观察镜子：测量$^{19}$ Ne衰变中的$β$不对称性并寻找新的物理学
A look into mirrors: A measurement of the $β$-asymmetry in $^{19}$Ne decay and searches for new physics
摘要：
对中子和原子核中的同位旋$T=1/2$衰变的高精度测量为粒子物理学的标准模型的扩展提供了强的与模型无关的约束。测量了$^{19}$ Ne衰变中初始核自旋和发射正电子方向之间的$β$-不对称性，确定了这种衰变是最精确表征的核镜，并将费米-伽莫夫-泰勒混合比固定为$ρ= 1.6014(+21/-28)_{sys}(8)_{stat}$。这是一致的，与以前的，最精确的测量，产生一个值的CKM么正性参数$V_{ud}$在协议的核镜，中子和超允许的$β$ -衰变数据集，没有显示出第二类电流的证据，并可以有效地使用中子衰变数据放置一个限制奇异的张量耦合。
英文摘要：
High precision measurements of isospin $T=1/2$ decays in the neutron and nuclei provide strong model-independent constraints on extensions to the standard model of particle physics. A measurement of the $β$-asymmetry in $^{19}$Ne decay between the initial nuclear spin and the direction of the emitted positron is presented which establishes this decay as the most precisely characterized nuclear mirror and fixes the Fermi-to-Gamow-Teller mixing ratio to $ρ= 1.6014(+21/-28)_{sys}(8)_{stat}$. This is consistent with the previous, most precise measurement, produces a value of the CKM unitarity parameter $V_{ud}$ in agreement with the nuclear mirror, neutron and superallowed $β$-decay data sets, shows no evidence for second class currents, and can be effectively used with neutron decay data to place a limits on exotic tensor couplings.
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