Dark Z at the International Linear Collider
Dark Z at the International Linear Collider
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DOI：
10.1103/physrevd.106.015027
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发表时间：
2022-05
影响因子：
5
通讯作者：
Yik Chuen San;M. Perelstein;P. Tanedo
中科院分区：
文献类型：
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作者：
Yik Chuen San;M. Perelstein;P. Tanedo
暗Z是一个大质量的阿贝尔规范玻色子，它通过与电弱扇区的动力学和质量混合耦合到标准模型。我们研究了在能量前沿正负电子对撞机，如拟议中的国际直线对撞机（ILC）的暗Z的现象。我们表明，精确的电弱约束和强子对撞机的电流边界允许一个黑暗的Z，是运动学上可访问的ILC与250 GeV或500 GeV的质心能量。此外，ILC对暗Z的搜索范围大大超过了高亮度LHC的预期范围。如果发现与暗Z一致的信号，则其将激励ILC在与暗Z质量匹配的质心能量处的专用运行。我们证明，在设计光度下运行一个月的时间，可以测量暗Z手征耦合到费米子的精确度。这种测量可以用来区分共振的竞争理论模型：例如，暗Z可以与纯动力学混合的暗光子区分开来。
A dark Z is a massive Abelian gauge boson which is coupled to the Standard Model through both kinetic and mass mixing with the electroweak sector. We study the phenomenology of the dark Z at an energy-frontier electron-positron collider, such as the proposed International Linear Collider (ILC). We show that precision electroweak constraints and the current bounds from the hadron colliders allow a dark Z that is kinematically accessible at the ILC with 250 GeV or 500 GeV center-of-mass energy. Further, the reach of the ILC searches for a dark Z significantly exceeds the expected reach of the high luminosity LHC. If a signal consistent with a dark Z is discovered, it would motivate a dedicated run of the ILC at the center-of-mass energy matching the dark Z mass. We demonstrate that a short one month run at design luminosity could measure the dark Z chiral couplings to fermions with percent precision. This measurement can be used to discriminate between competing theoretical models of the resonance: for example, the dark Z can be distinguished from a dark photon with purely kinetic mixing.