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    "title": "Fermilab observes a 9.5 GeV dimuon resonance",
    "summary": "In 1977 Herb and colleagues observed a strong 9.5 GeV enhancement in opposite-sign dimuons from 400 GeV proton–nucleus collisions. In a subsequent analysis with approximately 26,000 dimuon events, Innes and colleagues reported two narrow peaks around 9.4 and 10.0 GeV, while treating a possible third near 10.4 GeV as unestablished.",
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        "description": "The July and September submitted papers analyze the same experiment with overlapping data, not independent discoveries. The initial broad enhancement was fitted with one or two Gaussians; the later study supports at least two narrow structures subject to detector resolution and continuum modeling, and explicitly leaves the third peak unestablished. The later authors compare a new quark–antiquark bound-state interpretation with model predictions; this is not a direct measurement of free quarks. Statistical and normalization uncertainties are separate. Both sources are submitted manuscripts; formal versions, the later paper’s published erratum and raw-data reanalysis remain open. Individual authorship differs by source: R. J. Fisk is listed only on the later paper.",
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      "statement": "# Fermilab observes a 9.5 GeV dimuon resonance\n\nIn 1977 Herb and colleagues observed a strong 9.5 GeV enhancement in opposite-sign dimuons from 400 GeV proton–nucleus collisions. In a subsequent analysis with approximately 26,000 dimuon events, Innes and colleagues reported two narrow peaks around 9.4 and 10.0 GeV, while treating a possible third near 10.4 GeV as unestablished.\n\n## Scientific scope\n\nThe July and September submitted papers analyze the same experiment with overlapping data, not independent discoveries. The initial broad enhancement was fitted with one or two Gaussians; the later study supports at least two narrow structures subject to detector resolution and continuum modeling, and explicitly leaves the third peak unestablished. The later authors compare a new quark–antiquark bound-state interpretation with model predictions; this is not a direct measurement of free quarks. Statistical and normalization uncertainties are separate. Both sources are submitted manuscripts; formal versions, the later paper’s published erratum and raw-data reanalysis remain open. Individual authorship differs by source: R. J. Fisk is listed only on the later paper.\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\nS. W. Herb; D. C. Hom; L. M. Lederman; J. C. Sens; H. D. Snyder; J. K. Yoh; J. A. Appel; B. C. Brown; C. N. Brown; W. R. Innes; K. Ueno; T. Yamanouchi; A. S. Ito; H. Jöstlein; D. M. Kaplan; R. D. Kephart; R. J. Fisk\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- [Observation of a Dimuon Resonance at 9.5 GeV in 400 GeV Proton-Nucleus Collisions](https://lss.fnal.gov/archive/1977/pub/Pub-77-058-E.pdf)\n- [Observation of Structure in the Upsilon Region](https://lss.fnal.gov/archive/1977/pub/Pub-77-086-E.pdf)\n",
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    "what_changed": "In 1977 Herb and colleagues observed a strong 9.5 GeV enhancement in opposite-sign dimuons from 400 GeV proton–nucleus collisions. In a subsequent analysis with approximately 26,000 dimuon events, Innes and colleagues reported two narrow peaks around 9.4 and 10.0 GeV, while treating a possible third near 10.4 GeV as unestablished.",
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