The Effect of LHC Jet Data on MSTW PDFs

Abstract

We consider the effect on LHC jet cross sections on partons distribution functions (PDFs), in particular the MSTW2008 set of PDFs. We first compare the published inclusive jet data to the predictions using MSTW2008, finding a very good description. We also use the parton distribution reweighting procedure to estimate the impact of these new data on the PDFs, finding that the combined ATLAS 2.76 TeV and 7 TeV data, and CMS 7 TeV data have some significant impact. We then also investigate the impact of ATLAS, CMS and D0 dijet data using the same techniques. In this case we investigate the effect of using different scale choices for the NLO cross section calculation. We find that the dijet data is generally not completely compatible with the corresponding inclusive jet data, often tending to pull PDFs, particularly the gluon distribution, away from the default values. However, the effect depends on the dijet data set used as well as the scale choice. We also note that conclusions may be affected by limiting the pull on the data luminosity chosen by the best fit, which is sometimes a number of standard deviations. Finally we include the inclusive jet data in a new PDF fit explicitly. This enables us to check the consistency of the exact result with that obtained from the reweighting procedure. There is generally good, but not full quantitative agreement. Hence, the conclusion remains that MSTW2008 PDFs already fit the published jet data well, but the central values and uncertainties are altered and improved respectively by significant, but not dramatic extent by inclusion of these data.

63 pages, 50 figures. Final version. Some added discussion and improved figures

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Cited by in corpus (18)

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• The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II
• PDF reweighting in the Hessian matrix approach
• aMCfast: automation of fast NLO computations for PDF fits
• 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
• Jet Angularities in Z+jet production at the LHC
• Phenomenology of jet angularities at the LHC
• Measurement of the triple-differential dijet cross section in proton-proton collisions at sqrt(s) = 8 TeV and constraints on parton distribution functions
• The effect on PDFs and ${\alpha }_S(M_Z^2)$ due to changes in flavour scheme and higher twist contributions
• Unveiling saturation effects from nuclear structure function measurements at the EIC
• Heavy Flavour Jet Substructure
• Constraints on parton distributions and the strong coupling from LHC jet data
• Heavy Flavor Jet Substructure at Lepton Colliders
• Updates of PDFs in the MSTW framework
• A QCD analysis of CMS inclusive differential Z production data at sqrt(s) = 8 TeV
• Jet substructure of light and heavy flavor jets at RHIC