Lepton angular distribution of Z boson production and jet discrimination

Jen Chieh Peng, Wen Chen Chang, Randall Evan McClellan, Oleg Teryaev

Research output: Contribution to journalArticle

Abstract

High precision data of lepton angular distributions in inclusive Z boson production, reported by the CMS and ATLAS Collaborations, showed pronounced transverse momentum (qT) dependencies of the A0 and A2 coefficients. Violation of the Lam-Tung relation, A0=A2, was also found. An intuitive understanding of these results can be obtained from a geometric approach. We predict that A0 and A2 for Z plus single gluon-jet events are very different from that of Z plus single quark-jet events, allowing a new experimental tool for checking various algorithms which attempt to discriminate quark jets from gluon jets. We also predict that the Lam-Tung relation would be more severely violated for the Z plus multiple-jet data than what has been observed so far for inclusive Z production data. These predictions can be readily tested using existing LHC data.

Original languageEnglish (US)
Article number134895
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume797
DOIs
StatePublished - Oct 10 2019

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discrimination
leptons
angular distribution
bosons
quarks
transverse momentum
coefficients
predictions

Keywords

  • Jet discrimination
  • Z decay angular distribution
  • Z-boson production

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Lepton angular distribution of Z boson production and jet discrimination. / Peng, Jen Chieh; Chang, Wen Chen; McClellan, Randall Evan; Teryaev, Oleg.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 797, 134895, 10.10.2019.

Research output: Contribution to journalArticle

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