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 ⁴¹Ca, ⁴⁹V, ⁶³Ni, ¹⁰⁶Ru and ¹²⁵Sb coming from cosmogenic production, where the former two emit monoenergetic X-rays and the latter three have β decays, or isotopes, like ²¹⁰Pb, from the decay chain of ²²²Rn emanated in liquid xenon from the materials, or isotopes, like ¹³⁷Cs, produced due to neutron capture. We perform a ${\chi }^2$ 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.

这项工作是对XENON1T环境中一些可能的背景源的研究，这些背景源可能会影响下侧电子反冲事件的能谱，并可能导致观测到的过量。我们已经确定了一些其他可能的背景，例如来自宇宙产生的⁴¹ Ca，⁴⁹ V，⁶³ Ni，¹⁰⁶ Ru和¹²⁵ Sb，其中前两个发出单能X射线，后三个发出β衰变或同位素，例如²¹⁰铅，来自液态氙中²²² Rn的衰变链，是由诸如^137之类的材料或同位素发出的Cs，由于中子俘获而产生。我们执行${\chi }^{\mathrm{2个}}$通过改变它们的单个比率，从这些背景中将ER光谱与tri一起拟合到观察到的过量事件，以了解它们是否存在以有助于低能量过剩或它们的存在受到数据的限制。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解释过量所要求的比率。