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Jet grooming is an important strategy for analyzing relativistic particlecollisions in the presence of contaminating radiation. Most jet groomingtechniques introduce hard cutoffs to remove soft radiation, leading todiscontinuous behavior and associated experimental and theoretical challenges.In this paper, we introduce Pileup and Infrared Radiation Annihilation(PIRANHA), a paradigm for continuous jet grooming that overcomes thediscontinuity and infrared sensitivity of hard-cutoff grooming procedures. Wemotivate PIRANHA from the perspective of optimal transport and the EnergyMover's Distance and review Apollonius Subtraction and Iterated VoronoiSubtraction as examples of PIRANHA-style grooming. We then introduce a newtree-based implementation of PIRANHA, Recursive Subtraction, with reducedcomputational costs. Finally, we demonstrate the performance of RecursiveSubtraction in mitigating sensitivity to soft distortions from hadronizationand detector effects, and additive contamination from pileup and the underlyingevent.

Pileup and Infrared Radiation Annihilation (PIRANHA): A Paradigm for Continuous Jet Grooming