Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.123002
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Funding
- NSF
- NSF CUA
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [795121]
- U.S. Department of Defense (DoD) through the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program
- Australian Research Council [DP190100974]
- William M. and Jane D. Fairbank Postdoctoral Fellowship of Stanford University
- Marie Curie Actions (MSCA) [795121] Funding Source: Marie Curie Actions (MSCA)
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We measure isotope shifts for five Yb+ isotopes with zero nuclear spin on two narrow optical quadrupole transitions S-2(1/2) -> D-2(3/2), S-2(1/2) -> E-2(4/2) with an accuracy of similar to 300 Hz. The corresponding King plot shows a 3 x 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 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.
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