{
  "id": "hep-ph/9507439",
  "version": "v1",
  "published": "1995-07-27T21:41:53.000Z",
  "updated": "1995-07-27T21:41:53.000Z",
  "title": "Extracting $α$ from the CP Asymmetry in $B^0 \\to π^+ π^-$ Decays",
  "authors": [
    "F. DeJongh",
    "P. Sphicas"
  ],
  "comment": "18 pages latex, 9 eps files",
  "journal": "Phys.Rev. D53 (1996) 4930-4936",
  "doi": "10.1103/PhysRevD.53.4930",
  "categories": [
    "hep-ph"
  ],
  "abstract": "The extraction of the CKM angle $\\alpha$ from the asymmetry in $B^0 \\to \\pi^+\\pi^-$ vs ${\\bar B^0} \\to \\pi^+\\pi^-$ suffers from a currently unknown penguin contribution. Experimentally, one can determine the magnitude and phase of the CP asymmetry from a time-dependent analysis of tagged events, and the average rate for $B^0$ and $\\bar{B}^0$ decays to $\\pi^+\\pi^-$ from untagged events. These measurements, together with the magnitudes and relative phase of the tree and penguin diagrams, can in principle completely determine $\\alpha$, free of discrete ambiguities. We perform an error analysis on $\\alpha$ given assumptions on the values and uncertainties of both the measurements and theoretical inputs.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1995-07-27T21:41:53.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "12.15.Hh",
      "11.30.Er",
      "13.25.Hw"
    ],
    "keywords": [
      "cp asymmetry",
      "currently unknown penguin contribution",
      "ckm angle",
      "penguin diagrams",
      "measurements"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 397689
    }
  }
}