标题： 氘对由标准模型扩展所支配的对称性破坏的增强灵敏度的演示 显示英文标题

标题： Demonstration of deuterium's enhanced sensitivity to symmetry violations governed by the Standard-Model Extension

摘要： 我们对基态氘的两个跃迁进行了超精细光谱分析，并搜索了可能表现为观测跃迁频率日变化的\CPT 和洛伦兹对称性破坏。 已讨论了标准模型扩展框架中的几个非相对论质子系数。 首次对具有动量幂次$k$=2,4 的自旋无关系数进行了限制。 通过利用氘核中核子相对动量带来的灵敏度增强，改进了自旋相关系数的限制。 对于具有$k$=2 和 4 的系数，其最佳先前限制分别被超越了 4 和 14 个数量级。 此外，我们发现氘的零场超精细分裂为\SI{327.3843549(0.0000028)}{\mega \hertz}。 这与文献一致，并且是对此量最精确的束流测量。 显示英文摘要

摘要： We have performed hyperfine spectroscopy of two transitions in ground-state deuterium and searched for violations of \CPT and Lorentz symmetry that would manifest as sidereal variations of the observed transition frequencies. Several non-relativistic proton coefficients of the Standard-Model Extension framework have been addressed. The spin-independent coefficients with momentum power $k$=2,4 are constrained for the first time. Bounds on spin-dependent coefficients are improved by exploiting a sensitivity enhancement originating from the relative momenta of the nucleons in the deuteron. The best previous constraints by hydrogen maser measurements are surpassed by 4 and 14 orders of magnitude for coefficients with $k$=2 and 4, respectively. Furthermore, we find a deuterium zero-field hyperfine splitting of \SI{327.3843549(0.0000028)}{\mega \hertz}. This is in agreement with the literature and presents the most precise in-beam measurement of this quantity.