Abstract
Abstract We present a detailed comparison of the most recent sets of NNLO PDFs from the ABM, CT, HERAPDF, MSTW and NNPDF collaborations. We compare parton distributions at low and high scales and parton luminosities relevant for LHC phenomenology. We study the PDF dependence of LHC benchmark inclusive cross sections and differential distributions for electroweak boson and jet production in the cases in which the experimental covariance matrix is available. We quantify the agreement between data and theory by computing the χ 2 for each data set with all the various PDFs. PDF comparisons are performed consistently for common values of the strong coupling. We also present a benchmark comparison of jet production at the LHC, comparing the results from various available codes and scale settings. Finally, we discuss the implications of the updated NNLO PDF sets for the combined PDF+α s uncertainty in the gluon fusion Higgs production cross section.
Highlights
We present a detailed comparison of the most recent sets of NNLO PDFs from the ABM, CT, HERAPDF, MSTW and NNPDF collaborations
In this paper we have presented an updated benchmark comparison of the most recent NNLO PDF sets from the ABM, CT, HERAPDF, MSTW and NNPDF collaborations
Our main result is that the agreement between the most recent CT, MSTW and NNPDF NNLO parton distributions is at least as good as it was at NLO, and in many cases there is a clear improvement, in that the spread of predictions from different groups is reduced significantly
Summary
We compare PDFs and parton luminosities between the various groups. Results for several other values of αs and at NLO can be obtained from the catalog of plots on the HepForge website
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