Evidence for Nonlinear Isotope Shift in Yb + Search for New Boson
Name
PhysRevLett.125.123002.pdf
Description
Published version
Size
640.52 KB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Counts, Ian
Hur, Joonseok
Aude Craik, Diana PL
Jeon, Honggi
Leung, Calvin
Berengut, Julian C
Geddes, Amy
Kawasaki, Akio
Jhe, Wonho
Vuletić, Vladan
Date Issued
2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
We measure isotope shifts for five Yb+ isotopes with zero nuclear spin on two narrow optical quadrupole transitions S21/2→D23/2, S21/2→D25/2 with an accuracy of ∼300 Hz. The corresponding King plot shows a 3×10-7 deviation from linearity at the 3σ 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 nuclear 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.125.123002
