Extending nuclear PDF analyses into the high-
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, low-
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 region

Segarra, E.P.; Ježo, T.; Accardi, Alberto; Duwentäster, P.; Hen, O.; Hobbs, Tim; Keppel, C.; Klasen, M.; Kovařı́k, K.; Kusina, A.; Morfín, J.; Muzakka, K. F.; Olness, Fred; Schienbein, I.; Yu, Jiyoung

doi:10.1103/physrevd.103.114015

Cited by 24 publications

(13 citation statements)

References 93 publications

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“…[15] where the effects were studied in more detail -see also Ref. [16]. Only those DIS data points with the hadronic invariant mass W ≥ 1.8 GeV are included in the analysis.…”

Section: Lepton-nucleus Dismentioning

confidence: 99%

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EPPS21: A global QCD analysis of nuclear PDFs

Eskola,

Paakkinen,

Paukkunen

et al. 2021

Preprint

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We present an updated global analysis of collinearly factorized nuclear parton distribution functions (PDFs) at next-to-leading order in perturbative QCD. In comparison to our previous fit, EPPS16, the present analysis includes more data from proton-lead collisions at the Large Hadron Collider: 5 TeV doubledifferential CMS dijet and LHCb D-meson data, as well as 8 TeV CMS W ± data. These new data lead to significantly better-constrained gluon distributions at small and intermediate values of the momentum fraction x, confirming the presence of shadowing and antishadowing for gluons in large nuclei. In addition, we include Jefferson Lab measurements of deeply inelastic scattering which probe nuclear PDFs at large x and low virtualities. For the first time within the Hessian framework, we now also explore the uncertainties of nuclear PDFs due to the errors in the baseline proton PDFs. We release the results of our analysis as a new public parametrization of nuclear PDFs called EPPS21.

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“…[15] where the effects were studied in more detail -see also Ref. [16]. Only those DIS data points with the hadronic invariant mass W ≥ 1.8 GeV are included in the analysis.…”

Section: Lepton-nucleus Dismentioning

confidence: 99%

“…Fig.17The CMS 8 16. TeV Z-boson data[98,99] for nuclear modification R pPb compared with the EPPS21 fit.…”

mentioning

confidence: 99%

EPPS21: A global QCD analysis of nuclear PDFs

Eskola,

Paakkinen,

Paukkunen

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…A pioneering work [12] showed that in order to accommodate these data within current fits, it is necessary to take into account target mass corrections [13]. Following these results the high-x data and, in particular, very precise recent data measured by the CLAS Collaboration [14] are now being included in the fits of the EPPS [9] and nCTEQ [15] groups. The latter study also considers nonperturbative multi-quark interactions and a special modelling of the nuclear effects in deuterium, which they have found to be crucial for the quality of the fit.…”

Section: Improvements In the Determination Of Npdfsmentioning

confidence: 99%

Recent theoretical progress in nuclear structure

Zurita¹

2021

Proceedings of the Ninth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2021)

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Experimental evidence shows that the presence of a nuclear environment affects the outcome of observed quantities. These differences can be explained by several, sometimes orthogonal, mechanisms. A less involved phenomenological approach is to assume that the partonic behaviour at the fundamental level is changed non-trivially. Said changes are encoded into sets of nuclear densities, similar to the proton collinear ones, that have to be determined through global fits. In this article we summarise the latest results towards the determination of nuclear parton densities.

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“…One of them, in collaboration with the CJ group, touches upon the use of available data from NC DIS in the high-x region, in particular the high precision JLAB 6 GeV data, and the impact on the valence quark distributions (D=452). By relaxing the cuts on virtuality and invariant mass more data enters in this nCTEQ15-HIX fit [21], in a kinematical region where higher twists effects become relevant. In particular those considered are targetmass corrections and non-perturbative multi-quark interactions.…”

Section: Nuclear Pdfsmentioning

confidence: 99%

Structure Functions and Parton Densities: a Session Summary

Nachman¹,

Wichmann²,

Zurita³

2021

Preprint

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Studies of fragmentation and parton density functions are a core component of research in high energy particle and nuclear physics. These quantities are inherently interesting as a probe of the quantum nature of the strong force and are also essential ingredients to additional studies in high energy scattering experiments. These proceedings provide an overview of the state of the art in this area, as presented at the Deep-Inelastic Scattering Conference in the Spring of 2021.

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Extending nuclear PDF analyses into the high- x , low- Q2 region

Cited by 24 publications

References 93 publications

EPPS21: A global QCD analysis of nuclear PDFs

EPPS21: A global QCD analysis of nuclear PDFs

Recent theoretical progress in nuclear structure

Structure Functions and Parton Densities: a Session Summary

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