6533b7defe1ef96bd1276956
RESEARCH PRODUCT
Pileup and underlying event mitigation with iterative constituent subtraction
Lucia MasettiD. W. MillerP. BertaM. Spoustasubject
Nuclear and High Energy PhysicsParticle physicsSubtraction methodFOS: Physical sciences01 natural sciencesMinimum biasHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Hadron-Hadron scattering (experiments)0103 physical sciencesJetslcsh:Nuclear and particle physics. Atomic energy. RadioactivityHardware_ARITHMETICANDLOGICSTRUCTURES010306 general physicsNuclear ExperimentEvent (probability theory)PhysicsBackground subtractionHard scattering010308 nuclear & particles physicsSubtractionObservableHigh Energy Physics - Phenomenologylcsh:QC770-798AlgorithmJet substructureEnergy (signal processing)Underlying eventFree parameterdescription
Abstract The hard-scatter processes in hadronic collisions are often largely contaminated with soft background coming from pileup in proton-proton collisions, or underlying event in heavy-ion collisions. This paper presents a new background subtraction method for jets and event observables (such as missing transverse energy) which is based on the previously published Constituent Subtraction algorithm. The new subtraction method, called Iterative Constituent Subtraction, applies event-wide implementation of Constituent Subtraction iteratively in order to fully equilibrate the background subtraction across the entire event. Besides documenting the new method, we provide guidelines for setting the free parameters of the subtraction algorithm. Using particle-level simulation, we provide a comparison of Iterative Constituent Subtraction with several existing methods from which we conclude that the new method has a significant potential to improve the background mitigation in both proton-proton and heavy-ion collisions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-11-23 | Journal of High Energy Physics |