arXiv 2008.089412020-08-29hep-phnucl-thphysics.atom-phphysics.comp-ph

改进的$^{133}$ Cs宇称破坏计算对新物理的约束

Constraints on new physics from an improved calculation of parity violation in $^{133}$Cs

B. K. Sahoo, B. P. Das

备注：: 14 pages, 10 tables and 1 figure

摘要：

本文报道了用微扰相对论耦合团簇理论计算$^{133}$ Cs中$6s ~ ^2S_{1/2} - 7s ~ ^2S_{1/2}$跃迁的核自旋无关宇称破坏电偶极跃迁振幅（$E1_{PV}$）的结果，精度为0.3%.在本工作中，我们把低激发态和高激发态激发态对上述振幅的贡献放在同一个基础上处理，从而克服了以前高精度相对论耦合团簇计算的局限性。我们获得了上述跃迁的矢量极化率（$β$）的精确值，并将其与我们目前对$E1_{PV}$的计算结果和$Im(E1_{PV}/β)$的最新测量结果相结合，提取了核弱电荷（$Q_W$）;并分析了它与标准模型（SM）中的值的偏差，以限制SM之外的新物理的某些场景。

英文摘要：

We report the result of our calculation of the nuclear spin-independent parity violating electric dipole transition amplitude ($E1_{PV}$) for the $6s ~ ^2S_{1/2} - 7s ~ ^2S_{1/2}$ transition in $^{133}$Cs to an accuracy of 0.3\% using a variant of the perturbed relativistic coupled-cluster theory. In the present work, we treat the contributions of both the low-lying and high-lying excited states to the above mentioned amplitude on the same footing, thereby overcoming the limitations of previous high accuracy relativistic coupled cluster calculations. We obtain an accurate value for the vector polarizability ($β$) for the above transition and by combining it with the results from our present calculation of $E1_{PV}$ and the latest measurement of $Im(E1_{PV}/β)$, we extract the nuclear weak charge ($Q_W$); and analyze its deviation from its value in the Standard Model (SM) in order to constrain certain scenarios of new physics beyond the SM.

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英文摘要：

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