{
  "id": "1006.3363",
  "version": "v4",
  "published": "2010-06-17T03:19:57.000Z",
  "updated": "2011-02-07T14:27:34.000Z",
  "title": "Radiative E1 decays of X(3872)",
  "authors": [
    "Tian-Hong Wang",
    "Guo-Li Wang"
  ],
  "comment": "9 pages, 4 figures, 2 tables, version to be published in Phys. Lett. B",
  "journal": "Phys.Lett.B697:233-237,2011",
  "doi": "10.1016/j.physletb.2011.02.014",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "Radiative E1 decay widths of $\\rm X(3872)$ are calculated through the relativistic Salpeter method, with the assumption that $\\rm X(3872)$ is the $\\chi_{c1}$(2P) state, which is the radial excited state of $\\chi_{c1}$(1P). We firstly calculated the E1 decay width of $\\chi_{c1}$(1P), the result is in agreement with experimental data excellently, then we calculated the case of $\\rm X(3872)$ with the assignment that it is $\\chi_{c1}$(2P). Results are: ${\\Gamma}({\\rm X(3872)}\\rightarrow \\gamma \\sl J/\\psi)=33.0$ keV, ${\\Gamma}({\\rm X(3872)}\\rightarrow \\gamma \\psi(2S))=146$ keV and ${\\Gamma}({\\rm X(3872)}\\rightarrow \\gamma \\psi(3770))=7.09$ keV. The ratio ${{\\rm Br(X(3872)}\\rightarrow\\gamma\\psi(2{\\rm S}))}/{{\\rm Br(X(3872)}\\rightarrow \\gamma {\\sl J}/\\psi)}=4.4$ agrees with experimental data by BaBar, but larger than the new up-bound reported by Belle recently. With the same method, we also predict the decay widths: ${\\Gamma}(\\chi_{b1}(1\\rm P))\\rightarrow \\gamma \\Upsilon(1\\rm S))=30.0$ keV, ${\\Gamma}(\\chi_{b1}(2\\rm P))\\rightarrow \\gamma \\Upsilon(1\\rm S))=5.65$ keV and ${\\Gamma}(\\chi_{b1}(2\\rm P))\\rightarrow \\gamma \\Upsilon(2S))=15.8$ keV, and the full widths: ${\\Gamma}(\\chi_{b1}(1\\rm P))\\sim 85.7$ keV, ${\\Gamma}(\\chi_{b1}(2\\rm P))\\sim 66.5$ keV.",
  "revisions": [
    {
      "version": "v4",
      "updated": "2011-02-07T14:27:34.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.60.-r",
      "13.25.Gv",
      "13.25.Ft",
      "13.40.Hq"
    ],
    "keywords": [
      "experimental data",
      "relativistic salpeter method",
      "radiative e1 decay widths",
      "full widths",
      "radial excited state"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Physics Letters B",
      "year": 2011,
      "month": "Mar",
      "volume": 697,
      "number": 3,
      "pages": 233
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 858573,
      "adsabs": "2011PhLB..697..233W"
    }
  }
}