论文标题
Xenon1t过剩：一些可能的背景
XENON1T Excess: Some Possible Backgrounds
论文作者
论文摘要
这项工作是对Xenon1t环境中一些可能的背景源的研究，可能会影响下侧电子后坐力事件的能量谱，并可能导致观察到的过量。我们已经确定了一些其他可能的背景，例如$^{41} $ ca，$^{49} $ v，$^{63} $ ni，$^{106} $ ru和$^{125} $ sb来自cosmogenic生产，前两个emit sonoenergetic $ x $ $ x $ - $ x $ $β$β$β $^{210} $ pb，从$^{222} $ rn的衰减链中从材料中发出的液体Xenon或同位素，例如$^{137} $ CS，是由于中子捕获而产生的。我们通过改变他们的个体费率，以了解是否可以出现有助于低能量过剩或它们的存在受到数据的限制，从这些背景和观察到的过剩事件中进行了$χ^2 $拟合。我们还研究了同时存在多个这样的背景的可能性，以及这如何影响单个背景所需的解释过剩所要求的速率。
This work is a study of some possible background sources in the XENON1T environment which might affect the energy spectrum of electronic recoil events in the lower side and might contribute to the observed excess. We have identified some additional possible backgrounds, like $^{41}$Ca, $^{49}$V, $^{63}$Ni, $^{106}$Ru and $^{125}$Sb coming from cosmogenic production, where the former two emit monoenergetic $X$-rays and the latter three have $β$ decays, or isotopes, like $^{210}$Pb, from the decay chain of $^{222}$Rn emanated in liquid xenon from the materials, or isotopes, like $^{137}$Cs, produced due to neutron capture. We perform a $χ^2$ fitting of the ER spectrum from these backgrounds along with tritium to the observed excess events by varying their individual rates to understand whether they can be present to contribute to the low energy excess or their presence is constrained from the data. We also study the possibility of simultaneous presence of more than one such backgrounds, and how this affects the rates required by individual backgrounds to explain the excess.
