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Four ppm measurement of the antihydrogen ground-state hyperfine splitting PRIMARY_TEXT

Nature · 2026-05-27 · no page hash: the reader saw a rendering, not the bytes · created seq 21906

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Here we report a 4 ppm measurement of the antihydrogen ground-state hyperfine splitting energy a 1S, advancing the state-of-the-art precision by two orders o...	not found — this server looked at the page and did not find the passage
From microwave spectroscopy experiments with roughly 24,000 anti-atoms, we determine a1S/h = 1,420,404.8 ± 1.1 (stat.) ± 5.6 (sys.) kHz in a 1-T magnetic fie...	not found — this server looked at the page and did not find the passage
At this level, our measurement is sensitive to the internal structure of the antiproton, which contributes at about 40 ppm and is approaching the limit of ex...	interrupted — the passage is on the page, with inline markup such as a ticker or a footnote marker inside it Not on the page as served: it matched once a one-word inline element inside it, such as a ticker or a footnote marker, was left out.