NNLO constraints on proton PDFs from the SeaQuest and STAR experiments and other developments in the CTEQ-TEA global analysis

Guzzi, Marco; Hobbs, T. J.; Hou, Tie‐Jiun; Jing, Xiaoxian; Xie, Keping; Courtoy, Aurore; Dulat, Sayipjamal; Gao, Jun; Huston, J.; Nadolsky, Pavel; Schmidt, Carl; Sitiwaldi, Ibrahim; Yan, Mengshi; Yuan, C. -P.

doi:10.48550/arxiv.2108.06596

Cited by 4 publications

(6 citation statements)

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“…Mild inconsistency of this experiment with NMC was argued in Ref. [212]. Nevertheless, the fit quality of this dataset in the original unweighted fit is only marginally above our selection criteria, and the deterioration of the global χ 2 is also marginal.…”

Section: Appraisal and Selectionmentioning

confidence: 52%

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The path to proton structure at 1% accuracy

et al. 2022

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We present a new set of parton distribution functions (PDFs) based on a fully global dataset and machine learning techniques: NNPDF4.0. We expand the NNPDF3.1 determination with 44 new datasets, mostly from the LHC. We derive a novel methodology through hyperparameter optimization, leading to an efficient fitting algorithm built upon stochastic gradient descent. We use NNLO QCD calculations and account for NLO electroweak corrections and nuclear uncertainties. Theoretical improvements in the PDF description include a systematic implementation of positivity constraints and integrability of sum rules. We validate our methodology by means of closure tests and “future tests” (i.e. tests of backward and forward data compatibility), and assess its stability, specifically upon changes of PDF parametrization basis. We study the internal compatibility of our dataset, and investigate the dependence of results both upon the choice of input dataset and of fitting methodology. We perform a first study of the phenomenological implications of NNPDF4.0 on representative LHC processes. The software framework used to produce NNPDF4.0 is made available as an open-source package together with documentation and examples.

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Section: Appraisal and Selectionmentioning

confidence: 52%

“…7 (see Ref. [212] for a discussion of the SeaQuest data in the CT18 framework). The NNPDF4.0 strange and antistrange PDFs agree very well with MSHT20: in both these PDF sets, strangeness is enhanced in comparison to CT18.…”

Section: Comparison To Other Pdf Setsmentioning

confidence: 99%

The path to proton structure at 1% accuracy

et al. 2022

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“…This is particularly interesting for events with at least two identified final-state objects, with one at small rapidity seen by ATLAS and the other one emitting a large-rapidity neutrino seen by a properly configured FPF detector. Figure 24 shows the standard CT18 NNLO PDFs [266] that include only extrinsically produced charm, together with the alternative CT18"BHPS3" PDFs [256,281] with the large-x intrinsic sea PDFs included according to the model from Ref. [257], as well as the CT18X PDFs [266] determined with a scale choice in DIS that mimics the impact of low-x resummation.…”

Section: Fpf Forward Charm Production At Nlo With Massive Quarks and ...mentioning

confidence: 99%

The Forward Physics Facility: Sites, Experiments, and Physics Potential

Anchordoqui,

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Ariga

et al. 2021

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“…To match the accuracy and precision of experimental data, remarkable progress has been made in the calculation of theory predictions for standard candle cross sections which now include radiative corrections at next-to-next-to-leading order (NNLO) O(α 2 s ) and beyond in the QCD strong coupling α s , and at next-to-leading order (NLO) O(α EW ) in the electroweak (EW) coupling for numerous processes. At such level of precision, there are several effects whose magnitude can compete in size with that of radiative corrections at NNLO, or N 3 LO, and that have observable impacts. Examples of these effects, which we shall discuss below, are: (1) consistent inclusion of EW corrections in the initial state of parton reactions in proton-proton collisions, (2) phase-space suppression and other mass effects that are comparable in magnitude to higher-order corrections in QCD and EW.…”

mentioning

confidence: 99%

“…Examples of these effects, which we shall discuss below, are: (1) consistent inclusion of EW corrections in the initial state of parton reactions in proton-proton collisions, (2) phase-space suppression and other mass effects that are comparable in magnitude to higher-order corrections in QCD and EW. These effects have been recently investigated by the CTEQ-TEA group [1,2,3,4] after the publication of the CT18 global analysis [5] of parton distribution functions (PDFs) of the proton.…”

mentioning

confidence: 99%