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.
@article{arxiv.2101.11160,
title = {QCD effects in lepton angular distributions of Drell-Yan/$Z$ production and jet discrimination},
author = {Wen-Chen Chang and Randall Evan McClellan and Jen-Chieh Peng and Oleg Teryaev},
journal= {arXiv preprint arXiv:2101.11160},
year = {2022}
}
Comments
7 pages, 2 figures; contribution to the proceedings of 40th International Conference on High Energy physics (ICHEP2020), 28 July - 6 August 2020, Prague, Czech. arXiv admin note: text overlap with arXiv:1907.11356