller d-quark PDF uncertainty than in fits performed without deuterium data [30,191,192]. Furthermore, as shown in [1], and discussed in more detail below, it is possible to significantly reduce the nuclear correction uncertainty by exploiting the interplay of the deuteron DIS data and the recent high-statistics DØ data on the reconstructed W ± boson charge asymmetry at large rapidity, which is equally sensitive to the d/u ratio but is not affected by nuclear corrections.…”

Section: Up-and Down-quark Distributionsmentioning

confidence: 99%

“…Nuclear effects in neutrino DIS and possible differences between those in charged-lepton DIS have been discussed recently in Refs. [192,194,195], for instance. Supplementary information on the strange sea at small x, independent of nuclear effects, can be obtained from the associated production of charm quarks and W bosons in the pp collisions at the LHC.…”

Section: Strange-quark Distributionmentioning

confidence: 99%

“…The extrapolation of nuclear effects from the deuteron to heavy nuclei is unclear, especially in view of the differences between the off-shell quark deformation fitted using deuteron targets [1] and using the ratio of heavy nuclei to deuteron structure functions [205]. As mentioned in the previous section, in general care should also be exercised when using neutrino-nucleus scattering data to obtain, for example, constraints on strange-quark PDFs, due to the currently poor understanding of the interaction dynamics of the final state heavy quark propagating through the target nucleus [192].…”

Section: Nuclear Correctionsmentioning

confidence: 99%

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A critical appraisal and evaluation of modern PDFs

et al. 2016

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We review the present status of the determination of parton distribution functions (PDFs) in the light of the precision requirements for the LHC in Run 2 and other future hadron colliders. We provide brief reviews of all currently available PDF sets and use them to compute cross sections for a number of benchmark processes, including Higgs boson production in gluon-gluon fusion at the LHC. We show that the differences in the predictions obtained with the various PDFs are due to particular theory assumptions made in the fits of those PDFs. We discuss PDF uncertainties in the kinematic region covered by the LHC and on averaging procedures for PDFs, such as advocated by the PDF4LHC15 sets, and provide recommendations for the usage of PDF sets for theory predictions at the LHC.

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“…Furthermore, tensions between nuclear target data and proton measurements at the LHC have been highlighted and discussed in Refs. [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Gauge invariance and kaon production in deep inelastic scattering at low scales

Guerrero

Accardi

2018

Phys. Rev. D

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This paper focuses on hadron mass effects in calculations of semi-inclusive kaon production in leptonDeuteron deeply inelastic scattering at HERMES and COMPASS kinematics. In the collinear factorization framework, the corresponding cross section is shown to factorize, at leading order and leading twist, into products of parton distributions and fragmentation functions evaluated in terms of kaon-and nucleon-mass-dependent scaling variables, and to respect gauge invariance. It is found that hadron mass corrections for integrated kaon multiplicities sizeably reduce the apparent large discrepancy between measurements of K þ þ K − multiplicities performed by the two collaborations, and fully reconcile their K þ =K − ratios.

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PDFs from protons to nuclei

Cited by 7 publications

References 40 publications

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

A critical appraisal and evaluation of modern PDFs

Gauge invariance and kaon production in deep inelastic scattering at low scales

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