Pileup per particle identification

Bertolini, Daniele; Harris, Philip; Low, Matthew; Tran, Nhan

doi:10.1007/JHEP10(2014)059

Title: Pileup per particle identification

Journal Article · Thu Oct 09 00:00:00 EDT 2014 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP10(2014)059· OSTI ID:1226280

Bertolini, Daniele ^[1]; Harris, Philip ^[2]; Low, Matthew ^[3]; Tran, Nhan ^[4]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

We propose a new method for pileup mitigation by implementing “pileup per particle identification” (PUPPI). For each particle we first define a local shape α which probes the collinear versus soft diffuse structure in the neighborhood of the particle. The former is indicative of particles originating from the hard scatter and the latter of particles originating from pileup interactions. The distribution of α for charged pileup, assumed as a proxy for all pileup, is used on an event-by-event basis to calculate a weight for each particle. The weights describe the degree to which particles are pileup-like and are used to rescale their four-momenta, superseding the need for jet-based corrections. Furthermore, the algorithm flexibly allows combination with other, possibly experimental, probabilistic information associated with particles such as vertexing and timing performance. We demonstrate the algorithm improves over existing methods by looking at jet p_T and jet mass. As a result, we also find an improvement on non-jet quantities like missing transverse energy.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1226280

Report Number(s):: FERMILAB-PUB-14-238-PPD; MIT-CTP-4558; EFI-14-18; arXiv eprint number arXiv:1407.6013; TRN: US1500539

Journal Information:: Journal of High Energy Physics (Online), Vol. 2014; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 158 works

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