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Measured values of the WW production cross section are compared to theoretical predictions based on NNLO QCD calculations using the MSTW 2008 PDF set, published in Ref. \cite{Gehrmann:2014fva} and in Ref. \cite{HiggsXS}. Below √s=7.5 TeV only the non-resonant WW production cross section is shown, since this is what was accounted for in the measurements. The predictions are calculated with a scale choice of μrf=mWW/2. The envelope of independent scale variations by factors of 2 and 0.5 is taken as uncertainty. PDF uncertainties at 68% C.L. are calculated using MCFM at NLO from the relative PDF uncertainties of the NLO MSTW 2008 PDF set. The cross section for resonant WW production via a Higgs boson is added above √s=7.5 TeV with linearly added uncertainties. Previous measurements at the LHC by the ATLAS and CMS Collaborations at √s=7 and 8 TeV are shown as well as measurements at the proton-antiproton collider Tevatron. The CMS analysis defines only the qq→ W+1W-1 and the non-resonant gg initiated processes as signal, whilst the resonant H→ W+1W-1 process is subtracted as background. For the purpose of that plot, this contribution is added back in using the NNLO theory prediction of 4.14 pb. The CDF and D0 measurements are shown for the Tevatron collider energy of √s=1.96 TeV. The predictions for the H→ W+1W-1 cross sections and their uncertainties are interpolated linearly between √s=7/8 TeV and √s=13/14 TeV. An additional uncertainty of 0.5% on this interpolation is added in quadrature.

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Topic revision: r6 - 2016-03-08 - YushengWu
 
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