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 language||English (US)|
|Journal||Proceedings of Science|
|State||Published - Apr 15 2021|
|Event||40th International Conference on High Energy Physics, ICHEP 2020 - Virtual, Prague, Czech Republic|
Duration: Jul 28 2020 → Aug 6 2020
ASJC Scopus subject areas