Abstract
Existing widely used pileup removal approaches correct the momenta of individual jets. In this article we introduce an event-level, particle-based pileup correction procedure, SoftKiller. It removes the softest particles in an event, up to a transverse momentum threshold that is determined dynamically on an event-by-event basis. In simulations, this simple procedure appears to be reasonably robust and brings superior jet resolution performance compared to existing jet-based approaches. It is also nearly two orders of magnitude faster than methods based on jet areas.
Highlights
At high-luminosity hadron colliders such as CERN’s Large Hadron Collider (LHC), an issue that has an impact on many analyses is pileup, the superposition of multiple proton– proton collisions at each bunch crossing
The SoftKiller method appears to bring significant improvements in pileup mitigation performance, in particular as concerns the jet energy resolution, whose degradation due to pileup is reduced by 20−30 % relative to the area–medianbased methods
The performance that is obtained with area–median subtraction for 70 pileup events can be extended to 140 pileup events when using SoftKiller
Summary
At high-luminosity hadron colliders such as CERN’s Large Hadron Collider (LHC), an issue that has an impact on many analyses is pileup, the superposition of multiple proton– proton collisions at each bunch crossing. 5 If one keeps the underlying event in the hard event, much of it (about 1 GeV for both the area–median approach and the SoftKiller) is subtracted together with the pileup correction, affecting slightly the observed shifts.
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