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We study three and four jet production in hadronic collisions atnext-to-leading order accuracy in massless QCD. We cross check resultspreviously obtained by the BlackHat collaboration for the LHC with acentre-of-mass energy of sqrt(s)=7 TeV and present new results for the LHCoperating at 8 TeV. We find large negative NLO corrections reducing theleading-order cross sections by about 40-50%. Furthermore we observe animportant reduction of the scale uncertainty. In addition to the cross sectionswe also present results for differential distributions. The dynamicalrenormalization/factorization scale used in the calculation leads to aremarkably stable K-factor. The results presented here were obtained with theNJet package, a publicly available library for the evaluation of one-loopamplitudes in massless QCD.

NLO QCD corrections to multi-jet production at the LHC with a centre-of-mass energy of sqrt(s)=8 TeV