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arXiv 1701.02205hep-ph
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探索标准模型标量扇区的扩展

Exploring Extensions of the Scalar Sector of the Standard Model

Najimuddin Khan

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PhD thesis, Indian Institute of Technology Indore, July 2016
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摘要：

在这篇论文中，标量扇区的各种扩展被认为是由不同的${SU(2)_L}$多重峰组成的。如果扩展标量扇区参与了电弱对称破缺，那么这些额外标量需要与已知的标准模型粒子耦合。在这项工作中，它已被证明，矢量玻色子散射涉及标量玻色子交换提供了一个互补的方式来直接搜索方法，以探讨标量部门。由于不同的扩展标量扇区具有相似类型的标量场，例如，一个额外的$CP$ --甚至是希格斯粒子，带电的希格斯粒子等等，这些新的物理模型可以产生类似类型的实验特征。在不同的矢量玻色子散射过程中，可以通过观察共振来区分这些模型。此外，共振的形状可以提供对这些模型的相关参数空间的进一步了解。在SM中，电弱真空是亚稳态的，重要的是探索扩展标量是否有一个答案。由于受$Z_2$对称性保护的标量弱相互作用大质量标量粒子可以作为可行的暗物质候选者，探索它们是否有助于延长宇宙的寿命是有趣的。有效希格斯势在这些新的额外标量的存在下得到修改，提高了电弱真空的稳定性。在各种扩展的纯量部门中已经进行了这样的工作。为了显示这些扩展扇区的不同参数的电弱稳定性的显式依赖，已经提出了各种相图。图形演示已被提供来说明如何的置信水平，在该水平上的电弱真空的稳定性被排除在外，取决于这样的新的物理参数。

英文摘要：

In this thesis, various extensions of the scalar sector have been considered comprising of different ${SU(2)_L}$ multiplets. If the extended scalar sector participates in the electroweak symmetry breaking then these extra scalars need to couple with the known standard model particles. In this work, it has been shown that the vector boson scattering involving scalar boson exchanges provide a complimentary way to direct search methods to probe into the scalar sector. As different extended scalar sectors have similar types of scalar fields, e.g., an extra $CP$-even Higgs, charged Higgs etc., these new physics models can give rise to the similar types of experimental signatures. It is possible to distinguish between such models at various vector boson scattering processes by looking at the resonances. Also, the shapes of the resonances can provide further insight to the relevant parameter space of these models. As in the SM, the electroweak vacuum is metastable, it is important to explore if an extended scalar has an answer in its reserve. As the scalar weakly interacting massive scalar particles protected by $Z_2$ symmetry can serve as viable dark matter candidates, it is interesting to explore if they help prolong the lifetime of the Universe. The effective Higgs potential gets modified in the presence of these new extra scalars, improving the stability of electroweak vacuum. Such an exercise has been undertaken in various kinds of extended scalar sectors. In order to show the explicit dependence of the electroweak stability on different parameters of these extended sectors, various kinds of phase diagrams have been presented. Graphical demonstrations have been provided to illustrate how the confidence level, at which stability of electroweak vacuum is excluded, depends on such new physics parameters.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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