Z'-> ggg decay in left-right symmetric models with three and four fermion families

Details Z'-> ggg decay in left-right symmetric models with three and four fermion families Z'-> ggg decay in left-right symmetric models with three and four fermion families

2010-11-23

arxiv.org/abs/1011.4986v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 7 figures

Scientific paper

We study the Z'-> ggg decay in the context of a left-right symmetric gauge theory. We obtain a branching ratio BR(Z'-> ggg)=\Gamma(Z'->ggg)/ \Gamma(Z'-> q\bar{q})= (1.2-2.8) x 10^{-5} for m_{Z'}=(700-1500) GeV. We also study the contribution of a fourth fermion family. We find an enhancement in the branching ratio for Z' masses close to the \bar{b'}b' threshold and a dip for Z' masses close to the \bar{t'}t' threshold. Using the values of the fourth generation quark masses allowed by electroweak precision data we obtain a branching ratio BR(Z'-> ggg)= (1-6)x 10^{-5} for m_{Z'}=(700-1500) GeV.

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