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

Ball, Richard D.; Butterworth, Jon; Cooper-Sarkar, Amanda M.; Courtoy, Aurore; Cridge, Thomas; De Roeck, Albert; Feltesse, Joel; Forte, Stefano; Giuli, Francesco; Gwenlan, Claire; Harland-Lang, Lucian A.; Hobbs, T. J.; Hou, Tie-Jiun; Huston, Joey; McNulty, Ronan; Nadolsky, Pavel M.; Nocera, Emanuele R.; Rabemananjara, Tanjona R.; Rojo, Juan; Thorne, Robert S.; Xie, Keping; Yuan, C-P; The PDF4LHC Working Group,

doi:10.1088/1361-6471/ac7216

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

Journal Article · Tue Jul 05 00:00:00 EDT 2022 · Journal of Physics. G, Nuclear and Particle Physics

DOI:https://doi.org/10.1088/1361-6471/ac7216· OSTI ID:1861818

Ball, Richard D. ^[1]; Butterworth, Jon; Cooper-Sarkar, Amanda M.;

;

; Feltesse, Joel; Forte, Stefano;

; Gwenlan, Claire; Harland-Lang, Lucian A.;

; Hou, Tie-Jiun; Huston, Joey; McNulty, Ronan;

;

; Rabemananjara, Tanjona R.;

; Thorne, Robert S. more »

Univ. of Edinburgh, Scotland (United Kingdom); PDF4LHC Working Group. et al.

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.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: PDF4LHC Working Group

Grant/Contract Number:: AC02-07CH11359; SC0010129; SC0007914

OSTI ID:: 1861818

Report Number(s):: FERMILAB-PUB-22-121-QIS-SCD-T; MSUHEP-22-010, Nikhef 2021-033; SMU-HEP-22-01; arXiv:2203.05506; oai:inspirehep.net:2049642; TRN: US2305492

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Vol. 49, Issue 8; ISSN 0954-3899

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Measurement of the differential cross section and charge asymmetry for inclusive $$\mathrm {p}\mathrm {p}\rightarrow \mathrm {W}^{\pm }+X$$ p p → W ± + X production at $${\sqrt{s}} = 8$$ s = 8 TeV Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A. The European Physical Journal C, Vol. 76, Issue 8 https://doi.org/10.1140/epjc/s10052-016-4293-4	journal	August 2016
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Measurement of the shape of the boson rapidity distribution for $p \bar{p} \to Z / γ^{*} \to e^{+} e^{-} + X$ events produced at $\sqrt{s}$ of 1.96 TeV Abazov, V. M.; Abbott, B.; Abolins, M. Physical Review D, Vol. 76, Issue 1 https://doi.org/10.1103/PhysRevD.76.012003	journal	July 2007
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Measurement of <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>d</mml:mi><mml:mi>σ</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>d</mml:mi><mml:mi>y</mml:mi></mml:math> of Drell–Yan <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> pairs in the Z mass region from <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> collisions at <mml:math altimg="si4.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> Aaltonen, T.; Adelman, J.; Álvarez González, B. Physics Letters B, Vol. 692, Issue 4 https://doi.org/10.1016/j.physletb.2010.06.043	journal	September 2010
Differential top quark pair production at the LHC: Challenges for PDF fits Bailey, S.; Harland-Lang, L. A. The European Physical Journal C, Vol. 80, Issue 1 https://doi.org/10.1140/epjc/s10052-020-7633-3	journal	January 2020
Charm in deep-inelastic scattering Ball, Richard D.; Bonvini, Marco; Rottoli, Luca Journal of High Energy Physics, Vol. 2015, Issue 11 https://doi.org/10.1007/jhep11(2015)122	journal	November 2015

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