Constraints on parton distributions and the strong coupling from LHC jet data

Abstract

Jet production at hadron colliders provides powerful constraints on the parton distribution functions (PDFs) of the proton, in particular on the gluon PDF. Jet production can also be used to extract the QCD coupling constant and to test its running with the momentum transfer up to the TeV region. In this review, I summarize the information on PDFs and the strong coupling that has been provided by Run I LHC jet data. First of all, I discuss why jet production is directly sensitive to the gluon and quark PDFs at large-x, and then review the state-of-the-art perturbative calculations for jet production at hadron colliders and the corresponding fast calculations required for PDF fitting. Then I present the results of various recent studies on the impact on PDFs, in particular the gluon, that have been performed using as input jet measurements from ATLAS and CMS. I also review the available determinations of the strong coupling constant based on ATLAS and CMS jet data, with emphasis on the fact that LHC jet data provides, for the first time, a direct test of the ${\alpha }_s(Q)$ running at the TeV scale. I conclude with a brief outlook on possible future developments.

Article submitted to the International Journal of Modern Physics A (IJMPA) as part of the special issue on the "Jet Measurements at the LHC", editor G. Dissertori. 17 pages, 7 figures. v2: updated references, final version to be published in IJMPA

References in corpus (17)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Parton distributions for the LHC
• Measurement of the inclusive jet cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$
• Second order QCD corrections to jet production at hadron colliders: the all-gluon contribution
• The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II
• Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data
• Combination of Measurements of Inclusive Deep Inelastic $e^{\pm }p$ Scattering Cross Sections and QCD Analysis of HERA Data
• Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x
• First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations
• aMCfast: automation of fast NLO computations for PDF fits
• Measurement of the ratio of inclusive jet cross sections using the anti-kt algorithm with radius parameters R = 0.5 and 0.7 in pp collisions at sqrt(s) = 7 TeV
• Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at sqrt(s) = 7 TeV
• Quantifying the performance of jet definitions for kinematic reconstruction at the LHC
• Perturbative QCD description of jet data from LHC Run-I and Tevatron Run-II
• Constraining new coloured matter from the ratio of 3- to 2-jets cross sections at the LHC
• The Effect of LHC Jet Data on MSTW PDFs
• Constraints on color-octet fermions from a global parton distribution analysis

Cited by in corpus (2)

• The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II
• A QCD analysis of CMS inclusive differential Z production data at sqrt(s) = 8 TeV