The PDF4LHC21 combination of global PDF fits for the LHC Run III

Autor: Richard D Ball, Jon Butterworth, Amanda M Cooper-Sarkar, Aurore Courtoy, Thomas Cridge, Albert De Roeck, Joel Feltesse, Stefano Forte, Francesco Giuli, Claire Gwenlan, Lucian A Harland-Lang, T J Hobbs, Tie-Jiun Hou, Joey Huston, Ronan McNulty, Pavel M Nadolsky, Emanuele R Nocera, Tanjona R Rabemananjara, Juan Rojo, Robert S Thorne, Keping Xie, C-P Yuan, null The PDF4LHC Working Group
Přispěvatelé: (Astro)-Particles Physics, Group, PDF4LHC Working, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, PDF4LHC Working Group
Rok vydání: 2022
Předmět:
Nuclear and High Energy Physics
interpretation of experiments: CERN LHC Coll
parton distribution functions
large hadron collider
parton: distribution function
FOS: Physical sciences
Settore FIS/04 - Fisica Nucleare e Subnucleare
High Energy Physics - Experiment
quark
High Energy Physics - Experiment (hep-ex)
benchmark
High Energy Physics - Phenomenology (hep-ph)
gauge boson: production
quantum chromodynamics
structure
SDG 7 - Affordable and Clean Energy
particle physics
Monte Carlo
Particle Physics - Phenomenology
lepton hadron
electroweak interaction
High Energy Physics::Phenomenology
hep-ph
Settore FIS/02 - Fisica Teorica
Modelli e Metodi Matematici
High Energy Physics - Phenomenology
hadron hadron
Higgs particle: production
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
differential cross section
gluon: fusion
Particle Physics - Experiment
Zdroj: Journal of Physics G: Nuclear and Particle Physics, 49(8):080501, 1-95. IOP Publishing Ltd.
The Pdf4lhc Working Group 2022, ' The PDF4LHC21 combination of global PDF fits for the LHC Run III ', Journal of Physics G: Nuclear and Particle Physics, vol. 49, no. 8, 080501, pp. 1-95 . https://doi.org/10.1088/1361-6471/ac7216
J.Phys.G
J.Phys.G, 2022, 49 (8), pp.080501. ⟨10.1088/1361-6471/ac7216⟩
ISSN: 0954-3899
DOI: 10.48550/arxiv.2203.05506
Popis: A precise knowledge of the quark and gluon structure of the proton, encoded by the parton distribution functions (PDFs), is of paramount importance for the interpretation of high-energy processes at present and future lepton-hadron and hadron-hadron colliders. Motivated by recent progress in the PDF determinations carried out by the CT, MSHT, and NNPDF groups, we present an updated combination of global PDF fits: PDF4LHC21. It is based on the Monte Carlo combination of the CT18, MSHT20, and NNPDF3.1 sets followed by either its Hessian reduction or its replica compression. Extensive benchmark studies are carried out in order to disentangle the origin of the differences between the three global PDF sets. In particular, dedicated fits based on almost identical theory settings and input datasets are performed by the three groups, highlighting the role played by the respective fitting methodologies. We compare the new PDF4LHC21 combination with its predecessor, PDF4LHC15, demonstrating their good overall consistency and a modest reduction of PDF uncertainties for key LHC processes such as electroweak gauge boson production and Higgs boson production in gluon fusion. We study the phenomenological implications of PDF4LHC21 for a representative selection of inclusive, fiducial, and differential cross sections at the LHC. The PDF4LHC21 combination is made available via the LHAPDF library and provides a robust, user-friendly, and efficient method to estimate the PDF uncertainties associated to theoretical calculations for the upcoming Run III of the LHC and beyond.
Comment: 87 pages, 44 figures, 11 tables
Databáze: OpenAIRE
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