Evidence for Nonlinear Isotope Shift in Yb + Search for New Boson
| Autor: | Counts, Ian, Hur, Joonseok, Aude Craik, Diana P. L., Jeon, Honggi, Leung, Calvin, Berengut, Julian C., Geddes, Amy, Kawasaki, Akio, Jhe, Wonho, Vuletić, Vladan |
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| Jazyk: | angličtina |
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| Zdroj: | Physical Review Letters. 125(12) |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.125.123002 |
| Popis: | 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 $\sigma$ 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. |
| Databáze: | OpenAIRE |
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