Update of Parton Distributions at NNLO

By Alan D. Martin, W. Stirling, R. Thorne, Graeme Watt. 2007

193 citations recorded by the source corpus.

Abstract We present a new set of parton distributions obtained at NNLO. These differ from the previous sets available at NNLO due to improvements in the theoretical treatment. In particular we include a full treatment of heavy flavours in the region near the quark mass. In this way, an essentially complete set of NNLO partons is presented for the first time. The improved treatment leads to a significant change in the gluon and heavy quark distributions, and a larger value of the QCD coupling at NNLO, α S ( M Z 2 ) = 0.1191 ± 0.002 ( expt . ) ± 0.003 ( theory ) . Indirectly this also leads to a change in the light partons at small x and modifications of our predictions for W and Z production at the LHC. As well as the best-fit set of partons, we also provide 30 additional sets representing the uncertainties of the partons obtained using the Hessian approach.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/92023bddb0546ed659711bb7fbd1df5c8f36eb88

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In Nuclear and High Energy Physics

Citations in the corpus

Mixed QCD-electroweak corrections to Higgs boson production in gluon fusion (2008, methodology): “We combine our results with the best current estimates for contributions from top and bottom quarks to derive an updated theoretical prediction for the Higgs boson production cross section in gluon fusion.”
The Structure of the Proton in the LHC Precision Era (2017, background): “A proper treatment of the PDF discontinuities which occur at NNLO across heavy flavour thresholds was presented later in [473].”