A -55 kHz post-selection shift in helium-4 2^3S-2^3P spectroscopy is identified and modeled; the corrected frequency 276,764,094,712.45(86) kHz yields a 2.8σ discrepancy with muonic helium.
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Post-selection shifts the transition frequency of helium in an atomic beam
A -55 kHz post-selection shift in helium-4 2^3S-2^3P spectroscopy is identified and modeled; the corrected frequency 276,764,094,712.45(86) kHz yields a 2.8σ discrepancy with muonic helium.