Статья

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

Richard D. BallHiggs Centre, University of Edinburgh, JCMB, KB, Mayfield Rd, Edinburgh EH9 3JZ, United KingdomJ. M. ButterworthDepartment of Physics and Astronomy, University College London, London, United KingdomA. M. Cooper-SarkarDepartment of Physics, University of Oxford, United KingdomAurore CourtoyInstituto de Fsica, Universidad Nacional Autnoma de Mxico, Apartado Postal 20-364, 01000 Ciudad de Mxico, MexicoThomas CridgeDepartment of Physics and Astronomy, University College London, London, United KingdomA. De RoeckCERN, CH-1211 Geneva, SwitzerlandJoël FeltesseIRFU, CEA, Universit Paris-Saclay, 91191 Gif-sur-Yvette, FranceStefano ForteTif Lab, Dipartimento di Fisica, Universit di Milano and INFN, Sezione di Milano, Via Celoria 16, I-20133 Milano, ItalyF. GiuliCERN, CH-1211 Geneva, SwitzerlandC. GwenlanDepartment of Physics and Astronomy, University College London, London, United KingdomL. A. Harland-LangT. J. HobbsDepartment of Physics, Illinois Institute of Technology, Chicago, IL 60616, United States of AmericaTie-Jiun HouDepartment of Physics, College of Sciences, Northeastern University, Shenyang 110819, People's Republic of ChinaJ. HustonDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 United States of AmericaR. McNultySchool of Physics, University College Dublin, Dublin 4, IrelandPavel NadolskyDepartment of Physics, Southern Methodist University, Dallas, TX 75275-0181, United States of AmericaEmanuele R. NoceraHiggs Centre, University of Edinburgh, JCMB, KB, Mayfield Rd, Edinburgh EH9 3JZ, United KingdomTanjona R. RabemananjaraDepartment of Physics and Astronomy, Vrije Universiteit, NL-1081 HV Amsterdam, The NetherlandsJuan RojoDepartment of Physics and Astronomy, Vrije Universiteit, NL-1081 HV Amsterdam, The NetherlandsR. S. ThorneDepartment of Physics and Astronomy, University College London, London, United KingdomKeping XieDepartment of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, United States of AmericaC.–P. YuanDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 United States of AmericaThe PDF4LHC Working Group

2022en

ABI

Аннотация

Abstract 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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Идентификаторы

DOI: 10.1088/1361-6471/ac7216

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Цитирований: 5Использованных источников: 0

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