If the helium ionization anomaly comes from a new scalar boson, positronium 1S-2S transitions should shift by 0.25 to 0.85 MHz, providing an independent test.
Precision physics of simple atoms: QED tests, nuclear structure and fundamental con- stants,
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Precision Positronium Spectroscopy as a Test of the Helium Ionization Energy Anomaly
If the helium ionization anomaly comes from a new scalar boson, positronium 1S-2S transitions should shift by 0.25 to 0.85 MHz, providing an independent test.