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No Landau-Yang in QCD

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arxiv 1508.07115 v3 pith:HIBJJRQJ submitted 2015-08-28 hep-ph

W. Beenakker , R. Kleiss , G. Lustermans This is my paper · ORCID
classification hep-ph
keywords spin-1landau-yangamplitudesantisymmetricapplyassumedcolour-octetforbidding
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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.

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  1. Two-loop form factors for $P$-wave quarkonium production and decay

    hep-ph 2025-01 conditional novelty 8.0 of 10

    Analytic two-loop form factors for chi_{Q,J} production and decay are presented, including a new NRQCD singularity that couples P-wave states to the 3S1[8] configuration.

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