Lepton angular distribution of Z boson production and jet discrimination

Jen-Chieh Peng; Wen-Chen Chang; Randall Evan McClellan; Oleg Teryaev

doi:10.1016/j.physletb.2019.134895

paper

Lepton angular distribution of Z boson production and jet discrimination

arXiv:1907.10483 · doi:10.1016/j.physletb.2019.134895

Abstract

High precision data of lepton angular distributions in inclusive $Z$ boson production, reported by the CMS and ATLAS Collaborations, showed pronounced transverse momentum ( $q_{T}$ ) dependencies of the $A_{0}$ and $A_{2}$ coefficients. Violation of the Lam-Tung relation, $A_{0} = A_{2}$ , was also found. An intuitive understanding of these results can be obtained from a geometric approach. We predict that $A_{0}$ and $A_{2}$ 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.

arXiv comment5 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1708.05807

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Lepton angular distribution of $W$ boson productions