{
  "id": "0806.3893",
  "version": "v1",
  "published": "2008-06-24T13:49:19.000Z",
  "updated": "2008-06-24T13:49:19.000Z",
  "title": "Observation of e+e- --> rho+rho- near sqrt(s)=10.58 GeV",
  "authors": [
    "The BABAR Collaboration",
    "B. Aubert"
  ],
  "comment": "8 pages, 4 postscript figures, submitted to PRD-RC",
  "journal": "Phys.Rev.D78:071103,2008",
  "doi": "10.1103/PhysRevD.78.071103",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We report the first observation of $e^+e^- \\to \\rho^+\\rho^-$, in a data sample of 379 $fb^{-1}$ collected with the BABAR detector at the {PEP-II} $e^+e^-$ storage ring at center-of-mass energies near $\\sqrt{s} = 10.58 GeV. We measure a cross section of $\\sigma({e^+e^-\\} \\to \\rho^+ \\rho^-) = {19.5 \\pm 1.6(stat) \\pm 3.2(syst) fb}$. Assuming production through single-photon annihilation, there are three independent helicity amplitudes. We measure the ratios of their squared moduli to be $|{F}_{00}|^2 : |{F}_{10}|^2 : |{F}_{11}|^2 = 0.51 \\pm 0.14(stat) \\pm 0.07(syst) : 0.10 \\pm 0.04(stat) \\pm 0.01(syst) : 0.04 \\pm 0.03(stat) \\pm 0.01(syst)$. The $|{F}_{00}|^2$ result is inconsistent with the prediction of 1.0 made by QCD models with a significance of 3.1 standard deviations including systematic uncertainties.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-06-24T13:49:19.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.40.Ev",
      "13.66.Bc",
      "13.25.-k"
    ],
    "keywords": [
      "first observation",
      "data sample",
      "babar detector",
      "center-of-mass energies",
      "qcd models"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2008,
      "month": "Oct",
      "volume": 78,
      "number": 7,
      "pages": "071103"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 789011,
      "adsabs": "2008PhRvD..78g1103A"
    }
  }
}