Landau-Yang theorem and decays of a Z′ boson into two Z bosons

Wai Yee Keung*, Ian Low, Jing Shu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


We study the decay of a Z′ boson into two Z bosons by extending the Landau-Yang theorem to a parent particle decaying into two Z bosons. For a spin-1 parent the theorem predicts that (1)there are only two possible couplings and (2)the normalized differential cross section depends on kinematics only through a phase shift in the azimuthal angle between the two decay planes of the Z boson. When the parent is a Z′ the two possible couplings are anomaly induced and CP violating, respectively. At the CERN Large Hadron Collider their effects could be disentangled when both Z bosons decay leptonically.

Original languageEnglish (US)
Article number091802
JournalPhysical review letters
Issue number9
StatePublished - Aug 29 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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