QCD effects in lepton angular distributions of Drell-Yan/$Z$ production and jet discrimination
| Autor: | Chang, Wen-Chen, McClellan, Randall Evan, Peng, Jen-Chieh, Teryaev, Oleg |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.22323/1.390.0465 |
| Popis: | 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 $A_0$ 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. 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. Comment: 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 |
| Databáze: | arXiv |
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