2007

A practical Seedless Infrared-Safe Cone jet algorithm

Salam, Gavin P., Soyez, Gregory

Understand

Current cone jet algorithms, widely used at hadron colliders, take event particles as seeds in an iterative search for stable cones.

A longstanding infrared (IR) unsafety issue in such algorithms is often assumed to be solvable by adding extra `midpoint' seeds, but actually is just postponed to one order higher in the coupling.
A proper solution is to switch to an exact seedless cone algorithm, one that provably identifies all stable cones.
The only existing approach takes N 2^N time to find jets among N particles, making it unusable at hadron level.

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