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No Landau-Yang in QCD

The Landau-Yang theorem, forbidding transition amplitudes between a massive spin-1 particle and two photons, is widely assumed to apply to other massless spin-1 particles. We show that this is not true in Standard-Model QCD, so that for instance antisymmetric colour-octet spin-1 quarkonia can be formed by two on-shell gluons in second-order perturbative QCD.

preprint2016arXivOpen access
W. BeenakkerR. KleissG. Lustermans
hep-ph
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W. BeenakkerR. KleissG. Lustermans

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