Quark-gluon discrimination in the search for gluino pair production at the LHC

Bhattacherjee, Biplob; Mukhopadhyay, Satyanarayan; Nojiri, Mihoko M.; Sakaki, Yasuhito; Webber, Bryan R.

doi:10.1007/JHEP01(2017)044

Title: Quark-gluon discrimination in the search for gluino pair production at the LHC

Abstract

Here, we study the impact of including quark- and gluon-initiated jet discrimination in the search for strongly interacting supersymmetric particles at the LHC. Taking the example of gluino pair production, considerable improvement is observed in the LHC search reach on including the jet substructure observables to the standard kinematic variables within a multivariate analysis. In particular, quark and gluon jet separation has higher impact in the region of intermediate mass-gap between the gluino and the lightest neutralino, as the difference between the signal and the standard model background kinematic distributions is reduced in this region. We also compare the predictions from different Monte Carlo event generators to estimate the uncertainty originating from the modelling of the parton shower and hadronization processes.

Authors:

Bhattacherjee, Biplob ^[1]; Mukhopadhyay, Satyanarayan ^[2]; Nojiri, Mihoko M. ^[3]; Sakaki, Yasuhito ^[4]; Webber, Bryan R. ^[5]

Indian Institute of Science, Bangalore (India)
Univ. of Pittsburgh, Pittsburgh, PA (United States)
The Univ. of Tokyo, Kashiwa (Japan); KEK Theory Center and Sokendai, Tsukuba (Japan)
Korea Advanced Institute of Science and Technology, Yuseong-gu (Republic of Korea)
Cavendish Lab., Cambridge (United Kingdom)

Publication Date:: Wed Jan 11 00:00:00 EST 2017

Research Org.:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1346819

Grant/Contract Number:: FG02-95ER40896

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Volume: 2017; Journal Issue: 1; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; jets; supersymmetry phenomenology

Citation Formats


                    Bhattacherjee, Biplob, Mukhopadhyay, Satyanarayan, Nojiri, Mihoko M., Sakaki, Yasuhito, and Webber, Bryan R. Quark-gluon discrimination in the search for gluino pair production at the LHC.  United States: N. p., 2017. 
        Web.  doi:10.1007/JHEP01(2017)044.

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                    Bhattacherjee, Biplob, Mukhopadhyay, Satyanarayan, Nojiri, Mihoko M., Sakaki, Yasuhito, & Webber, Bryan R. Quark-gluon discrimination in the search for gluino pair production at the LHC.  United States.  https://doi.org/10.1007/JHEP01(2017)044

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                    Bhattacherjee, Biplob, Mukhopadhyay, Satyanarayan, Nojiri, Mihoko M., Sakaki, Yasuhito, and Webber, Bryan R. 2017.  
        "Quark-gluon discrimination in the search for gluino pair production at the LHC".  United States.  https://doi.org/10.1007/JHEP01(2017)044.  https://www.osti.gov/servlets/purl/1346819.

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@article{osti_1346819,

  title        = {Quark-gluon discrimination in the search for gluino pair production at the LHC},

  author       = {Bhattacherjee, Biplob and Mukhopadhyay, Satyanarayan and Nojiri, Mihoko M. and Sakaki, Yasuhito and Webber, Bryan R.},

  abstractNote = {Here, we study the impact of including quark- and gluon-initiated jet discrimination in the search for strongly interacting supersymmetric particles at the LHC. Taking the example of gluino pair production, considerable improvement is observed in the LHC search reach on including the jet substructure observables to the standard kinematic variables within a multivariate analysis. In particular, quark and gluon jet separation has higher impact in the region of intermediate mass-gap between the gluino and the lightest neutralino, as the difference between the signal and the standard model background kinematic distributions is reduced in this region. We also compare the predictions from different Monte Carlo event generators to estimate the uncertainty originating from the modelling of the parton shower and hadronization processes.},

  doi          = {10.1007/JHEP01(2017)044},

  url          = {https://www.osti.gov/biblio/1346819},
  journal      = {Journal of High Energy Physics (Online)},

  issn         = {1029-8479},

  number       = 1,

  volume       = 2017,

  place        = {United States},

  year         = {Wed Jan 11 00:00:00 EST 2017},

  month        = {Wed Jan 11 00:00:00 EST 2017}

}

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Works referencing / citing this record:

Weakly Supervised Classification in High Energy Physics
text, January 2017

Dery, Lucio Mwinmaarong; Nachman, Benjamin; Rubbo, Francesco
arXiv
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Casimir Meets Poisson: Improved Quark/Gluon Discrimination with Counting Observables
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Frye, Christopher; Larkoski, Andrew J.; Thaler, Jesse
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Spectral Analysis of Jet Substructure with Neural Networks: Boosted Higgs Case
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Lim, Sung Hak; Nojiri, Mihoko M.
arXiv
https://doi.org/10.48550/arxiv.1807.03312

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Title: Quark-gluon discrimination in the search for gluino pair production at the LHC

Abstract

Citation Formats

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Limits and confidence intervals in the presence of nuisance parameters journal, October 2005

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations text, January 2014

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Herwig++ Physics and Manual text, January 2008

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New Generation of Parton Distributions with Uncertainties from Global QCD Analysis text, January 2002

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Weakly Supervised Classification in High Energy Physics text, January 2017

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Spectral Analysis of Jet Substructure with Neural Networks: Boosted Higgs Case text, January 2018

Pure samples of quark and gluon jets at the LHC
journal, October 2011

Multivariate discrimination and the Higgs+W/Z search
journal, April 2011

Energy correlation functions for jet substructure
journal, June 2013

Associated jet and subjet rates in light-quark and gluon jet discrimination
journal, April 2015

Gaining (mutual) information about quark/gluon discrimination
journal, November 2014

Evolution variable dependence of jet substructure
journal, August 2015

New angles on energy correlation functions
journal, December 2016

Light-quark and gluon jet discrimination in $$pp$$ p p collisions at $$\sqrt{s}=7\mathrm {\ TeV}$$ s = 7 TeV with the ATLAS detector
journal, August 2014

PYTHIA 6.4 physics and manual
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A brief introduction to PYTHIA 8.1
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An introduction to PYTHIA 8.2
journal, June 2015

Herwig++ physics and manual
journal, November 2008

Measurement of the charged-particle multiplicity inside jets from $$\sqrt{s}=8$$ s = 8 $${\mathrm{TeV}}$$ TeV pp collisions with the ATLAS detector
journal, June 2016

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
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New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
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FastJet user manual: (for version 3.0.2)
journal, March 2012

The anti- k _t jet clustering algorithm
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The toolkit for multivariate data analysis, TMVA 4
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Limits and confidence intervals in the presence of nuisance parameters
journal, October 2005

The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
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Quark and Gluon Tagging at the LHC
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Energy Correlation Functions for Jet Substructure
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Associated jet and subjet rates in light-quark and gluon jet discrimination
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Factorization for groomed jet substructure beyond the next-to-leading logarithm
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New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
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Dispelling the N^3 myth for the Kt jet-finder
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Jet Substructure Studies with CMS Open Data
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