Delineating parton distributions and the strong coupling

By P. Jimenez-Delgado, E. Reya. 2014

142 citations recorded by the source corpus.

In this study, global fits for precision determinations of parton distributions, together with the highly correlated strong coupling αs, are presented up to next-to-next-to- leading order (NNLO) of QCD utilizing most world data (charm and jet production data are used where theoretically possible), except Tevatron gauge boson production data and LHC data which are left for genuine predictions. This is done within the 'dynamical' (valencelike input at Q02 = 0.8 GeV2 ) and 'standard' (input at Q02 = 2 GeV2) approach. The stability and reliability of the results are ensured by including nonperturbative higher-twist terms, nuclear corrections as well as target mass corrections, and by applying various (Q2, W2) cuts on available data. In addition, the Q02 dependence of the results is studied in detail. Predictions are given, in particular for LHC, on gauge and Higgs boson as well as for top-quark pair production. At NNLO the dynamical approach results in αs(MZ2) = 0.1136 ± 0.0004, whereas the somewhat less constrained standard fit gives αs(MZ2) = 0.1162 ± 0.0006.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/29cd20e6b71fe0a76e156663ec8fd5f1538d5d06

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In Nuclear and High Energy Physics

Citations in the corpus

The Structure of the Proton in the LHC Precision Era (2017, background): “47 (Right) the comparison of the d/u ratios for the CJ15, MMHT14, CT14 and JR14 PDFs is shown.”
PDF4LHC recommendations for LHC Run II (2015, background): “There has also been an update of the (G)JR PDFs: JR14 [8].”
A critical appraisal and evaluation of modern PDFs (2016, methodology): “27 GeV and scale choice μR = μF = 2mc(mc) using the central PDF sets (solid lines) of ABM12 [2], CJ15 [1], CT14 [3] and JR14 [5] and the respective PDF uncertainties (dashed lines).”
Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton–proton collisions at \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepac (2017, unknown): “0 [ 80,81], and JR14 [82].”
The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II (2015, background): “Various PDF fitting collaborations provide regular updates of their QCD analysis: some of the latest PDF releases include ABM12 [14], CT14 [15], CJ12 [16], GR14 [17], HERAPDF2.”
High precision determination of the gluon fusion Higgs boson cross-section at the LHC (2016, background): “We refer to the analysis in the latest PDF4LHC working group paper [109] for a review of the updated sets ABM12 [110], CT14 [111], JR14 [112], MMHT2014 [113], NNPDF3.”