Title：Search for the new force with the generalized King relation
Time：2022/03/14 (Mon.) 13:30
Place：Online (Webex)
Link：https://nationaltaiwanuniversity-zbh.my.webex.com/nationaltaiwanuniversity-zbh.my/j.php?MTID=m37ac7f250f98e0bb2af313d66652a892

Abstract:
The atomic spectrum is affected by the differences in the nuclear state among isotopes. This spectrum change is called the isotope shift. It is known and tested well that the isotope shifts for two distinct follow a linear relation so called the King linearity. Recently, it has been proposed that the violation of the linear relation can be a good probe of the weakly interacting light boson. In the last year, such a linearity violation was reported. However, the result conflicts with other experimental constraints if the violation is attributed to the new force.
Therefore, it should originate from the higher order effects by the Standard Model. While new and precise results are rapidly obtained by experiments, the numerical progress to understand the observed violation is quite poor. We proposed a method to eliminate the higher order isotope shifts with the generalization of the King linearity. In collaboration with the quantum optics group at Kyoto University, we applied this method to the observed non linearity in the King relation with their new measurement of the isotope shift using neutral Ytterbium.
Finally, we obtained the new experimental bound to the weakly interacting light boson. This talk is based on 1710.11443, 1911.05345, and 2110.13544.