LUXE-NPOD：在LUXE上使用光学转储进行新物理搜索
LUXE-NPOD: new physics searches with an optical dump at LUXE
摘要：
我们提出了一种新的方法来寻找弱相互作用的大质量粒子，利用系统的两个属性，涉及高能电子和强激光脉冲之间的碰撞。第一个性质是电子-强激光碰撞导致大通量的硬光子，因为激光有效地表现为厚介质。第二个特性是发射的光子在激光器内部自由流动，因此对于它们来说，激光器有效地表现为非常薄的介质。结合这两个特征意味着电子强激光碰撞是一种可以有效地将紫外电子转换为大通量硬共线光子的装置。我们进一步建议将这种独特的大而硬的光子通量引导到物理转储上，从而能够在以前从未探测过的参数区域中产生弱相互作用的大质量粒子。我们将这种新的装置称为“光学转储”或NPOD（新物理学搜索与光学转储）。在Eu. XFEL进行的LUXE实验具有上述实验概念所需的所有基本成分。我们讨论了如何在实验的最后一次物理转储后添加一个探测器来重建一个新的自旋为0的粒子的双光子衰变产物，从而在实践中实现这一概念。我们表明，即使有一个相对较短的转储，搜索仍然可以是背景免费的。值得注意的是，即使使用40 TW激光器，这对应于初始运行，并且肯定使用350 TW激光器，主要运行一年的数据采集，LUXE-NPOD将能够探测赝标量和标量场模型的未知领域，特别是探测质量超过100 MeV的标量理论的自然。
英文摘要：
We propose a novel way to search for feebly interacting massive particles, exploiting two properties of systems involving collisions between high energy electrons and intense laser pulses. The first property is that the electron-intense-laser collision results in a large flux of hard photons, as the laser behaves effectively as a thick medium. The second property is that the emitted photons free-stream inside the laser and thus for them the laser behaves effectively as a very thin medium. Combining these two features implies that the electron-intense-laser collision is an apparatus which can efficiently convert UV electrons to a large flux of hard, co-linear photons. We further propose to direct this unique large and hard flux of photons onto a physical dump which in turn is capable of producing feebly interacting massive particles, in a region of parameters that has never been probed before. We denote this novel apparatus as ``optical dump'' or NPOD (new physics search with optical dump). The proposed LUXE experiment at Eu.XFEL has all the required basic ingredients of the above experimental concept. We discuss how this concept can be realized in practice by adding a detector after the last physical dump of the experiment to reconstruct the two-photon decay product of a new spin-0 particle. We show that even with a relatively short dump, the search can still be background free. Remarkably, even with a 40 TW laser, which corresponds to the initial run, and definitely with a 350 TW laser, of the main run with one year of data taking, LUXE-NPOD will be able to probe uncharted territory of both models of pseudo-scalar and scalar fields, and in particular probe natural of scalar theories for masses above 100 MeV.
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