{
  "id": "hep-ex/0512037",
  "version": "v1",
  "published": "2005-12-15T18:25:09.000Z",
  "updated": "2005-12-15T18:25:09.000Z",
  "title": "Search for Anomalous Couplings in Top Decay at Hadron Colliders",
  "authors": [
    "S. Tsuno",
    "I. Nakano",
    "Y. Sumino",
    "R. Tanaka"
  ],
  "comment": "21 pages, 15 figures",
  "journal": "Phys.Rev. D73 (2006) 054011",
  "doi": "10.1103/PhysRevD.73.054011",
  "categories": [
    "hep-ex",
    "hep-ph"
  ],
  "abstract": "We present a quantitative study on sensitivities to the top-decay anomalous couplings, taking into account realistic experimental conditions expected at Tevatron and LHC. A double angular distribution of W and charged lepton in the top decay is analyzed, using ttbar events in the lepton+jets channel. In order to improve sensitivities to the anomalous couplings, we apply two techniques: (1) We use a likelihood fitting method for full kinematical reconstruction of each top event. (2) We develop a new effective spin reconstruction method for leptonically-decayed top quarks; this method does not require spin information of the antitop side. For simplicity, we neglect couplings of right-handed bottom quark as well as CP violating couplings. The 95% C.L. estimated bound on a ratio of anomalous couplings reads -0.81 < f_2/f_1 < -0.70, -0.12<f_2/f_1<0.14 using 1000 reconstructed top events at Tevatron, while -0.74<f_2/f_1<-0.72, -0.01<f_2/f_1<0.01 is expected with 100k reconstructed top events at LHC, where only statistical errors are taken into account. A two-fold ambiguity in the allowed range remains when the number of events exceeds a few hundred.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2005-12-15T18:25:09.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.65.Ha"
    ],
    "keywords": [
      "hadron colliders",
      "account realistic experimental conditions",
      "effective spin reconstruction method",
      "top-decay anomalous couplings"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 700449
    }
  }
}