Sub-part-per-trillion test of the Standard Model with atomic hydrogen

www.nature.com

Sub-part-per-trillion test of the Standard Model with atomic hydrogen

www.nature.com

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NatureEnglish · 22 days ago

Nature, Published online: 11 February 2026; doi:10.1038/s41586-026-10124-3

Measurement of the 2S–6P transition in cryogenic atomic hydrogen using laser spectroscopy reveals a rp value that is 2.5-fold more precise than previous determinations and in excellent agreement with the muonic value, and tests the Standard Model to 0.7 parts per trillion.

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