Four-jet production in kt-factorization: single and double parton   scattering
  We present a preliminary study of both Single and Double Parton Scattering contributions to the inclusive 4-jet production in the kt-factorization framework at Leading Order and $E_{CM} = 7$ TeV. We compare our results to collinear results in the literature and to the ATLAS and CMS data at 8 and 7 TeV respectively. We also discuss the importance of double parton scattering for relatively soft cuts on the jet transverse momenta and find out that symmetric cuts do not quite suit well to kt-factorization predictions, because of a kinematic effect suppressing the double parton scattering contribution. 
Mirko Serino
hep-ph