论文标题
非线性同位素转移的证据yb $^+$搜索新玻色子
Evidence for Nonlinear Isotope Shift in Yb$^+$ Search for New Boson
论文作者
论文摘要
我们测量五yb $^+$同位素的同位素转移，在两个狭窄的光学四极管过渡上，核旋转为零，$ {}^2S_ {1/2} \ rightArrow {}^}^2d_ {3/2 {3/2} $，$ {} $ {}^2s_ {1/2}^$ {1/2}^2D $ \ sim 300 $ hz。相应的国王图显示了$ 3 \ times 10^{ - 7} $与3 $σ$不确定性级别的线性偏差。这样的非线性可以以新的肺泡载体的形式表明超出标准模型（SM）的物理性，或者是由SM内的高阶核效应引起的。我们将二次场变化确定为在观察到的尺度下非线性的可能因素，并显示如何在将来使用非线性模式，更准确的测量值将新玻色子信号与核效应分开。
We measure isotope shifts for five Yb$^+$ isotopes with zero nuclear spin on two narrow optical quadrupole transitions ${}^2S_{1/2} \rightarrow {}^2D_{3/2}$, ${}^2S_{1/2} \rightarrow {}^2D_{5/2}$ with an accuracy of $\sim 300$ Hz. The corresponding King plot shows a $3 \times 10^{-7}$ deviation from linearity at the 3 $σ$ uncertainty level. Such a nonlinearity can indicate physics beyond the Standard Model (SM) in the form of a new bosonic force carrier, or arise from higher-order nuclear effects within the SM. We identify the quadratic field shift as a possible contributor to the nonlinearity at the observed scale, and show how the nonlinearity pattern can be used in future, more accurate measurements to separate a new-boson signal from nuclear effects.
