{
  "id": "1407.7984",
  "version": "v1",
  "published": "2014-07-30T10:09:55.000Z",
  "updated": "2014-07-30T10:09:55.000Z",
  "title": "Role of the possible $Σ^*(\\frac{1}{2}^-)$ state in the $Λp \\to Λp π^0$ reaction",
  "authors": [
    "Ju-Jun Xie",
    "Jia-Jun Wu",
    "Bing-Song Zou"
  ],
  "comment": "8 pages, 5 figures",
  "categories": [
    "nucl-th",
    "hep-ex",
    "hep-ph",
    "nucl-ex"
  ],
  "abstract": "The $\\Lambda p \\to \\Lambda p \\pi^0$ reaction near threshold is studied within an effective Lagrangian method. The production process is described by single-pion and single-kaon exchange. In addition to the role played by the $\\Sigma^*(1385)$ resonance of spin-parity $J^P = 3/2^+$, the effects of a newly proposed $\\Sigma^*$ ($J^P = 1/2^-$) state with mass and width around $1380$ MeV and $120$ MeV are investigated. We show that our model leads to a good description of the experimental data on the total cross section of the $\\Lambda p \\to \\Lambda p \\pi^0$ reaction by including the contributions from the possible $\\Sigma^*(\\frac{1}{2}^-)$ state. However, the theoretical calculations by considering only the $\\Sigma^*(1385)$ resonance fail to reproduce the experimental data, especially for the enhancement close to the reaction threshold. On the other hand, it is found that the single-pion exchange is dominant. Furthermore, we also demonstrate that the angular distributions provide direct information of this reaction, hence could be useful for the investigation of the existence of the $\\Sigma^*(\\frac{1}{2}^-)$ state and may be tested by future experiments.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-07-30T10:09:55.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.75.-n",
      "14.20.Gk",
      "13.30.Eg"
    ],
    "keywords": [
      "experimental data",
      "total cross section",
      "single-kaon exchange",
      "effective lagrangian method",
      "production process"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevC.90.055204",
      "journal": "Physical Review C",
      "year": 2014,
      "month": "Nov",
      "volume": 90,
      "number": 5,
      "pages": "055204"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1308917,
      "adsabs": "2014PhRvC..90e5204X"
    }
  }
}