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.
A note on the fate of the Landau-Yang theorem in non-Abelian gauge theories
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abstract
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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Two-loop form factors for $P$-wave quarkonium production and decay
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.