QCD Jet Rates with the Inclusive Generalized kt Algorithms
  We derive generating functions, valid to next-to-double logarithmic accuracy, for QCD jet rates according to the inclusive forms of the kt, Cambridge/Aachen and anti-kt algorithms, which are equivalent at this level of accuracy. We compare the analytical results with jet rates and average jet multiplicities from the SHERPA event generator, and study the transition between Poisson-like and staircase-like behaviour of jet ratios. 
Erik Gerwick, Ben Gripaios, Steffen Schumann, Bryan Webber
hep-ph