{
  "id": "hep-ph/0204212",
  "version": "v2",
  "published": "2002-04-18T07:45:57.000Z",
  "updated": "2002-06-11T06:43:15.000Z",
  "title": "Can the CP asymmetries in $B\\to ψK_S$ and $B\\to ψK_L$ differ?",
  "authors": [
    "Yuval Grossman",
    "Alexander L. Kagan",
    "Zoltan Ligeti"
  ],
  "comment": "13 pages, revtex4. Minor changes. Version to appear in PLB",
  "journal": "Phys.Lett. B538 (2002) 327-334",
  "categories": [
    "hep-ph"
  ],
  "abstract": "In the standard model the CP asymmetries in $B\\to \\psi K_S$ and $B\\to \\psi K_L$ are equal in magnitude and opposite in sign to very good approximation. We compute the order $\\epsilon_K$ corrections to each of these CP asymmetries and find that they give a deviation from $\\sin 2\\beta$ at the half percent level, which may eventually be measurable. However, the correction to $a_{CP}(B\\to \\psi K_S)+a_{CP}(B\\to \\psi K_L)$ due to $\\epsilon_K$ is further suppressed. The dominant corrections to this sum, at the few times $10^{-3}$ level, come from the $B$ lifetime difference, and CP violation in $B- \\bar B$ mixing and $B \\to \\psi K$ decay. New physics could induce a significant difference in the $\\sin(\\Delta m_B t)$ time dependence in the asymmetries if and only if the \"wrong-flavor\" amplitudes $B \\to \\psi \\bar K$ or $\\bar B \\to \\psi K$ are generated. A scale of new physics that lies well below the weak scale would be required. Potential scenarios are therefore highly constrained, and do not appear feasible. A direct test is proposed to set bounds on such effects.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2002-06-11T06:43:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cp asymmetries",
      "half percent level",
      "direct test",
      "potential scenarios",
      "weak scale"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1016/S0370-2693(02)02027-0"
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 585580
    }
  }
}