Assertion: photon's momentum | /r/CapableOf | contribute to given helicity combination
Facets:
Source sentences:
text: Following Ref.  let us define reduced amplitudes ~M by splitting off the leading angular dependence in terms of the d-functions dJ0 where J0=1,2 denotes the lowest angular momentum contributing to a given helicity combination, M ( σ , λ , ¯ λ ; θ ) =