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arXiv 1503.04391hep-ph
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双Higgs二重态模型中具有变味中性标量相互作用的稀有top衰变$t \rightarrow c γ$

Rare top decay $t \rightarrow c γ$ with flavor changing neutral scalar interactions in two Higgs doublet model

Ricardo Gaitán, Estela A. Garcés, Roberto Martinez, Jose Halim Montes de Oca

摘要:

最近发现的希格斯玻色子极大地激发了标准模型之外的具有额外标量的模型。第三类双希格斯模型考虑了标量势的最一般情况,允许中性CP-偶标量场和CP-奇标量场之间的混合。本文研究了由汤川矩阵给出的顶粲-Higgs耦合产生中性变味时,单圈能级上的$t\rightarrow cγ$衰变.例如,$\tanβ=2.5$和一般中性希格斯混合参数$1.16\leqα_1\leq1.5$、$-0.48\leqα_2\leq-0.1$的分支比$Br(t\rightarrow cγ)\sim 10^{-6}$的值。对于由实验数据约束的模型参数,积分亮度为300 $fb^{-1}$的$t\rightarrow c γ$衰变的事件数估计为$10\lesssim N_{Eff}\lesssim 100$。

英文摘要:

Models beyond the Standard Model with extra scalars have been highly motivated by the recent discovery of a Higgs boson. The Two Higgs Doublet Model Type III considers the most general case for the scalar potential, allowing mixing between neutral CP-even and CP-odd scalar fields. This work presents the results of the study on the $t\rightarrow cγ$ decay at one loop level if neutral flavor changing is generated by top-charm-Higgs coupling given by the Yukawa matrix. For instance, a value for the branching ratio $Br(t\rightarrow cγ)\sim 10^{-6}$ for $\tanβ=2.5$ and general neutral Higgs mixing parameters, $1.16\leqα_1\leq1.5$, $-0.48\leqα_2\leq-0.1$. The number of events for the $t\rightarrow c γ$ decay with an integrated luminosity of 300 $fb^{-1}$ is estimated as $10\lesssim N_{Eff}\lesssim 100$ for the parameters of the model constrained by experimental data.

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