{
  "id": "0807.3080",
  "version": "v3",
  "published": "2008-07-21T18:03:26.000Z",
  "updated": "2008-08-04T21:24:36.000Z",
  "title": "Implications for CP asymmetries of improved data on $B \\to K^0 π^0$",
  "authors": [
    "Michael Gronau",
    "Jonathan L. Rosner"
  ],
  "comment": "Note added, to be published in Physics Letters B",
  "journal": "Phys.Lett.B666:467-471,2008",
  "doi": "10.1016/j.physletb.2008.08.004",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "The decay $B^0 \\to K^0 \\pi^0$, dominated by a $b \\to s$ penguin amplitude, holds the potential for exhibiting new physics in this amplitude. In the pure QCD penguin limit one expects $\\ckp = 0$ and $\\skp = \\sin 2 \\beta$ for the coefficients of $\\cos \\Delta m t$ and $\\sin \\Delta m t$ in the time-dependent CP asymmetry. Small non-penguin contributions lead to corrections to these expressions which are calculated in terms of isospin-related $B\\to K\\pi$ rates and asymmetries, using information about strong phases from experiment. We study the prospects for incisive tests of the Standard Model through examination of these corrections. We update a prediction $\\ckp=0.15\\pm 0.04$, pointing out the sensitivity of a prediction $\\skp\\approx 1$ to the measured branching ratio for $B^0\\to K^0\\pi^0$ and to other observables.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2008-08-04T21:24:36.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "12.15.Ji",
      "12.15.Hh",
      "13.25.Hw",
      "14.40.Nd"
    ],
    "keywords": [
      "implications",
      "pure qcd penguin limit",
      "time-dependent cp asymmetry",
      "small non-penguin contributions",
      "prediction"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Physics Letters B",
      "year": 2008,
      "month": "Sep",
      "volume": 666,
      "number": 5,
      "pages": 467
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 791119,
      "adsabs": "2008PhLB..666..467G"
    }
  }
}