The angular momentum of two massless fields revisited

Abstract

We consider the angular momentum of two massless fields using the Landau's arguments. In particular, we point out the explicit and implicit assumptions made by Landau to obtain the proof that a spin one system cannot decay into two photons. We show also under what conditions the result can be avoided.

16 pages, more discussions and references added

References in corpus (5)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Mirror dark matter: Cosmology, galaxy structure and direct detection
• No Landau-Yang in QCD
• On testing violations of Bose and $CPT$ symmetries via Dalitz plots and Dalitz `prism'

Cited by in corpus (4)

• Higher spin glueballs from functional methods
• A note on the fate of the Landau-Yang theorem in non-Abelian gauge theories
• Selection rules for the decay of a particle into two identical massless particles of any spin
• Fate of the Landau-Yang theorem for twisted photons