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要旨

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 currently accessible accuracy
levels, 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.