Two-body Z' decays in the minimal 331 model
Abstract
The two-body decays of the extra neutral boson Z2 predicted by the minimal 331 model are analyzed. At the three-level it can decay into standard model particles as well as exotic quarks and the new gauge bosons predicted by the model. The decays into a lepton pair are strongly suppressed, with Br(Z2 --> l+l-) ~ 10-2 and Br(Z2 --> l ) ~ 10-3. In the bosonic sector, Z2 would decay mainly into a pair of bilepton gauge bosons, with a branching ratio below the 0.1 level. The Z2 boson has thus a leptophobic and bileptophobic nature and it would decay dominantly into quark pairs. The anomaly-induced decays Z2 --> Z1γ and Z2 --> Z1Z1, which occurs at the one-loop level are studied. It is found that Br(Z2 --> Z1γ) ~ 10-9 and Br(Z2 --> Z1Z1) ~ 10-6 at most. As for the Z2 --> W+W- and Z2 --> Z1H decays, with H a relatively light Higgs boson, they are induced via Z'-Z mixing. It is obtained that Br(Z2 --> W+W-) ~ 10-2 and Br (Z2 --> Z1H) ~ 10-5. We also examine the flavor changing neutral current decays Z2 --> tc and Z2 --> tu, which may have branching fractions as large as 10-3 and 10-5, respectively, and thus may be of phenomenological interest.
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