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000604959 005__ 20250119115634.0
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000604959 0247_ $$2arXiv$$aarXiv:2404.02964
000604959 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-01287
000604959 037__ $$aPUBDB-2024-01287
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000604959 088__ $$2arXiv$$aarXiv:2404.02964
000604959 1001_ $$0P:(DE-H253)PIP1103436$$aCridge, Thomas$$b0$$eCorresponding author$$udesy
000604959 245__ $$aA first determination of the strong coupling $\alpha_S$ at approximate N$^{3}$LO order in a global PDF fit
000604959 260__ $$c2024
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000604959 520__ $$aWe present the first determination of the value of the strong coupling via a simultaneous global fit of the proton parton distribution functions (PDFs) at approximate N$^{3}$LO (aN$^{3}$LO) order in QCD. This makes use of the MSHT global PDF fitting framework, and in particular the recent theoretical advances that allow a PDF fit to now be performed at this order. The value of the strong coupling is found to be $\alpha_S(M_Z^2)$(aN$^{3}$LO)$ = 0.1170 \pm 0.0016$. This is in excellent agreement with the NNLO value of $\alpha_S(M_Z^2)$(NNLO) $= 0.1171 \pm 0.0014$, indicating that good perturbative convergence has been found. The resulting uncertainties, calculated using the MSHT dynamic tolerance procedure, are somewhat larger, but more accurate, at aN$^{3}$LO, due to the missing higher order theoretical uncertainties that are included at this order, but not at NNLO. We in addition present a detailed breakdown of the individual dataset sensitivity to the value of the strong coupling, with special focus on the impact of fitting dijet rather than inclusive jet data. This choice is found to have a non-negligible impact, but with overall good consistency found, especially at aN$^{3}$LO.
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000604959 536__ $$0G:(EU-Grant)101002090$$aCOLORFREE - High-Precision Global Analysis of Color-Free LHC Processes at Small Recoil (101002090)$$c101002090$$fERC-2020-COG$$x1
000604959 588__ $$aDataset connected to INSPIRE
000604959 650_7 $$2INSPIRE$$aparton: distribution function
000604959 650_7 $$2INSPIRE$$astrong interaction: coupling constant
000604959 650_7 $$2INSPIRE$$ahigher-order: 3
000604959 650_7 $$2INSPIRE$$adijet
000604959 650_7 $$2INSPIRE$$aquantum chromodynamics: perturbation theory
000604959 650_7 $$2INSPIRE$$asensitivity
000604959 650_7 $$2INSPIRE$$astatistical analysis
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000604959 7001_ $$0P:(DE-HGF)0$$aHarland-Lang, L. A.$$b1
000604959 7001_ $$0P:(DE-HGF)0$$aThorne, R. S.$$b2
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000604959 9141_ $$y2024
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