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One of its microwave transitions came out 4.5 standard errors away from theory.","posed_since":"2020","precise":"The UCL measurement of the positronium $2^3S_1$ to $2^3P_0$ interval gave $18501.02(61)\\,\\mathrm{MHz}$ versus the QED prediction $18498.25(8)\\,\\mathrm{MHz}$ (Gurung et al 2020), a $4.5\\,\\sigma$ difference; later work by the same group traced line-shape distortions in related intervals to microwave reflections, but the $2^3P_0$ tension has not been removed. Determine whether the $2^3P_0$ discrepancy survives an independent method such as Ramsey separated-field spectroscopy.","problem_ref":null,"references":"","settled_by":"An independent $2^{3}\\mathrm{S}_{1}$ to $2^{3}\\mathrm{P}_{0}$ measurement at sub-0.3 MHz uncertainty with a different microwave geometry.","status_note":"","title":"Positronium $2^3\\mathrm{S}_1$ to $2^3\\mathrm{P}_0$ interval disagrees with 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