arXiv subjects

Hongjie Zong

Publications and source records attributed to Hongjie Zong.

4 recordsLinked to original sources

arXiv2003

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

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 $t\longrightarrow cV(V=g,γ,Z)$ and $t\longrightarrow cl_{i}l_{j}(l_{i}, l_{j}=τ, μ$, 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 $Br(t\longrightarrow cττ)\sim10^{-7}$, 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.

hep-ph↗

arXiv2003

Production of the top-pions at the THERA collider based $γp$ collisions

In the framework of the topcolor-assisted technicolor (TC2) models, we study the production of the top-pions $π^{0}_{t}$, $π_{t}^{\pm}$ via the processes $ep\toγc\toπ^{0}_{t}c$ and $ep\toγc\toπ^{\pm}_{t}b$ mediated by the anomalous top coupling $tcγ$. We find that the production cross section of the process $ep\toγc\toπ^{0}_{t}c$ is very small. With reasonable values of the parameters in TC2 models, the production cross section of the process $ep\toγc\toπ^{\pm}_{t}b$ can reach $ 1.2pb$. The charged top-pions $π^{\pm}_{t}$ might be directly observed via this process at the THERA collider based $γp$ collisions.

hep-ph↗

arXiv2003

The process $e^{+}e^{-}\toν\barνγ$ in topcolor-assisted technicolor models

In the context of topcolor-assisted technicolor (TC2) models, we consider the process $e^{+}e^{-}\to ν\barνγ$ and calculate the cross section of this process at leading order.It is shown that the extra U(1) gauge boson $Z^{\prime}$ predicted by TC2 models can give significant contributions to the process $e^{+}e^{-}\to ν_τ\barν_τγ$, which may be detected in the future high energy linear $e^{+}e^{-}$ collider(LC) experiments.

hep-ph↗

arXiv2003

Flavor changing Z decay $Z\to b\bar{s}(\bar{b}s)$ in topcolor-assisted technicolor models

In the context of topcolor-assisted technicolor (TC2) models, we examine the flavor changing (FC) Z decay $Z\to b\bar{s}(\bar{b}s)$ and calculate the contributions of the new particles predicted by TC2 models to the branching ratio Br($Z\to b\bar{s}+\bar{b}s$). We find that the contributions mainly come from the top-pions. In most of the parameter space, the Br($Z\to b\bar{s}+\bar{b}s$) can reach $10^{-5}$, which may be detected in near future experiments such as Giga-Z version of the TESLA. Thus, the FC Z decay $Z\to b\bar{s}(\bar{b}s)$ can be used to test TC2 models.

hep-ph↗