{
  "id": "hep-ph/9910221",
  "version": "v2",
  "published": "1999-10-04T17:30:52.000Z",
  "updated": "1999-10-22T10:11:23.000Z",
  "title": "A Comparative Study of the Decays $B \\to (K,K^*) \\ell^+ \\ell^-$ in Standard Model and Supersymmetric Theories",
  "authors": [
    "A. Ali",
    "Patricia Ball",
    "L. T. Handoko",
    "G. Hiller"
  ],
  "comment": "36 pages, 12 figures (require epsfig.sty), 8 Tables, LaTeX2e; subsection 6.4 corrected, minor changes in numerical results, Figures 3 and 9 to 12 modified; submitted to Physical Review D",
  "journal": "Phys.Rev.D61:074024,2000",
  "doi": "10.1103/PhysRevD.61.074024",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "Using improved theoretical calculations of the decay form factors in the Light Cone-QCD sum rule approach, we investigate the decay rates, dilepton invariant mass spectra and the forward-backward (FB) asymmetry in the decays $B \\to (K,K^*) \\ell^+ \\ell^-$ ($\\ell^\\pm =e^\\pm,\\mu^\\pm,\\tau^\\pm$) in the standard model (SM) and a number of popular variants of the supersymmetric (SUSY) models. Theoretical precision on the differential decay rates and FB-asymmetry is estimated in these theories taking into account various parametric uncertainties. We show that existing data on $B \\to X_s \\gamma$ and the experimental upper limit on the branching ratio ${\\cal B}(B \\to K^* \\mu^+ \\mu^-)$ provide interesting bounds on the coefficients of the underlying effective theory. We argue that the FB-asymmetry in $B \\to K^* \\ell^+ \\ell^-$ constitutes a precision test of the SM and its measurement in forthcoming experiments may reveal new physics. In particular, the presently allowed large-$\\tan \\beta$ solutions in SUGRA models, as well as more general flavor-violating SUSY models, yield FB-asymmetries which are characteristically different from the corresponding ones in the SM.",
  "revisions": [
    {
      "version": "v2",
      "updated": "1999-10-22T10:11:23.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "standard model",
      "supersymmetric theories",
      "comparative study",
      "light cone-qcd sum rule approach",
      "decay rates"
    ],
    "tags": [
      "journal article",
      "famous paper"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 36,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 508100
    }
  }
}