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arXiv 1706.03073hep-ph
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三重规范耦合对类矢量轻子的约束

Constraints from Triple Gauge Couplings on Vectorlike Leptons

Enrico Bertuzzo, Pedro A. N. Machado, Yuber F. Perez-Gonzalez, Renata Zukanovich Funchal

摘要:

研究了无色类矢量费米子对三重规范耦合$W^+ W^- γ$和$W^+ W^- Z^0$的贡献。我们考虑的模型中,他们的耦合到标准模型希格斯玻色子是允许或禁止的量子数。我们评估未来的加速器FCC-ee,ILC和CLIC这些模型的参数的敏感性,假设他们将能够约束异常的三重规范耦合与精确的$δκ_V \sim \mathcal{O}(10^{-4})$,$V=γ,Z^0$。我们表明,在不同的质心能量的测量的组合有助于提高敏感性的矢量费米子的贡献,特别是当他们耦合到希格斯玻色子。事实上,在FCC-ee,特别是ILC和CLIC的测量,可能会把三重规耦合转换成一组新的精确参数,能够比倾斜参数或$H \to γγ$衰减更好地约束模型,即使假设后者的测量在新机器上可以实现相当大的改进。

英文摘要:

We study the contributions of colorless vectorlike fermions to the triple gauge couplings $W^+ W^- γ$ and $W^+ W^- Z^0$. We consider models in which their coupling to the Standard Model Higgs boson is allowed or forbidden by quantum numbers. We assess the sensitivity of the future accelerators FCC-ee, ILC and CLIC to the parameters of these models, assuming they will be able to constrain the anomalous triple gauge couplings with a precision $δκ_V \sim \mathcal{O}(10^{-4})$, $V=γ,Z^0$. We show that the combination of measurements at different center-of-mass energies helps to improve the sensitivity to the contribution of vectorlike fermions, in particular when they couple to the Higgs. In fact, the measurements at the FCC-ee and, especially, the ILC and the CLIC, may turn the triple gauge couplings into a new set of precision parameters able to constrain the models better than the oblique parameters or the $H \to γγ$ decay, even assuming the considerable improvement of the latter measurements achievable at the new machines.

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