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Germann, M.; Patra, S.; Karr, J.-Ph; Hilico, L.; Korobov, V. I.; Salumbides, E. J.; Eikema, K. S. E.; Ubachs, W.; Koelemeij, J. C. J.
Physical review research, 06/2021, Volume: 3, Issue: 2Journal Article
We present a parts-per-million test of quantum electrodynamics (QED) in the HD^{+} molecular hydrogen ion, improving on previous tests based on vibrational and rotational transitions by factors of 76 and 1.4, respectively. The test is performed following a unified statistical approach that also produces improved constraints on physics beyond the standard model. We furthermore show how individual constraints derived from the various degrees of freedom in HD^{+} and antiprotonic helium can be combined to enhance the sensitivity, thus ruling out “fifth forces” on the Ångstrom scale that are 10^{11} times weaker than the electromagnetic interaction.
