论文标题
电子束式颗粒的通过：SLACMQ的精炼限制和估计Na64e的灵敏度
Passage of millicharged particles in the electron beam-dump: refining constraints from SLACmQ and estimating sensitivity of NA64e
论文作者
论文摘要
Millicharged颗粒（MCP）出现在标准模型的许多动机扩展中，并且是实验搜索的流行主题。我们研究了MCP在培养基中的相互作用，在加速器实验中产生的MCP通量的衰减。举例来说，以SLACMQ的专用MCP搜索，我们证明了这种效果可以显着影响对MCP参数空间的最终敏感性，而其基本部分仍未得到探索。将我们的分析应用于SLACMQ实验[53]，我们在详细介绍了它们的排除范围。 [54]。我们还表明，这个新的重新开放的区域，MCP群众在$ 10^{ - 4} $ ev-$ 1 $ GEV和费用$ \ gtrsim 10^{ - 5} e $可以有效地探究Na64 $ e $ e $实验。光MCP主要由虚拟光子在电子散射核中产生。重MCP的主要来源是由核上电子产生的载体介子的衰变。
Millicharged particles (MCPs) arise in many well-motivated extensions of the Standard Model and are a popular subject for experimental searches. We investigate attenuation of the MCP flux produced at accelerator experiments due to their interactions in the media. Considering, as an example, the dedicated MCP search at SLACmQ, we demonstrate that this effect can significantly affect the final sensitivity to the MCP parameter space leaving its essential part still unexplored. Applying our analysis to the SLACmQ experiment [53], we correct their exclusion bounds in close accordance with Ref. [54]. We also show that this newly reopened area with the MCP masses in the range $10^{-4}$ eV - $1$ GeV and charges $\gtrsim 10^{-5} e$ can be effectively probed by the NA64$e$ experiment at the CERN SPS. Light MCPs are mostly produced by virtual photon in electron scattering off nucleus. The main source of heavy MCP is decays of vector mesons, produced by the electrons on nuclei.
