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Pileup density estimate independent on jet multiplicity.

Pileup density estimate independent on jet multiplicity.

Authors :
Berta, P.
Smieško, J.
Spousta, M.
Source :
Journal of High Energy Physics. Aug2024, Vol. 2024 Issue 8, p1-20. 20p.
Publication Year :
2024

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. There are multiple methods to remove the effect of pileup for jets. Two such methods, Area Subtraction and Constituent Subtraction, use the pileup density as the main ingredient to estimate the magnitude of pileup contribution on an event-by-event basis. The state-of-the-art approaches to estimating pileup density are sensitive to the number of hard-scatter jets in the event. This paper presents a new pileup-density estimation method that minimizes the sensitivity on the presence of hard-scatter jets in the event. Using a detector-level simulation, we provide a comparison of the new method with the state-of-the-art estimation methods. We observe a significantly lower bias for the estimated pileup density when using the new method. We conclude that the new method has the potential to significantly improve pileup mitigation in proton-proton collisions or the underlying event subtraction in heavy-ion collisions. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
11266708
Volume :
2024
Issue :
8
Database :
Academic Search Index
Journal :
Journal of High Energy Physics
Publication Type :
Academic Journal
Accession number :
181100838
Full Text :
https://doi.org/10.1007/JHEP08(2024)078