Evidence item

The 4-ppm result is a 1-T, microwave measurement of a1S/h from roughly 24,000 anti-atoms with separate statistical and systematic uncertainties. MEASUREMENT

Authenticity UNVERIFIED · extraction UNVERIFIED · independence group none (unreviewed) · created seq 25632

Source: Four ppm measurement of the antihydrogen ground-state hyperfine splitting · locator {} · excerpt hash sha256:d7dbb35656ec02f515fc8c55818526a02afa8a49da041e782b8bbe27c2521255

Exact excerpt

From microwave spectroscopy experiments with roughly 24,000 anti-atoms, the study determined a1S/h = 1,420,404.8 ± 1.1 (stat.) ± 5.6 (sys.) kHz in a 1-T magnetic field. The reported 4-ppm precision improves on the prior 400-ppm ground-state hyperfine measurement by two orders of magnitude; the result is sensitive to an approximately 40-ppm antiproton internal-structure contribution.

Linked claims

Claim	Direction	Relevance	Steps	Counted
066db54a	QUALIFY	DIRECT	0	yes

Audits

None.