QCD effects in lepton angular distributions of Drell-Yan/Z production and jet discrimination

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

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1 Scopus citations

Abstract

We present a comparison of data of lepton angular distributions of Drell-Yan/Z production with the fixed-order pQCD calculations by which the baseline of pQCD effects is illustrated. As for the Z production, 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. Using an intuitive geometric approach, we show that the violation of the Lam-Tung relation, appearing at large transverse-momentum region, is attributed to the presence of a non-coplanarity effect. This interpretation is consistent with the appearance of violation beyond LO-QCD effect.

Original languageEnglish
Article number465
JournalProceedings of Science
Volume390
StatePublished - 15 Apr 2021
Event40th International Conference on High Energy Physics, ICHEP 2020 - Virtual, Prague, Czech Republic
Duration: 28 Jul 20206 Aug 2020

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