期刊
PHYSICS LETTERS B
卷 789, 期 -, 页码 356-359出版社
ELSEVIER
DOI: 10.1016/j.physletb.2018.11.061
关键词
Drell-Yan process; Quarkonium production; Lam Tung relation; Rotational invariance
资金
- U.S. National Science Foundation
- Ministry of Science and Technology of Taiwan
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-060R23177]
Several rotational invariant quantities for the lepton angular distributions in Drell-Yan and quarkonium production were derived several years ago, allowing the comparison between different experiments adopting different reference frames. Using an intuitive picture for describing the lepton angular distribution in these processes, we show how the rotational invariance of these quantities can be obtained. This approach can also be used to determine the rotational invariance or non-invariance of various quantities specifying the amount of violation for the Lam-Tung relation. While the violation of the Lam-Tung relation is often expressed by frame-dependent quantities, we note that alternative frame-independent quantities are preferred. (C) 2018 The Authors. Published by Elsevier B.V.
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