No Landau-Yang in QCD
High Energy Physics - Phenomenology
2016-11-30 v3
Abstract
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.
Keywords
Cite
@article{arxiv.1508.07115,
title = {No Landau-Yang in QCD},
author = {W. Beenakker and R. Kleiss and G. Lustermans},
journal= {arXiv preprint arXiv:1508.07115},
year = {2016}
}
Comments
4 pages, 3 figures