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The SISCone Jet Algorithm

Version 3.0.6

Execution time

This figure shows the execution time as a function of the number of particles and compares it with other algorithms. It has been obtained on a 3.4 GHz Pentium® IV processor.

Algorithm complexity

SISCone's complexity is dominated by the search for stable cones. If N is the number of particles in the event and n the number of particles in a cone, the complexity goes like

       N n log(n)

dominated by the ordering of the O(n) points in the vicinity of each particle.

Note: for the version of SISCone with progressive-removal, the stable-sone search has to be repeated O(N/n) times, yielding a O(N2log(n)) complexity.