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    "title": "Continuous-wave two-photon positronium 1S–2S spectroscopy with coincidence detection",
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    "area": "Atomic and fundamental physics / precision positronium laser spectroscopy",
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            "citation": "Precision continuous-wave laser measurement of the 1tripletS1 to2tripletS1 interval in positronium (arXiv2512.16018v1)",
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      "scope": {
        "description": "The interval inference depends on the assumed positronium velocity and spatial distributions, line-shape simulation and laser-frequency calibration. A frequency comb was unavailable during data collection; wavemeter metrology dominated the uncertainty. Agreement between the two fits uses the same experiment and related model inputs and is not an independent replication. The semi-analytical expression uses perturbative depletion and fitted profile approximations, with visible deviations at high power and low speed. Some printed formula and correction conventions remain unresolved. This record describes the 2025 preprint; a later journal publication may differ. Sub-ppb or few-ppt precision remained prospective.",
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        {
          "citation": "Precision continuous-wave laser measurement of the 1tripletS1 to2tripletS1 interval in positronium (arXiv2512.16018v1)",
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      "statement": "# Continuous-wave two-photon positronium 1S–2S spectroscopy with coincidence detection\n\nDe Sousa Borges and colleagues measured the positronium 1³S₁ → 2³S₁ interval with continuous-wave two-photon excitation and photoionization by the same laser. Coincidence detection of the released positron and two annihilation photons suppressed background; 1124 selected events from about 12 days supported a transition frequency of 1,233,607,224.1±6.0 MHz, or 4.9 parts per billion. They also developed an approximate semi-analytical line-shape model and compared its fitted centres with their Monte Carlo model and the measured spectrum.\n\n## Scientific scope\n\nThe interval inference depends on the assumed positronium velocity and spatial distributions, line-shape simulation and laser-frequency calibration. A frequency comb was unavailable during data collection; wavemeter metrology dominated the uncertainty. Agreement between the two fits uses the same experiment and related model inputs and is not an independent replication. The semi-analytical expression uses perturbative depletion and fitted profile approximations, with visible deviations at high power and low speed. Some printed formula and correction conventions remain unresolved. This record describes the 2025 preprint; a later journal publication may differ. Sub-ppb or few-ppt precision remained prospective.\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\nLucas de Sousa Borges; Edward Thorpe-Woods; Evans Javary; Paolo 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 continuous-wave laser measurement of the 1tripletS1 to2tripletS1 interval in positronium (arXiv2512.16018v1)](https://arxiv.org/pdf/2512.16018v1)\n",
      "summary": "De Sousa Borges and colleagues measured the positronium 1³S₁ → 2³S₁ interval with continuous-wave two-photon excitation and photoionization by the same laser. Coincidence detection of the released positron and two annihilation photons suppressed background; 1124 selected events from about 12 days supported a transition frequency of 1,233,607,224.1±6.0 MHz, or 4.9 parts per billion. They also developed an approximate semi-analytical line-shape model and compared its fitted centres with their Monte Carlo model and the measured spectrum.",
      "title": "Continuous-wave two-photon positronium 1S–2S spectroscopy with coincidence detection"
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    "title": "Continuous-wave two-photon positronium 1S–2S spectroscopy with coincidence detection",
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    "what_changed": "De Sousa Borges and colleagues measured the positronium 1³S₁ → 2³S₁ interval with continuous-wave two-photon excitation and photoionization by the same laser. Coincidence detection of the released positron and two annihilation photons suppressed background; 1124 selected events from about 12 days supported a transition frequency of 1,233,607,224.1±6.0 MHz, or 4.9 parts per billion. They also developed an approximate semi-analytical line-shape model and compared its fitted centres with their Monte Carlo model and the measured spectrum.",
    "scope": "De Sousa Borges and colleagues measured the positronium 1³S₁ → 2³S₁ interval with continuous-wave two-photon excitation and photoionization by the same laser. Coincidence detection of the released positron and two annihilation photons suppressed background; 1124 selected events from about 12 days supported a transition frequency of 1,233,607,224.1±6.0 MHz, or 4.9 parts per billion. They also developed an approximate semi-analytical line-shape model and compared its fitted centres with their Monte Carlo model and the measured spectrum. The interval inference depends on the assumed positronium velocity and spatial distributions, line-shape simulation and laser-frequency calibration. A frequency comb was unavailable during data collection; wavemeter metrology dominated the uncertainty. Agreement between the two fits uses the same experiment and related model inputs and is not an independent replication. The semi-analytical expression uses perturbative depletion and fitted profile approximations, with visible deviations at high power and low speed. Some printed formula and correction conventions remain unresolved. This record describes the 2025 preprint; a later journal publication may differ. Sub-ppb or few-ppt precision remained prospective.",
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