{
  "id": "1607.02058",
  "version": "v1",
  "published": "2016-07-07T15:50:09.000Z",
  "updated": "2016-07-07T15:50:09.000Z",
  "title": "On the structure observed in the in-flight ${}^{3}\\text{He} ( K^{-} , \\, Λp ) n$ reaction at J-PARC",
  "authors": [
    "Takayasu Sekihara",
    "Eulogio Oset",
    "Angels Ramos"
  ],
  "comment": "27 pages, 18 EPS figures",
  "categories": [
    "hep-ph",
    "nucl-ex",
    "nucl-th"
  ],
  "abstract": "A theoretical investigation is done to clarify the origin of the peak structure observed near the $K^{-} p p$ threshold in the in-flight ${}^{3}\\text{He} ( K^{-}, \\, \\Lambda p ) n$ reaction of the J-PARC E15 experiment, which could be a signal of the lightest kaonic nuclei, that is, the $\\bar{K} N N (I=1/2)$ state. For the investigation, we evaluate the $\\Lambda p$ invariant mass spectrum assuming two possible scenarios to interpret the experimental peak. One assumes that the $\\Lambda (1405)$ resonance is generated after the emission of an energetic neutron from the absorption of the initial $K^-$, not forming a bound state with the remaining proton. This uncorrelated $\\Lambda (1405) p$ system subsequently decays into the final $\\Lambda p$. The other scenario implies that, after the emission of the energetic neutron, a $\\bar{K} N N$ bound state is formed, decaying eventually into a $\\Lambda p$ pair. Our results show that the experimental signal observed in the in-flight ${}^{3}\\text{He} ( K^{-} , \\, \\Lambda p ) n$ reaction at J-PARC is qualitatively well reproduced by the assumption that a $\\bar{K} N N$ bound state is generated in the reaction, definitely discarding the interpretation in terms of an uncorrelated $\\Lambda (1405) p$ state.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-07-07T15:50:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "bound state",
      "energetic neutron",
      "j-parc e15 experiment",
      "lightest kaonic nuclei",
      "invariant mass spectrum assuming"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 27,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}