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arXiv 2111.04787hep-exhep-ph
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CLIC对新物理学的潜力

The CLIC potential for new physics

Jan Klamka

摘要:

紧凑型直线对撞机(CLIC)是未来电子-正电子对撞机的成熟选择,其质心能量高达3 TeV。它采用了一种新颖的双束加速技术,可提供高达100 MeV/m的加速梯度。CLIC将以分阶段的方式建造和运行,目前假设有三个质心能量级,分别为380 GeV,1.5 TeV和3 TeV。CLIC第一阶段将重点关注希格斯玻色子和顶夸克的精确测量。所谓的“Higgs-strahlung”过程($e^+ e^- \to \mathrm{ZH}$)是实现希格斯玻色子玻色子衰变的模型无关测量和耦合提取的关键。精确的顶夸克测量将包括对产生阈值扫描,这被认为是确定顶夸克质量的最精确方法。随后的两个能量阶段将允许扩展标准模型研究,包括直接测量希格斯自耦合和汤川耦合,但他们的主要目标将是寻找超越标准模型现象的特征。在这方面的贡献是一个选择最近的结果显示CLIC实验的敏感性,不同的BSM物理方案。与强子对撞机相比,CLIC的低背景条件提供了更大的发现潜力,特别是通过电弱和/或希格斯玻色子相互作用产生。这包括扩展标量扇区的场景,也是由暗物质激发的,可以使用相关的生产过程或涉及电弱规范玻色子的级联衰变来搜索。在广泛的模型中,新的粒子几乎可以被发现到运动学极限,而间接搜索灵敏度扩展到${\cal{O}}(100)$ TeV尺度。

英文摘要:

The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. It incorporates a novel two-beam acceleration technique offering accelerating gradient of up to 100 MeV/m. CLIC would be built and operated in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV, and 3 TeV. The first CLIC stage will be focused on precision Higgs and top quark measurements. The so called "Higgs-strahlung" process ($e^+ e^- \to \mathrm{ZH}$) is a key for a model independent measurement of Higgs boson decays and extraction of its couplings. Precision top quark measurements will include the pair-production threshold scan, which is assumed to be the most precise method for the top-quark mass determination. The two subsequent energy stages will allow for extended Standard Model studies, including the direct measurement of the Higgs self-coupling and the top Yukawa coupling, but their main goals will be to search for signatures of Beyond the Standard Model phenomena. Presented in this contribution is a selection of recent results showing sensitivity of CLIC experiment to diverse BSM physics scenarios. Compared with hadron colliders, the low background conditions at CLIC provide extended discovery potential, in particular for the production through electroweak and/or Higgs boson interactions. This includes scenarios with extended scalar sectors, also motivated by dark matter, which can be searched for using associated production processes or cascade decays involving electroweak gauge bosons. In a wide range of models, new particles can be discovered almost up to the kinematic limit while the indirect search sensitivity extends up to ${\cal{O}}(100)$ TeV scales.

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