{
  "annotation_id": "7eb845fd-2ef2-4747-bdd5-6db7335421ca",
  "date_created": "2026-03-02T18:00:08.637000Z",
  "date_modified": "2026-03-02T18:00:08.637000Z",
  "file_hash": "5669df2a41aa4295684df46a63d6a980e3e136abd33bc18751dfb2a879483aa3",
  "private": false,
  "record": {
    "abstract": "The role of $q\\bar q$ components in the nucleon and the N(1440) resonance is\nstudied by explicit coupling of the lowest positive parity $qqqq\\bar q$ state\nto the $qqq$ components in the harmonic oscillator quark model. The lowest\nenergy $qqqq\\bar q$ component, where the 4-quark subsystem has the flavor-spin\nsymmetry $[4]_{FS}[22]_F[22]_S$, is close in energy to the lowest positive\nparity excitation of the nucleon in the $qqq$ quark model. The confining\ninteraction leads to a strong mixing of the $qqqq\\bar q$ system and the\npositive parity excited state of the $qqq$ system. This result is in line with\nthe phenomenological indications for a two-component structure of the N(1440)\nresonance. The presence of substantial $q\\bar q$ components in the N(1440) can\nbring about a reconciliation of the constituent quark model with the large\nempirical decay width of the N(1440).",
    "arxiv_id": "nucl-th/0609064",
    "authors": [
      "B. Julia-Diaz",
      "D. O. Riska"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1016/j.nuclphysa.2006.09.016",
    "journal_ref": "Nucl.Phys.A780:175-186,2006",
    "title": "The role of $qqqq\\bar{q}$ components in the nucleon and the N(1440)   resonance",
    "url": "https://arxiv.org/abs/nucl-th/0609064"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "35a69c22-5b8e-4fc7-bc65-e1cf22e26cad",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}