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Search for sub-millicharged particles at J-PARC
Journal of High Energy Physics ( IF 5.4 ) Pub Date : 2021-05-05 , DOI: 10.1007/jhep05(2021)031
Jeong Hwa Kim , In Sung Hwang , Jae Hyeok Yoo

We studied the feasibility of an experiment searching for sub-millicharged particles (χs) using 30 GeV proton fixed-target collisions at J-PARC. The detector is composed of two layers of stacked scintillator bars and PMTs and is proposed to be installed 280 m from the target. The main background is a random coincidence between two layers due to dark counts in PMTs, which can be reduced to a negligible level using the timing of the proton beam. With NPOT = 1022 which corresponds to running the experiment for three years, the experiment provides sensitivity to χs with the charge down to 5 × 105 in mχ < 0.2 GeV/c2 and 8 × 104 in mχ < 1.6 GeV/c2. This is the regime largely uncovered by previous experiments. We also explored a few detector designs to achieve optimal sensitivity to χs. The photoelectron yield is the main driver, but the sensitivity does not have a strong dependence on detector configuration in the sub-millicharge regime.

A preprint version of the article is available at ArXiv.


中文翻译:

在J-PARC上搜索亚微带电粒子

我们研究了一个实验搜索的用于子millicharged颗粒(可行性χ用30电子伏特的质子固定目标的碰撞在J-PARC或多个)。该探测器由两层堆叠的闪烁器棒和PMT组成,建议安装在距目标280 m处。主要背景是由于PMT中的暗计数导致两层之间的随机重合,使用质子束的定时可以将其减少到可以忽略的水平。与Ñ POT = 10个22,其对应于运行该实验三年,该实验提供了灵敏度χ s的电荷下降到5 × 10 - 5χ < 02电子伏特/ c ^ 2和8 × 10 - 4χ < 1 6 GeV / c 2。这是以前的实验基本上未发现的机制。我们还探索了一些检测器设计,以实现对χs的最佳灵敏度。光电子产量是主要驱动因素,但在次毫电荷状态下,灵敏度对检测器配置的依赖性不强。

该文章的预印本可在ArXiv上获得。
更新日期:2021-05-06
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