Charge conservation and the Pauli exclusion principle result from fundamental symmetries in the standard model of particle physics, and are typically taken as axiomatic. High-precision tests for small violations of these symmetries could point to new physics. Here we consider three models for violation of these processes, which would produce detectable ionization in the high-purity germanium detectors of the Majorana Demonstrator experiment. Using a 37.5 kg yr exposure, we report a lower limit on the electron mean lifetime, improving the previous best limit for the \(e\to {\nu }_{e}\overline{{\nu }_{e}}{\nu }_{e}\) decay channel by more than an order of magnitude. We also present searches for two types of violation of the Pauli exclusion principle, setting limits on the probability of an electron to be found in a symmetric quantum state.

电荷守恒和泡利不相容原理源自粒子物理学标准模型中的基本对称性，并且通常被视为公理化。对这些对称性的微小破坏的高精度测试可能会指向新的物理学。在这里，我们考虑三种违反这些过程的模型，这将在Majorana D演示器实验的高纯度锗探测器中产生可检测到的电离。使用 37.5 kg 年暴露量，我们报告了电子平均寿命的下限，将之前的最佳极限提高到了\(e\to {\nu }_{e}\overline{{\nu }_{e}} {\nu }_{e}\)衰减通道超过一个数量级。我们还提出了对两种违反泡利不相容原理的搜索，对在对称量子态中发现电子的概率设置了限制。