The Proton Radius Puzzle
Fuente:
arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866908993014726656 |
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| author | Miller, Gerald A. |
| author_facet | Miller, Gerald A. |
| contents | Pohl et al. measured the energy difference between the 2P and 2S states of muonic hydrogen and used it to determine a precise value of the proton radius. The result disagreed significantly from values extracted from electronic hydrogen and elastic electron-proton scattering. This discrepancy was exciting because it indicated a breakdown of Coulomb's law. In more technical terms, the discrepancy indicated that a fundamental property of the Standard Model, known as lepton universality, could be violated. This chapter explains the origins, meaning and significance of the puzzle. A resolution, based on very recent experiments, is stated. The proton radius puzzle is no more. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_15546 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Proton Radius Puzzle Miller, Gerald A. Nuclear Experiment High Energy Physics - Phenomenology Atomic Physics Pohl et al. measured the energy difference between the 2P and 2S states of muonic hydrogen and used it to determine a precise value of the proton radius. The result disagreed significantly from values extracted from electronic hydrogen and elastic electron-proton scattering. This discrepancy was exciting because it indicated a breakdown of Coulomb's law. In more technical terms, the discrepancy indicated that a fundamental property of the Standard Model, known as lepton universality, could be violated. This chapter explains the origins, meaning and significance of the puzzle. A resolution, based on very recent experiments, is stated. The proton radius puzzle is no more. |
| title | The Proton Radius Puzzle |
| topic | Nuclear Experiment High Energy Physics - Phenomenology Atomic Physics |
| url | https://arxiv.org/abs/2604.15546 |