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Title: A novel in situ trigger combination method

Abstract

Searches for rare physics processes using particle detectors in high-luminosity colliding hadronic beam environments require the use of multi-level trigger systems to reject colossal background rates in real time. In analyses like the search for the Higgs boson, there is a need to maximize the signal acceptance by combining multiple different trigger chains when forming the offline data sample. In such statistically limited searches, datasets are often amassed over periods of several years, during which the trigger characteristics evolve and system performance can vary significantly. Reliable production cross-section measurements and upper limits must take into account a detailed understanding of the effective trigger inefficiency for every selected candidate event. We present as an example the complex situation of three trigger chains, based on missing energy and jet energy, that were combined in the context of the search for the Higgs (H) boson produced in association with a $$W$$ boson at the Collider Detector at Fermilab (CDF). We briefly review the existing techniques for combining triggers, namely the inclusion, division, and exclusion methods. We introduce and describe a novel fourth in situ method whereby, for each candidate event, only the trigger chain with the highest a priori probability of selecting the event is considered. We compare the inclusion and novel in situ methods for signal event yields in the CDF $WH$ search. This new combination method, by virtue of its scalability to large numbers of differing trigger chains and insensitivity to correlations between triggers, will benefit future long-running collider experiments, including those currently operating on the Large Hadron Collider.

Authors:
 [1];  [1];  [2];  [3]
+ Show Author Affiliations
  1. McGill Univ., Montreal, QC (Canada)
  2. Baylor Univ., Waco, TX (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1044225
Report Number(s):
FERMILAB-PUB-12-296-E; arXiv:1206.4813
Journal ID: ISSN 0168-9002; 1119060
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 711; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Buzatu, Adrian, Warburton, Andreas, Krumnack, Nils, and Yao, Wei-Ming. A novel in situ trigger combination method. United States: N. p., 2013. Web. doi:10.1016/j.nima.2013.01.034.
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Buzatu, Adrian, Warburton, Andreas, Krumnack, Nils, & Yao, Wei-Ming. A novel in situ trigger combination method. United States. https://doi.org/10.1016/j.nima.2013.01.034
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Buzatu, Adrian, Warburton, Andreas, Krumnack, Nils, and Yao, Wei-Ming. Wed . "A novel in situ trigger combination method". United States. https://doi.org/10.1016/j.nima.2013.01.034. https://www.osti.gov/servlets/purl/1044225.
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@article{osti_1044225,
title = {A novel in situ trigger combination method},
author = {Buzatu, Adrian and Warburton, Andreas and Krumnack, Nils and Yao, Wei-Ming},
abstractNote = {Searches for rare physics processes using particle detectors in high-luminosity colliding hadronic beam environments require the use of multi-level trigger systems to reject colossal background rates in real time. In analyses like the search for the Higgs boson, there is a need to maximize the signal acceptance by combining multiple different trigger chains when forming the offline data sample. In such statistically limited searches, datasets are often amassed over periods of several years, during which the trigger characteristics evolve and system performance can vary significantly. Reliable production cross-section measurements and upper limits must take into account a detailed understanding of the effective trigger inefficiency for every selected candidate event. We present as an example the complex situation of three trigger chains, based on missing energy and jet energy, that were combined in the context of the search for the Higgs (H) boson produced in association with a $W$ boson at the Collider Detector at Fermilab (CDF). We briefly review the existing techniques for combining triggers, namely the inclusion, division, and exclusion methods. We introduce and describe a novel fourth in situ method whereby, for each candidate event, only the trigger chain with the highest a priori probability of selecting the event is considered. We compare the inclusion and novel in situ methods for signal event yields in the CDF $WH$ search. This new combination method, by virtue of its scalability to large numbers of differing trigger chains and insensitivity to correlations between triggers, will benefit future long-running collider experiments, including those currently operating on the Large Hadron Collider.},
doi = {10.1016/j.nima.2013.01.034},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 711,
place = {United States},
year = {2013},
month = {1}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.nima.2013.01.034
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Works referenced in this record:

Measurement of the J / ψ meson and b -hadron production cross sections in p p ¯ collisions at s = 1960     G e V
journal, February 2005

Combining Triggers in HEP data analysis
journal, June 2009

  • Lendermann, Victor; Haller, Johannes; Herbst, Michael
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 604, Issue 3
  • DOI: 10.1016/j.nima.2009.03.173

Introduction to HOBIT, a b-jet identification tagger at the CDF experiment optimized for light Higgs boson searches
journal, January 2013

  • Freeman, J.; Junk, T.; Kirby, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 697
  • DOI: 10.1016/j.nima.2012.09.021

Search for the standard model Higgs boson produced in association with a W ± boson with 7.5     fb − 1 integrated luminosity at CDF
journal, August 2012

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