SISCone Documentation

Version 3.0.5


The split-merge variable issue:

SISCone is intended to be a cone algorithm that is as close as possible to the Tevatron run II cone algorithm, while also being infrared (IR) safe.

Though the main IR difficulties are related to the search for stable cones, and are solved by a seedless procedure, it turns out that the split-merge phase of the algorithm is also non-trivial. The Tevatron run II split-merge procedure requires that "protojets" be considered in a sequence determined by some ordering variable. A change in the sequence can leads to a change in the final jets. When trying to find the best suited variable for the ordering of protojets in the split--merge process of SISCone, we met a couple of physical issues. Their history goes as follows:


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Contacts:  Gregory Soyez  Gavin Salam