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Quark/Gluon Discrimination

  • Simone Marzani
  • Gregory Soyez
  • Michael Spannowsky
Chapter
  • 343 Downloads
Part of the Lecture Notes in Physics book series (LNP, volume 958)

Abstract

This chapter is dedicated to the specific applications of substructure techniques to discriminate quark-initiated jets from gluon-initiated jets. We begin with a brief discussion on how to tentatively define quark- and gluon-initiated jets. We then concentrate on two broad classes of observables: (i) shape observables like angularities or energy-correlation functions, and (ii) multiplicity-based observables like the iterated soft-drop multiplicity. In each case, we provide a basic analytic understanding of the tools based on the resummation techniques introduced in Chap. 4. We then discuss the key properties of the tools and assess their performance on Monte-Carlo simulations, highlighting the features which are reproduced by the simple analytic calculations.

References

  1. 50.
    A.J. Larkoski, S. Marzani, G. Soyez, J. Thaler, Soft drop. J. High Energy Phys. 1405, 146 (2014). [1402.2657]Google Scholar
  2. 135.
    J. Gallicchio, M.D. Schwartz, Quark and Gluon jet substructure. J. High Energy Phys. 04, 090 (2013). [1211.7038]Google Scholar
  3. 136.
    J.R. Andersen et al., Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report, in 9th Les Houches Workshop on Physics at TeV Colliders (PhysTeV 2015), Les Houches, June 1–19, 2015 (2016). 1605.04692ADSGoogle Scholar
  4. 143.
    A.J. Larkoski, G.P. Salam, J. Thaler, Energy correlation functions for jet substructure. J. High Energy Phys. 1306, 108 (2013). [1305.0007]Google Scholar
  5. 148.
    C. Frye, A.J. Larkoski, J. Thaler, K. Zhou, Casimir meets Poisson: improved quark/gluon discrimination with counting observables. J. High Energy Phys. 09, 083 (2017). [1704.06266]Google Scholar
  6. 181.
    P. Gras, S. Hoeche, D. Kar, A. Larkoski, L. Lönnblad, S. Platzer et al., Systematics of quark/gluon tagging. J. High Energy Phys. 07, 091 (2017). [1704.03878]Google Scholar
  7. 182.
    S. Bright-Thonney, B. Nachman, Investigating the topology dependence of quark and gluon jets. 1810.05653Google Scholar
  8. 183.
    Z. Nagy, Next-to-leading order calculation of three-jet observables in hadron-hadron collisions. Phys. Rev. D68, 094002 (2003). [hep-ph/0307268]Google Scholar
  9. 184.
    J.M. Campbell, R.K. Ellis, Update on vector boson pair production at hadron colliders. Phys. Rev. D60, 113006 (1999). [hep-ph/9905386]Google Scholar
  10. 186.
    J.M. Campbell, R.K. Ellis, W.T. Giele, A multi-threaded version of MCFM. Eur. Phys. J. C75, 246 (2015). [1503.06182]Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Simone Marzani
    • 1
  • Gregory Soyez
    • 2
  • Michael Spannowsky
    • 3
  1. 1.Dipartimento di FisicaUniversità di GenovaGenovaItaly
  2. 2.Institut de Physique TheoriqueCNRS UMR 3681, CEA SaclayGif-sur-Yvette cedexFrance
  3. 3.Department of Physics, Institute for Particle Physics PhenomenologyDurham UniversityDurhamUK

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