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Title: The importance of calorimetry for highly-boosted jet substructure

Abstract

Here, jet substructure techniques are playing an essential role in exploring the TeV scale at the Large Hadron Collider (LHC), since they facilitate the efficient reconstruction and identification of highly-boosted objects. Both for the LHC and for future colliders, there is a growing interest in using jet substructure methods based only on charged-particle information. The reason is that silicon-based tracking detectors offer excellent granularity and precise vertexing, which can improve the angular resolution on highly-collimated jets and mitigate the impact of pileup. In this paper, we assess how much jet substructure performance degrades by using track-only information, and we demonstrate physics contexts in which calorimetry is most beneficial. Specifically, we consider five different hadronic final states - W bosons, Z bosons, top quarks, light quarks, gluons - and test the pairwise discrimination power with a multi-variate combination of substructure observables. In the idealized case of perfect reconstruction, we quantify the loss in discrimination performance when using just charged particles compared to using all detected particles. We also consider the intermediate case of using charged particles plus photons, which provides valuable information about neutral pions. In the more realistic case of a segmented calorimeter, we assess the potential performance gains frommore » improving calorimeter granularity and resolution, comparing a CMS-like detector to more ambitious future detector concepts. Broadly speaking, we find large performance gains from neutral-particle information and from improved calorimetry in cases where jet mass resolution drives the discrimination power, whereas the gains are more modest if an absolute mass scale calibration is not required.« less

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [5]
  1. Brown Univ., Providence, RI (United States)
  2. Univ. of Oregon, Eugene, OR (United States)
  3. Univ. of Hamburg, Hamburg (Germany)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1416558
Report Number(s):
FERMILAB-PUB-17-347-E; MIT-CTP-4935; arXiv:1709.08705
Journal ID: ISSN 1748-0221; 1625742
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 13; Journal Issue: 01; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Coleman, Evan, Freytsis, Marat, Hinzmann, Andreas, Narain, Meenakshi, Thaler, Jesse, Tran, Nhan, and Vernieri, Caterina. The importance of calorimetry for highly-boosted jet substructure. United States: N. p., 2018. Web. doi:10.1088/1748-0221/13/01/T01003.
Coleman, Evan, Freytsis, Marat, Hinzmann, Andreas, Narain, Meenakshi, Thaler, Jesse, Tran, Nhan, & Vernieri, Caterina. The importance of calorimetry for highly-boosted jet substructure. United States. doi:10.1088/1748-0221/13/01/T01003.
Coleman, Evan, Freytsis, Marat, Hinzmann, Andreas, Narain, Meenakshi, Thaler, Jesse, Tran, Nhan, and Vernieri, Caterina. Tue . "The importance of calorimetry for highly-boosted jet substructure". United States. doi:10.1088/1748-0221/13/01/T01003.
@article{osti_1416558,
title = {The importance of calorimetry for highly-boosted jet substructure},
author = {Coleman, Evan and Freytsis, Marat and Hinzmann, Andreas and Narain, Meenakshi and Thaler, Jesse and Tran, Nhan and Vernieri, Caterina},
abstractNote = {Here, jet substructure techniques are playing an essential role in exploring the TeV scale at the Large Hadron Collider (LHC), since they facilitate the efficient reconstruction and identification of highly-boosted objects. Both for the LHC and for future colliders, there is a growing interest in using jet substructure methods based only on charged-particle information. The reason is that silicon-based tracking detectors offer excellent granularity and precise vertexing, which can improve the angular resolution on highly-collimated jets and mitigate the impact of pileup. In this paper, we assess how much jet substructure performance degrades by using track-only information, and we demonstrate physics contexts in which calorimetry is most beneficial. Specifically, we consider five different hadronic final states - W bosons, Z bosons, top quarks, light quarks, gluons - and test the pairwise discrimination power with a multi-variate combination of substructure observables. In the idealized case of perfect reconstruction, we quantify the loss in discrimination performance when using just charged particles compared to using all detected particles. We also consider the intermediate case of using charged particles plus photons, which provides valuable information about neutral pions. In the more realistic case of a segmented calorimeter, we assess the potential performance gains from improving calorimeter granularity and resolution, comparing a CMS-like detector to more ambitious future detector concepts. Broadly speaking, we find large performance gains from neutral-particle information and from improved calorimetry in cases where jet mass resolution drives the discrimination power, whereas the gains are more modest if an absolute mass scale calibration is not required.},
doi = {10.1088/1748-0221/13/01/T01003},
journal = {Journal of Instrumentation},
number = 01,
volume = 13,
place = {United States},
year = {Tue Jan 09 00:00:00 EST 2018},
month = {Tue Jan 09 00:00:00 EST 2018}
}

Journal Article:
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This content will become publicly available on January 9, 2019
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