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10–14 Nov 2021
暨南大学
Asia/Shanghai timezone

Top-quark rare decays $t \rightarrow cg(g)$ in the aligned two-Higgs-doublet Model

Not scheduled
15m
暨南大学

暨南大学

Speaker

Ms Fang-Min Cai (CCNU)

Description

We update the Standard Model predictions for the branching ratios of the top-quark rare decays $t \to cg(g)$ in the Standard Model and focus on evaluating the maximum they can be in the aligned two-Higgs-doublet model (A2HDM), their properties are also discussed briefly in the 2HDM with $\mathcal{Z}_2$ symmetries. With the constraints on the alignment parameters from flavour observables, we find that the branching ratios of $t \to cg$ and $t \to cgg$ are in the same order and can reach about $3.79\times 10^{-9}$ and $6.80\times 10^{-9}$ in the A2HDM, respectively; while the branching ratio of $t \to cgg$ is nearly three orders of magnitude as large as the one of $t \to cg$ in the SM. Moreover, there are no significant enhancements in the 2HDM than that in the SM for these two decays. Compared with the measurements in the high-luminosity colliders in the near future, both the branching ratios of $t \to cg$ and $t \to cgg$ within the A2HDM are out of the sensitivity of the HL-LHC and FCC-hh.
Presentation type Oral

Primary author

Ms Fang-Min Cai (CCNU)

Co-authors

Dr Funatsu Shuichiro (CCNU) Prof. Xin-Qiang Li (CCNU) Prof. Ya-Dong Yang (Zhengzhou university)

Presentation materials

There are no materials yet.