From Jet Counting to Jet Vetoes
  The properties of multi-jet events impact many LHC analysis. The exclusive number of jets at hadron colliders can be described in terms of two simple patterns: staircase scaling and Poisson scaling. In photon plus jets production we can interpolate between the two patterns using simple kinematic cuts. The associated theoretical errors are well under control. Understanding such exclusive jet multiplicities significantly impacts Higgs searches and searches for supersymmetry at the LHC. 
Peter Schichtel, Christoph Englert, Erik Gerwick, Tilman Plehn,   Steffen Schumann
hep-ph