Four-Jet Production at the Large Hadron Collider at Next-to-Leading   Order in QCD
  We present the cross sections for production of up to four jets at the Large Hadron Collider, at next-to-leading order in the QCD coupling. We use the BlackHat library in conjunction with SHERPA and a recently developed algorithm for assembling primitive amplitudes into color-dressed amplitudes. We adopt the cuts used by ATLAS in their study of multi-jet events in pp collisions at \sqrt{s} = 7 TeV. We include estimates of nonperturbative corrections and compare to ATLAS data. We store intermediate results in a framework that allows the inexpensive computation of additional results for different choices of scale or parton distributions. 
Z. Bern, G. Diana, L. J. Dixon, F. Febres Cordero, S. Hoeche, D. A.   Kosower, H. Ita, D. Maitre and K. Ozeren
hep-ph hep-ex