The ABM parton distributions tuned to LHC data

By S. Alekhin, J. Bluemlein, Sven-Olaf Moch. 2013

248 citations recorded by the source corpus.

We present a global fit of parton distributions at next-to-ne xt-to-leading order (NNLO) in QCD. The fit is based on the world data for deep-inelastic scatteri ng, fixed-target data for the Drell-Yan process and includes, for the first time, data from the Large H adron Collider (LHC) for the DrellYan process and the hadro-production of top-quark pairs. The analysis applies the fixed-flavor number scheme for n f = 3, 4, 5, uses the MS scheme for the strong couplingαs and the heavyquark masses and keeps full account of the correlations among all non-perturbative parameters. At NNLO this returns the values ofαs(MZ) = 0.1132± 0.0011 and mt(pole) = 171.2± 2.4 GeV for the top-quark pole mass. The fit results are used to comput e benchmark cross sections for Higgs production at the LHC to NNLO accuracy. We compare our results to those obtained by other groups and show that differences can be linked to different theoretical descriptions of the underlying physical processes.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/344e3366030e3f1b38902b0767701a45fddbefa6

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Citations in the corpus

High precision determination of the gluon fusion Higgs boson cross-section at the LHC (2016, background): “However, the ABM12 set of parton densities yields results which are significantly lower and outside the quoted range of uncertainty.”
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.”
Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, methodology): “The LHCb vector-boson production measurements have been included within fits to data to determine PDFs [409–412].”
Measurement of forward Z → e+e− production at s=8\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s}=8 $$\end{do (2015, unknown): “NNLO/MSTW08 NNLO/CTEQ10 NNLO/NNPDF23 NNLO/NNPDF30 NNLO/ABM12 LHCb Figure 3.”
PDF4LHC recommendations for LHC Run II (2015, methodology): “ABM12 is consistent with the global fits except for MX ≥ 2 TeV when it becomes rather softer.”
The Structure of the Proton in the LHC Precision Era (2017, methodology): “The ABM12 fit [136] included hadron collider data for the first time, with a range of LHC W and Z boson measurements fit, while a comparison to top quark pair production data from the LHC and the Tevatron was also presented.”
Measurement of the forward Z boson production cross-section in pp collisions at s=7$$ \sqrt{s}=7 $$ TeV (2015, result): “The results of the analysis are compared to theoretical predictions calculated with the Fewz [30,31] generator at NNLO for the PDF sets ABM12 [32], CT10 [33], HERA1.”
A critical appraisal and evaluation of modern PDFs (2016, methodology): “a The set ABM11 fit [64] is used here, because ABM12 [2] sets are only available at NNLO”
Parton distributions from high-precision collider data (2017, methodology): “As far as perturbative evolution is concerned, APFEL has been extensively tested against other publicly available codes, such as HOPPET [109] and QCDNUM [171] for the PDF evolution and OpenQCDrad [172] for the calculation of heavy-quark structure functions in the massive scheme.”
Measurement of forward W → eν production in pp collisions at s=8$$ \sqrt{s}=8 $$ TeV (2016, methodology): “Measurements are compared to theoretical predictions calculated with the Fewz [15, 16] generator at NNLO for the six PDF sets: ABM12 [35], CT14 [36], HERA1.”
A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, methodology): “Results for such NNLO PDF sets have been obtained by ABM11 [973], ABM12 [995], CT10 [999], HERAPDF (v1.”
Measurement of W ± and Z -boson production cross sections in pp collisions at s=13 TeV with the ATLAS detector (2016, unknown): “0, MMHT14nnlo68CL, and ABM12.”
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies (2016, unknown): “[62, 63] results in quantitatively different predictions.”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, result): “The three (N)NLO ensembles of the PDF4LHC15 family (_100, _30, _MC [181]) are compared to those of ABM12 [198], CT14 [182], HERA2.”