Non-universal gauge bosons $Z^{\prime}$ and rare top decays

Details Non-universal gauge bosons $Z^{\prime}$ and rare top decays Non-universal gauge bosons $Z^{\prime}$ and rare top decays

2003-09-23

arxiv.org/abs/hep-ph/0309255v2

Mod.Phys.Lett. A18 (2003) 2187-2194

Physics

High Energy Physics

High Energy Physics - Phenomenology

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Scientific paper

10.1142/S0217732303011915

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 $t\longrightarrow cV(V=g,\gamma,Z)$ and $t\longrightarrow cl_{i}l_{j}(l_{i}, l_{j}=\tau, \mu$, or $e)$. We show that the branching ratios of these processes can be significantly enhanced. Over a sizable region of the parameter space, we have $Br(t\longrightarrow cg)\sim10^{-5}$ and $Br(t\longrightarrow c\tau\tau)\sim10^{-7}$, 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.

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