Systematics of quark/gluon tagging

Gras, Philippe; Höche, Stefan; Kar, Deepak; Larkoski, Andrew; Lönnblad, Leif; Plätzer, Simon; Siódmok, Andrzej; Skands, Peter; Soyez, Gregory; Thaler, Jesse

doi:10.1007/JHEP07(2017)091

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:

Gras, Philippe ^[1]; Höche, Stefan ^[2]; Kar, Deepak ^[3]; Larkoski, Andrew ^[4]; Lönnblad, Leif ^[5]; Plätzer, Simon ^[6]; Siódmok, Andrzej ^[7]; Skands, Peter ^[8]; Soyez, Gregory ^[9]; Thaler, Jesse ^[10]

Univ. of Paris-Saclay, Gif-sur-Yvette (France)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of Witwatersrand, Johannesburg (South Africa)
Reed College, Portland, OR (United States)
Lund Univ. (Sweden)
Univ. of Durham (United Kingdom); Univ. of Manchester (United Kingdom)
European Organization for Nuclear Research (CERN), Geneva (Switzerland); Polish Academy of Sciences (PAS), Sopot (Poland). Inst. of Nuclear Physics
Monash Univ., Clayton, VIC (Australia)
Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Publication Date:: Tue Jul 18 00:00:00 EDT 2017

Research Org.:: SLAC National Accelerator Laboratory (SLAC), 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.

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                    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.  https://doi.org/10.1007/JHEP07(2017)091

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                    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.  https://doi.org/10.1007/JHEP07(2017)091.  https://www.osti.gov/servlets/purl/1374262.

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@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         = {Tue Jul 18 00:00:00 EDT 2017},

  month        = {Tue Jul 18 00:00:00 EDT 2017}

}

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Title: Systematics of quark/gluon tagging

Abstract

Citation Formats

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Colour reconnections in Herwig++ journal, November 2012

Power suppressed corrections to hadronic event shapes journal, January 1995

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

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

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

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

Herwig++ physics and manual journal, November 2008

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

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

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

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

Studies of QCD at ${\rm e}^ + {\rm e}^-$ centre-of-mass energies between 91 and 209 GeV journal, July 2004

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

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

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

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Event shape–energy flow correlations journal, July 2003

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

String formation beyond leading colour
journal, August 2015

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

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journal, May 2001

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journal, July 2003

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journal, March 2017

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

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

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

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

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

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

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journal, April 2013

Effects of overlapping strings in pp collisions
journal, March 2015

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

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

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

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

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journal, October 2000

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

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journal, June 2013

Rivet user manual
journal, December 2013

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journal, April 2014

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journal, December 2016

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journal, July 2016

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journal, September 2013

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journal, May 2013

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journal, October 2011

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journal, April 2014

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journal, October 2011

Colour reconnections in Herwig++
journal, November 2012

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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

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journal, November 2010

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journal, April 2008

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journal, April 2000

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journal, September 1996

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

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

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journal, June 2008

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journal, June 2016

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

Herwig++ physics and manual
journal, November 2008

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

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

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

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

Studies of QCD at ${\rm e}^ + {\rm e}^-$ centre-of-mass energies between 91 and 209 GeV
journal, July 2004

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

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

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

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