Decays Z --> ggg and Z-prime --> ggg in the minimal 331 model

Details Decays Z --> ggg and Z-prime --> ggg in the minimal 331 model Decays Z --> ggg and Z-prime --> ggg in the minimal 331 model

2009-06-10

arxiv.org/abs/0906.1852v2

Phys.Rev.D80:033006,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages and 21 figures

Scientific paper

10.1103/PhysRevD.80.033006

We perform a complete calculation at the one-loop level for the Zggg and Z'ggg couplings in the context of the minimal 331 model, which predicts the existence of a new Z' gauge boson and new exotic quarks. Bose symmetry is exploited to write a compact and manifest SU_C(3)-invariant vertex function for the Vggg (V=Z,Z') coupling. Previous results on the $Z\to ggg$ decay in the standard model are reproduced. It is found that this decay is insensitive to the effects of the new exotic quarks. This in contrast with the $Z'\to ggg$ decay, which is sensitive to both the standard model and exotic quarks, whose branching ratio is larger than that of the $Z\to ggg$ transition by about a factor of 4.

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