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A note on the fate of the Landau-Yang theorem in non-Abelian gauge theories

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arxiv 1509.07853 v2 pith:FMJUMH7T submitted 2015-09-25 hep-ph hep-th

Matteo Cacciari , Luigi Del Debbio , José R. Espinosa , Antonio D. Polosa , Massimo Testa This is my paper · ORCID
classification hep-phhep-th
keywords invariancenon-abelianamplitudearguebosebrstcolor-octetconsiderations
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Using elementary considerations of Lorentz invariance, Bose symmetry and BRST invariance, we argue why the decay of a massive color-octet vector state into a pair of on-shell massless gluons is possible in a non-Abelian SU(N) Yang-Mills theory, we constrain the form of the amplitude of the process and offer a simple understanding of these results in terms of effective-action operators.

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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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