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Title: Systematics of quark/gluon tagging

Abstract

By measuring the substructure of a jet, one can assign it a “quark” or “gluon” tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (C F versus C A). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both parton-shower generators and first-principles calculations to assess the impact of higher-order perturbative and nonperturbative physics. Working in the idealized context of electron-positron collisions, where one can define a proxy for quark and gluon jets based on the Lorentz structure of the production vertex, we find a fascinating interplay between perturbative shower effects and nonperturbative hadronization effects. Turning to proton-proton collisions, we highlight a core set of measurements that would constrain current uncertainties in quark/gluon tagging and improve the overall modeling of jets at the Large Hadron Collider.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Univ. of Paris-Saclay, Gif-sur-Yvette (France)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Univ. of Witwatersrand, Johannesburg (South Africa)
  4. Reed College, Portland, OR (United States)
  5. Lund Univ. (Sweden)
  6. Univ. of Durham (United Kingdom); Univ. of Manchester (United Kingdom)
  7. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Polish Academy of Sciences (PAS), Sopot (Poland). Inst. of Nuclear Physics
  8. Monash Univ., Clayton, VIC (Australia)
  9. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1374262
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 7; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Jets; QCD Phenomenology

Citation Formats

Gras, Philippe, Höche, Stefan, Kar, Deepak, Larkoski, Andrew, Lönnblad, Leif, Plätzer, Simon, Siódmok, Andrzej, Skands, Peter, Soyez, Gregory, and Thaler, Jesse. Systematics of quark/gluon tagging. United States: N. p., 2017. Web. doi:10.1007/JHEP07(2017)091.
Gras, Philippe, Höche, Stefan, Kar, Deepak, Larkoski, Andrew, Lönnblad, Leif, Plätzer, Simon, Siódmok, Andrzej, Skands, Peter, Soyez, Gregory, & Thaler, Jesse. Systematics of quark/gluon tagging. United States. doi:10.1007/JHEP07(2017)091.
Gras, Philippe, Höche, Stefan, Kar, Deepak, Larkoski, Andrew, Lönnblad, Leif, Plätzer, Simon, Siódmok, Andrzej, Skands, Peter, Soyez, Gregory, and Thaler, Jesse. Tue . "Systematics of quark/gluon tagging". United States. doi:10.1007/JHEP07(2017)091. https://www.osti.gov/servlets/purl/1374262.
@article{osti_1374262,
title = {Systematics of quark/gluon tagging},
author = {Gras, Philippe and Höche, Stefan and Kar, Deepak and Larkoski, Andrew and Lönnblad, Leif and Plätzer, Simon and Siódmok, Andrzej and Skands, Peter and Soyez, Gregory and Thaler, Jesse},
abstractNote = {By measuring the substructure of a jet, one can assign it a “quark” or “gluon” tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (CF versus CA). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both parton-shower generators and first-principles calculations to assess the impact of higher-order perturbative and nonperturbative physics. Working in the idealized context of electron-positron collisions, where one can define a proxy for quark and gluon jets based on the Lorentz structure of the production vertex, we find a fascinating interplay between perturbative shower effects and nonperturbative hadronization effects. Turning to proton-proton collisions, we highlight a core set of measurements that would constrain current uncertainties in quark/gluon tagging and improve the overall modeling of jets at the Large Hadron Collider.},
doi = {10.1007/JHEP07(2017)091},
journal = {Journal of High Energy Physics (Online)},
number = 7,
volume = 2017,
place = {United States},
year = {2017},
month = {7}
}

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Works referenced in this record:

String formation beyond leading colour
journal, August 2015

  • Christiansen, Jesper R.; Skands, Peter Z.
  • Journal of High Energy Physics, Vol. 2015, Issue 8
  • DOI: 10.1007/JHEP08(2015)003

A parton shower based on factorization of the quantum density matrix
journal, June 2014


Power corrections to event shapes and factorization
journal, August 1999


Matching NLO QCD computations and parton shower simulations
journal, June 2002


Hadron masses and power corrections to event shapes
journal, May 2001


Dichroic subjettiness ratios to distinguish colour flows in boosted boson tagging
journal, March 2017

  • Salam, Gavin P.; Schunk, Lais; Soyez, Gregory
  • Journal of High Energy Physics, Vol. 2017, Issue 3
  • DOI: 10.1007/JHEP03(2017)022

Calculation of power corrections to hadronic event shapes
journal, June 1995


Ariadne version 4 — A program for simulation of QDC cascades implementing the colour dipole model
journal, August 1992


Reweighting QCD matrix-element and parton-shower calculations
journal, October 2016


Unsafe but calculable: ratios of angularities in perturbative QCD
journal, September 2013

  • Larkoski, Andrew J.; Thaler, Jesse
  • Journal of High Energy Physics, Vol. 2013, Issue 9
  • DOI: 10.1007/JHEP09(2013)137

Extracting σ eff from the CDF γ + 3jets measurement
journal, March 2013

  • Bähr, M.; Myska, M.; Seymour, M. H.
  • Journal of High Energy Physics, Vol. 2013, Issue 3
  • DOI: 10.1007/JHEP03(2013)129

Deep learning in color: towards automated quark/gluon jet discrimination
journal, January 2017

  • Komiske, Patrick T.; Metodiev, Eric M.; Schwartz, Matthew D.
  • Journal of High Energy Physics, Vol. 2017, Issue 1
  • DOI: 10.1007/JHEP01(2017)110

FastJet user manual: (for version 3.0.2)
journal, March 2012


Toward multi-differential cross sections: measuring two angularities on a single jet
journal, September 2014

  • Larkoski, Andrew J.; Moult, Ian; Neill, Duff
  • Journal of High Energy Physics, Vol. 2014, Issue 9
  • DOI: 10.1007/JHEP09(2014)046

Identifying boosted objects with N-subjettiness
journal, March 2011


Infrared-safe definition of jet flavour
journal, May 2006


Dissecting Soft Radiation with Factorization
journal, March 2015


QCD Matrix Elements + Parton Showers
journal, November 2001


Event generation with SHERPA 1.1
journal, February 2009


Dipole showers and automated NLO matching in Herwig++
journal, November 2012


MCPLOTS: a particle physics resource based on volunteer computing
journal, February 2014


Quark and gluon jet substructure
journal, April 2013

  • Gallicchio, Jason; Schwartz, Matthew D.
  • Journal of High Energy Physics, Vol. 2013, Issue 4
  • DOI: 10.1007/JHEP04(2013)090

Effects of overlapping strings in pp collisions
journal, March 2015

  • Bierlich, Christian; Gustafson, Gösta; Lönnblad, Leif
  • Journal of High Energy Physics, Vol. 2015, Issue 3
  • DOI: 10.1007/JHEP03(2015)148

Using neural networks to identify jets
journal, February 1991


The midpoint between dipole and parton showers
journal, September 2015


Revisiting radiation patterns in $$e^+e^-$$ e + e - collisions
journal, April 2014


Dispelling the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>N</mml:mi><mml:mn>3</mml:mn></mml:msup></mml:math> myth for the <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msub><mml:mi>k</mml:mi><mml:mi>t</mml:mi></mml:msub></mml:math> jet-finder
journal, September 2006


Small-radius jets to all orders in QCD
journal, April 2015

  • Dasgupta, Mrinal; Dreyer, Frédéric; Salam, Gavin P.
  • Journal of High Energy Physics, Vol. 2015, Issue 4
  • DOI: 10.1007/JHEP04(2015)039

On power corrections to the event shape distributions in QCD
journal, October 2000


Maximizing boosted top identification by minimizing N-subjettiness
journal, February 2012


Measurement of electroweak production of two jets in association with a Z boson in proton–proton collisions at $$\sqrt{s}=8\,\text {TeV}$$ s = 8 TeV
journal, February 2015


Non-perturbative effects in the W and Z transverse momentum distribution
journal, October 2000


Effective predictions of event shapes: factorized, resummed and gapped angularity distributions
journal, May 2009


Energy correlation functions for jet substructure
journal, June 2013

  • Larkoski, Andrew J.; Salam, Gavin P.; Thaler, Jesse
  • Journal of High Energy Physics, Vol. 2013, Issue 6
  • DOI: 10.1007/JHEP06(2013)108

Rivet user manual
journal, December 2013

  • Buckley, Andy; Butterworth, Jonathan; Grellscheid, David
  • Computer Physics Communications, Vol. 184, Issue 12
  • DOI: 10.1016/j.cpc.2013.05.021

Jet observables without jet algorithms
journal, April 2014

  • Bertolini, Daniele; Chan, Tucker; Thaler, Jesse
  • Journal of High Energy Physics, Vol. 2014, Issue 4
  • DOI: 10.1007/JHEP04(2014)013

New angles on energy correlation functions
journal, December 2016

  • Moult, Ian; Necib, Lina; Thaler, Jesse
  • Journal of High Energy Physics, Vol. 2016, Issue 12
  • DOI: 10.1007/JHEP12(2016)153

Factorization for groomed jet substructure beyond the next-to-leading logarithm
journal, July 2016

  • Frye, Christopher; Larkoski, Andrew J.; Schwartz, Matthew D.
  • Journal of High Energy Physics, Vol. 2016, Issue 7
  • DOI: 10.1007/JHEP07(2016)064

Calculating Track-Based Observables for the LHC
journal, September 2013


Constraining MPI models using σ eff and recent Tevatron and LHC Underlying Event data
journal, October 2013


Jet Charge at the LHC
journal, May 2013


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

  • Gallicchio, Jason; Schwartz, Matthew D.
  • Journal of High Energy Physics, Vol. 2011, Issue 10
  • DOI: 10.1007/JHEP10(2011)103

Jet shapes with the broadening axis
journal, April 2014

  • Larkoski, Andrew J.; Neill, Duff; Thaler, Jesse
  • Journal of High Energy Physics, Vol. 2014, Issue 4
  • DOI: 10.1007/JHEP04(2014)017

Search for the standard model Higgs boson produced through vector boson fusion and decaying to b b ¯
journal, August 2015


Quark and Gluon Tagging at the LHC
journal, October 2011


Colour reconnections in Herwig++
journal, November 2012


Power suppressed corrections to hadronic event shapes
journal, January 1995


Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions
journal, February 1998


VINCIA for hadron colliders
journal, October 2016


Jet shapes and jet algorithms in SCET
journal, November 2010

  • Ellis, Stephen D.; Vermilion, Christopher K.; Walsh, Jonathan R.
  • Journal of High Energy Physics, Vol. 2010, Issue 11
  • DOI: 10.1007/JHEP11(2010)101

The anti- k t jet clustering algorithm
journal, April 2008


Measurement of the gluon fragmentation function and a comparison of the scaling violation in gluon and quark jets
journal, April 2000


Quark and gluon jet properties in symmetric three-jet events
journal, September 1996


Energy dependence of the differences between the quark and gluon jet fragmentation
journal, March 1996

  • Abreu et al., P.
  • Zeitschrift f�r Physik C Particles and Fields, Vol. 70, Issue 2
  • DOI: 10.1007/s002880050095

Transverse momentum moments of hadron distributions in QCD jets
journal, November 1981


Dispersive approach to power-behaved contributions in QCD hard processes
journal, June 1996


A model of non-perturbative gluon emission in an initial state parton shower
journal, June 2008


Inclusive jet spectrum for small-radius jets
journal, June 2016

  • Dasgupta, Mrinal; Dreyer, Frédéric A.; Salam, Gavin P.
  • Journal of High Energy Physics, Vol. 2016, Issue 6
  • DOI: 10.1007/JHEP06(2016)057

A study of differences between quark and gluon jets using vertex tagging of quark jets
journal, September 1993

  • Acton, P. D.; Alexander, G.; Allison, J.
  • Zeitschrift für Physik C Particles and Fields, Vol. 58, Issue 3
  • DOI: 10.1007/BF01557696

Quantum Chromodynamics Test for Jets
journal, December 1977


Merging multi-leg NLO matrix elements with parton showers
journal, March 2013


Jet trimming
journal, February 2010

  • Krohn, David; Thaler, Jesse; Wang, Lian-Tao
  • Journal of High Energy Physics, Vol. 2010, Issue 2
  • DOI: 10.1007/JHEP02(2010)084

Herwig++ physics and manual
journal, November 2008


Investigation of the splitting of quark and gluon jets
journal, June 1998


Antenna showers with one-loop matrix elements
journal, October 2013

  • Hartgring, L.; Laenen, E.; Skands, P.
  • Journal of High Energy Physics, Vol. 2013, Issue 10
  • DOI: 10.1007/JHEP10(2013)127

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

  • Larkoski, Andrew J.; Thaler, Jesse; Waalewijn, Wouter J.
  • Journal of High Energy Physics, Vol. 2014, Issue 11
  • DOI: 10.1007/JHEP11(2014)129

Quark-gluon discrimination in the search for gluino pair production at the LHC
journal, January 2017

  • Bhattacherjee, Biplob; Mukhopadhyay, Satyanarayan; Nojiri, Mihoko M.
  • Journal of High Energy Physics, Vol. 2017, Issue 1
  • DOI: 10.1007/JHEP01(2017)044

QCD coherent branching and semi-inclusive processes at large χ
journal, February 1991


A direct observation of quark-gluon jet differences at LEP
journal, August 1991


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

  • Bhattacherjee, Biplob; Mukhopadhyay, Satyanarayan; Nojiri, Mihoko M.
  • Journal of High Energy Physics, Vol. 2015, Issue 4
  • DOI: 10.1007/JHEP04(2015)131

Jet Substructure as a New Higgs-Search Channel at the Large Hadron Collider
journal, June 2008


Experimental properties of gluon and quark jets from a point source
journal, November 1999


Soft drop
journal, May 2014

  • Larkoski, Andrew J.; Marzani, Simone; Soyez, Gregory
  • Journal of High Energy Physics, Vol. 2014, Issue 5
  • DOI: 10.1007/JHEP05(2014)146

Test of QCD analytic predictions for the multiplicity ratio between gluon and quark jets
journal, November 1996


On the QCD analysis of jet broadening
journal, January 1998


Resummation of non-global QCD observables
journal, July 2001


W production in an improved parton-shower approach
journal, March 1999


Jet broadening measures in e+e− annihilation
journal, December 1992


Principles of general final-state resummation and automated implementation
journal, March 2005


Event shape–energy flow correlations
journal, July 2003


Parton-shower uncertainties with Herwig 7: benchmarks at leading order
journal, December 2016


Jet energy measurement and its systematic uncertainty in proton–proton collisions at $$\sqrt{s}=7$$ s = 7  TeV with the ATLAS detector
journal, January 2015


Resummation of double-differential cross sections and fully-unintegrated parton distribution functions
journal, February 2015

  • Procura, Massimiliano; Waalewijn, Wouter J.; Zeune, Lisa
  • Journal of High Energy Physics, Vol. 2015, Issue 2
  • DOI: 10.1007/JHEP02(2015)117

Herwig 7.0/Herwig++ 3.0 release note
journal, April 2016


An introduction to PYTHIA 8.2
journal, June 2015

  • Sjöstrand, Torbjörn; Ask, Stefan; Christiansen, Jesper R.
  • Computer Physics Communications, Vol. 191
  • DOI: 10.1016/j.cpc.2015.01.024

Jet substructure without trees
journal, June 2011

  • Jankowiak, Martin; Larkoski, Andrew J.
  • Journal of High Energy Physics, Vol. 2011, Issue 6
  • DOI: 10.1007/JHEP06(2011)057

A model independent measurement of quark and gluon jet properties and differences
journal, June 1995

  • Akers, R.; Alexander, G.; Allison, J.
  • Zeitschrift für Physik C Particles and Fields, Vol. 68, Issue 2
  • DOI: 10.1007/BF01566667

Towards an understanding of jet substructure
journal, September 2013

  • Dasgupta, Mrinal; Fregoso, Alessandro; Marzani, Simone
  • Journal of High Energy Physics, Vol. 2013, Issue 9
  • DOI: 10.1007/JHEP09(2013)029

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


QCD-aware partonic jet clustering for truth-jet flavour labelling
journal, February 2016


Better jet clustering algorithms
journal, August 1997


Inclusive and exclusive observables from dipoles in high energy collisions
journal, August 2011

  • Flensburg, Christoffer; Gustafson, Gösta; Lönnblad, Leif
  • Journal of High Energy Physics, Vol. 2011, Issue 8
  • DOI: 10.1007/JHEP08(2011)103

Weakly supervised classification in high energy physics
journal, May 2017

  • Dery, Lucio Mwinmaarong; Nachman, Benjamin; Rubbo, Francesco
  • Journal of High Energy Physics, Vol. 2017, Issue 5
  • DOI: 10.1007/JHEP05(2017)145

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