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arXiv 1504.07059hep-ph
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轻子特有的双Higgs模型作为μ子$g-2$反常的一种解

Lepton-Specific Two Higgs Doublet Model as a Solution of Muon $g-2$ Anomaly

Tomohiro Abe, Ryosuke Sato, Kei Yagyu

摘要:

我们讨论了X型(轻子特异性)双Higgs二重态模型作为μ子$g-2$反常的一个解。我们考虑各种实验的参数空间上的限制,如直接搜索额外的希格斯玻色子在LEP II和大型强子对撞机运行-I,电弱精密观测,衰减的$B_s \to μ^+μ^-$,和轻子衰变的τ轻子。我们发现,测量的τ衰变提供了最重要的约束,它排除了参数区域,可以解释的μ子$g-2$异常在1 $σ$水平。然后,我们讨论了额外的希格斯玻色子和标准模型的希格斯玻色子($h$)的现象,以探讨在对撞机实验的$g-2$数据所青睐的场景。我们发现,$4τ$,$3τ$和$4τ+ W/Z$签名预计作为额外的希格斯玻色子在大型强子对撞机的主要信号。此外,我们澄清,$hττ$耦合的值被预测为标准模型值的倍约$-1.6$到$-1.0$,和分支分数的$h\to γγ$模式偏离标准模型预测的$-30\%$到$-15\%$。此外,我们发现,奇异的衰变模式,$h$衰变到$Z$玻色子和轻CP-奇标量玻色子,是允许的,它的分支分数可以是百分之几。$h$性质的这些偏差将在未来的对撞机实验中通过精确测量进行测试。

英文摘要:

We discuss the Type-X (lepton-specific) two Higgs doublet model as a solution of the anomaly of the muon $g-2$. We consider various experimental constraints on the parameter space such as direct searches for extra Higgs bosons at the LEP II and the LHC Run-I, electroweak precision observables, the decay of $B_s \to μ^+μ^-$, and the leptonic decay of the tau lepton. We find that the measurement of the tau decay provides the most important constraint, which excludes the parameter region that can explain the muon $g-2$ anomaly at the 1$σ$ level. We then discuss the phenomenology of extra Higgs bosons and the standard model-like Higgs boson ($h$) to probe the scenario favored by the $g-2$ data at the collider experiments. We find that the $4τ$, $3τ$ and $4τ+ W/Z$ signatures are expected as the main signal of the extra Higgs bosons at the LHC. In addition, we clarify that the value of the $hττ$ coupling is predicted to be the standard model value times about $-1.6$ to $-1.0$, and the branching fraction of the $h\to γγ$ mode deviates from the standard model prediction by $-30\%$ to $-15\%$. Furthermore, we find that the exotic decay mode, $h$ decaying into the $Z$ boson and a light CP-odd scalar boson, is allowed, and its branching fraction can be a few percent. These deviations in the property of $h$ will be tested by the precision measurements at future collider experiments.

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