Abstract
The use of high-precision measurements of the g factor of few-electron ions and its isotope shifts is put forward as a probe for physics beyond the Standard Model. The contribution of a hypothetical fifth fundamental force to the g factor is calculated for the ground state of H-like, Li-like and B-like ions, and employed to derive bounds on the parameters of that force. The weighted difference and especially the isotope shift of g factors are used in order to increase the experimental sensitivity to the new physics contribution. It is found that, combining measurements from four different isotopes of H-like, Li-like and B-like calcium ions at accuracy levels projected to be accessible in the near future, experimental results compatible with King planarity would constrain the new physics coupling constant more than one order of magnitude further than the best current atomic data and theory.
Highlights
The use of high-precision measurements of the g factor of few-electron ions and its isotope shifts is put forward as a probe for physics beyond the Standard Model
The weighted difference and especially the isotope shift of g factors are used in order to increase the experimental sensitivity to the new physics contribution
We demonstrate the relevance of the g factor of bound electrons to the search for new physics (NP)
Summary
The weighted difference and especially the isotope shift of g factors are used in order to increase the experimental sensitivity to the new physics contribution. Considering four different isotopes of a given ion and two different electronic states, a specific feature in the yet-to-be-obtained g-factor isotopeshift data, known as King nonplanarity, could be, with some care, understood as a potential signature of NP.
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