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arXiv 2105.04565hep-phastro-ph.HEhep-exphysics.ins-det
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暗光子极限手册

Dark photon limits: a handbook

Andrea Caputo, Alexander J. Millar, Ciaran A. J. O'Hare, Edoardo Vitagliano

摘要:

暗光子是一种大质量的假想粒子,它通过与可见光子的动力学混合与标准模型相互作用。对于较小的混合参数值,暗光子可以逃避宇宙学界限,成为一个可行的暗物质候选者。由于与轴子产生的电磁信号的相似性,暗光子信号的几个界限只是对轴子haloscopes设定的历史界限的重新解释。然而,暗光子有一个轴子没有的特性:内禀极化。由于地球的自转,准确地解释这种偏振是不平凡的,高度依赖于实验,并取决于对暗光子产生机制的假设。我们表明,如果一个帐户的DP极化,和地球的旋转,实验的发现范围可以提高一个数量级以上。我们详细介绍了需要采取的策略,以适当优化暗光子搜索。这些包括明智地选择实验的位置和方向,以及战略性地安排任何重复测量的时间。位于$\pm$ 35 $^\circ$或$\pm$ 55 $^\circ$纬度的实验,在恒星日的不同时间进行三次观测,可以实现完全优化的灵敏度,并且对暗光子的偏振状态不敏感,因此对它的产生机制也不敏感。我们还指出,几个著名的搜索轴子采用测试信号的技术,排除他们的能力,设置排斥限制暗光子,因此不应该被重新解释。

英文摘要:

The dark photon is a massive hypothetical particle that interacts with the Standard Model by kinetically mixing with the visible photon. For small values of the mixing parameter, dark photons can evade cosmological bounds to be a viable dark matter candidate. Due to the similarities with the electromagnetic signals generated by axions, several bounds on dark photon signals are simply reinterpretations of historical bounds set by axion haloscopes. However, the dark photon has a property that the axion does not: an intrinsic polarisation. Due to the rotation of the Earth, accurately accounting for this polarisation is nontrivial, highly experiment-dependent, and depends upon assumptions about the dark photon's production mechanism. We show that if one does account for the DP polarisation, and the rotation of the Earth, an experiment's discovery reach can be enhanced by over an order of magnitude. We detail the strategies that would need to be taken to properly optimise a dark photon search. These include judiciously choosing the location and orientation of the experiment, as well as strategically timing any repeated measurements. Experiments located at $\pm$35$^\circ$ or $\pm$55$^\circ$ latitude, making three observations at different times of the sidereal day, can achieve a sensitivity that is fully optimised and insensitive to the dark photon's polarisation state, and hence its production mechanism. We also point out that several well-known searches for axions employ techniques for testing signals that preclude their ability to set exclusion limits on dark photons, and hence should not be reinterpreted as such.

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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