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arXiv 1503.06423hep-ph
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排列的双Higgs二重态模型中的变味顶衰变

Flavour-changing top decays in the aligned two-Higgs-doublet model

Gauhar Abbas, Alejandro Celis, Xin-Qiang Li, Jie Lu, Antonio Pich

摘要:

我们进行了一个完整的单循环计算的两体变味顶部衰变$t \rightarrow c h$和$t \rightarrow c V$($V= γ, Z$),在对齐的两个希格斯偶极子模型。我们评估模型参数对相关分支比的影响,同时考虑到来自味道数据和希格斯属性测量的约束。假设$125$ ~GeV的希格斯粒子对应于CP守恒排列的双希格斯粒子模型中最轻的CP偶标量,我们发现这种变味的顶衰变速率低于LHC未来高光度阶段的预期灵敏度。在双光子通道中的希格斯信号强度的测量被发现在限制的大小的$t \rightarrow c h$衰变率时,模型的带电标量是轻的起着重要的作用。

英文摘要:

We perform a complete one-loop computation of the two-body flavour-changing top decays $t \rightarrow c h$ and $t \rightarrow c V$ ($V= γ, Z$), within the aligned two-Higgs-doublet model. We evaluate the impact of the model parameters on the associated branching ratios, taking into account constraints from flavour data and measurements of the Higgs properties. Assuming that the $125$~GeV Higgs corresponds to the lightest CP-even scalar of the CP-conserving aligned two-Higgs-doublet model, we find that the rates for such flavour-changing top decays lie below the expected sensitivity of the future high-luminosity phase of the LHC. Measurements of the Higgs signal strength in the di-photon channel are found to play an important role in limiting the size of the $t \rightarrow c h$ decay rate when the charged scalar of the model is light.

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