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Non-Universal Gauge Bosons Z′ and Rare Top Decays

Chongxing Yue

Department of Physics, Liaoning Normal University, Dalian 116029, China

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Hongjie Zong

College of Physics and Information Engineering, Henan Normal University, Henan 453002, China

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, and

Lanjun Liu

College of Physics and Information Engineering, Henan Normal University, Henan 453002, China

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https://doi.org/10.1142/S0217732303011915Cited by:15 (Source: Crossref)

Abstract

We study a new method for detecting non-universal gauge bosons Z′ via considering their effects on rare top decays. We calculate the contributions of the non-universal gauge bosons Z′ predicted by topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models on the rare top decays t → cV (V = g,γ,Z) and t → cl_il_j (l_i,l_j = τ,μ, or e). We show that the branching ratios of these processes can be significantly enhanced. Over a sizeable region of the parameter space, we have Br(t → cg) ~ 10^-5 and Br(t → cττ) ~ 10^-7, which may approach the observable threshold of near future experiments. Non-universal gauge bosons Z′ may be detected via the rare top decay processes at the top-quark factories such as the CERN LHC.

Keywords:

PACS: 14.70.Pw, 12.60.Cn, 14.65.Ha

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