On the rotational invariance and non-invariance of lepton angular distributions in Drell-Yan and quarkonium production

Jen-Chieh Peng*, Daniel Boer, Wen-Chen Chang, Randall Evan McClellan, Oleg Teryaev

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

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.

Original languageEnglish
Pages (from-to)356-359
Number of pages4
JournalPhysics Letters B
Volume789
DOIs
Publication statusPublished - 10-Feb-2019

Keywords

  • Drell-Yan process
  • Quarkonium production
  • Lam Tung relation
  • Rotational invariance
  • PAIR PRODUCTION
  • POLARIZATION
  • COLLISIONS
  • PIONS
  • J/PSI

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