{
  "id": "1005.2381",
  "version": "v1",
  "published": "2010-05-13T17:48:03.000Z",
  "updated": "2010-05-13T17:48:03.000Z",
  "title": "Study of a Narrow pi+ pi- Peak at about 755 MeV/c**2 in pbar n --> 2 pi+ 3 pi- Annihilation at Rest",
  "authors": [
    "Mario Gaspero"
  ],
  "comment": "8 pages, 3 figures, talk given at the 13.th International Conference on Hadron Spectroscopy, Tallahassee, FL, USA, November 29 - December 4, 2009. Superseeds arXiv:0902.1126 [hep-ex].",
  "categories": [
    "hep-ex"
  ],
  "abstract": "A narrow peak in the pi+ pi- mass distribution was seen by the Rome-Syracuse Collaboration in pbar n --> 2 pi+ 3 pi- annihilation at rest in 1970. It was ignored for 40 years. The reanalysis of this peak finds that it has the mass 757.4 +- 2.8_stat +- 1.1_sys MeV/c**2 and a width consistent with the experimental resolution. The evidence of the peak is 5.2 standard deviations. The peak is generated in (1.03 +- 0.21_stat +- 0.21_sys)% of the pbar n annihilations at rest. No spin analysis is possible with the statistics of the experiment but there are arguments suggesting that it has JP = 0+.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-05-13T17:48:03.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "21.10.Jx",
      "25.80.Hp",
      "29.40.Cs",
      "24.30.Gd"
    ],
    "keywords": [
      "annihilation",
      "spin analysis",
      "rome-syracuse collaboration",
      "peak finds",
      "narrow peak"
    ],
    "tags": [
      "conference paper",
      "journal article"
    ],
    "publication": {
      "doi": "10.1063/1.3483331"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 855713,
      "adsabs": "2010AIPC.1257..272G"
    }
  }
}