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

Jen Chieh Peng, Daniël Boer, Wen Chen Chang, Randall Evan McClellan, Oleg Teryaev

Research output: Contribution to journalArticle


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.

Original languageEnglish (US)
Pages (from-to)356-359
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Feb 10 2019



  • Drell–Yan process
  • Lam–Tung relation
  • Quarkonium production
  • Rotational invariance

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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