{
  "id": "hep-ph/9905478",
  "version": "v2",
  "published": "1999-05-25T20:30:09.000Z",
  "updated": "1999-07-06T18:56:15.000Z",
  "title": "The Z -> bb decay asymmetry and flavor changing neutral currents",
  "authors": [
    "Michael S. Chanowitz"
  ],
  "comment": "10 pages, 1 figure. Revision includes additional predictions for rare K and B decays with new treatment of errors, additional references, some other changes in presentation",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "The measured value of A_b, the Z \\bar bb asymmetry parameter, disagrees with the Standard Model at 99% confidence level. If genuine the discrepancy could indicate new interactions unique to third generation quarks, implying enhanced Z penguin amplitudes. Enhanced rates are predicted for rare K and B decays, such as K^{+} --> pi^{+}\\bar nu nu, K_{L} --> pi^{0}\\bar nu nu, B --> X_{s}\\bar nu nu, and B_{s} --> \\bar mu mu. Measurements of epsilon^{\\prime}/epsilon then imply QCD penguin amplitudes must also be similarly enhanced. The Higgs sector of an SU(2)_L x SU(2)_R gauge theory has some of the features needed to explain these phenomena and would also imply right-handed penguin amplitudes.",
  "revisions": [
    {
      "version": "v2",
      "updated": "1999-07-06T18:56:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "flavor changing neutral currents",
      "bb decay asymmetry",
      "nu nu",
      "bb asymmetry parameter",
      "imply qcd penguin amplitudes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 500586,
      "adsabs": "1999hep.ph....5478C"
    }
  }
}