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    "title": "Muonium Lamb-shift and isolated excited-state hyperfine spectroscopy",
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    "area": "Atomic and fundamental physics / leptonic-atom microwave spectroscopy",
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        "title": "Precision measurement of the Lamb shift in Muonium (arXiv2108.12891v2)",
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        "title": "Measurement of the 2S1/2,F=0 to 2P1/2,F=1 transition in Muonium (arXiv2205.06202v1)",
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        "title": "Muonium Lamb shift: theory update and experimental prospects (arXiv2111.13951v1)",
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      "statement": "# Muonium Lamb-shift and isolated excited-state hyperfine spectroscopy\n\nThe Mu-MASS collaboration used a low-energy muon beam, carbon-foil muonium production and microwave-induced depletion of metastable atoms to measure the muonium n=2 Lamb shift. Ohayon and colleagues reported 1047.2±2.3(stat)±1.1(syst) MHz. Janka and colleagues then measured the isolated 2S1/2,F=0 to 2P1/2,F=1 transition at 580.6±6.8 MHz, deriving a Lamb shift of 1045.5±6.8 MHz and, together with the earlier transition measurement, a 2S hyperfine splitting of 559.6±7.2 MHz. The later line-shape analysis also identified a contribution from muonium in the n=3 excited state.\n\n## Scientific scope\n\nThese are related measurements with simulated trajectory-dependent line shapes, microwave-power corrections and residual excited-state contamination. The isolated transition offers a route to lower systematic error, while its reported statistical uncertainty is larger than that of the earlier measurement. The excited-state population and combined hyperfine interval are inferred through the stated model and shared experimental inputs. Agreement with bound-state QED supports model-specific limits on additional interactions; it does not establish exact CPT symmetry or exclude every explanation of muon magnetic-moment measurements. A linked theoretical update reports a roughly 200 kHz disagreement between two predictions and explicitly leaves its origin unresolved; neither experiment resolves that difference at its stated precision.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nB. Ohayon; G. Janka; I. Cortinovis; Z. Burkley; L. de Sousa Borges; E. Depero; A. Golovizin; X. Ni; Z. Salman; A. Suter; C. Vigo; T. Prokscha; P. Crivelli\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Precision measurement of the Lamb shift in Muonium (arXiv2108.12891v2)](https://arxiv.org/pdf/2108.12891v2)\n- [Measurement of the 2S1/2,F=0 to 2P1/2,F=1 transition in Muonium (arXiv2205.06202v1)](https://arxiv.org/pdf/2205.06202v1)\n- [Muonium Lamb shift: theory update and experimental prospects (arXiv2111.13951v1)](https://arxiv.org/pdf/2111.13951v1)\n",
      "summary": "The Mu-MASS collaboration used a low-energy muon beam, carbon-foil muonium production and microwave-induced depletion of metastable atoms to measure the muonium n=2 Lamb shift. Ohayon and colleagues reported 1047.2±2.3(stat)±1.1(syst) MHz. Janka and colleagues then measured the isolated 2S1/2,F=0 to 2P1/2,F=1 transition at 580.6±6.8 MHz, deriving a Lamb shift of 1045.5±6.8 MHz and, together with the earlier transition measurement, a 2S hyperfine splitting of 559.6±7.2 MHz. The later line-shape analysis also identified a contribution from muonium in the n=3 excited state.",
      "title": "Muonium Lamb-shift and isolated excited-state hyperfine spectroscopy"
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