{
  "id": "2006.14918",
  "version": "v1",
  "published": "2020-06-26T11:40:31.000Z",
  "updated": "2020-06-26T11:40:31.000Z",
  "title": "First Search for the $K_L \\to π^0 γ$ Decay",
  "authors": [
    "J. K. Ahn",
    "B. Beckford",
    "M. Campbell",
    "S. H. Chen",
    "J. M. Choi",
    "J. Comfort",
    "K. Dona",
    "M. S. Farrington",
    "N. Hara",
    "H. Haraguchi",
    "Y. B. Hsiung",
    "M. Hutcheson",
    "T. Inagaki",
    "M. Isoe",
    "I. Kamiji",
    "E. J. Kim",
    "J. L. Kim",
    "H. M. Kim",
    "T. K. Komatsubara",
    "K. Kotera",
    "J. W. Lee",
    "G. Y. Lim",
    "C. Lin",
    "Q. S. Lin",
    "Y. Luo",
    "T. Mari",
    "T. Matsumura",
    "D. Mcfarland",
    "K. Miyazaki",
    "R. Murayama",
    "K. Nakagiri",
    "H. Nanjo",
    "H. Nishimiya",
    "Y. Noichi",
    "T. Nomura",
    "T. Nunes",
    "M. Ohsugi",
    "H. Okuno",
    "J. C. Redeker",
    "K. Sato",
    "T. Sato",
    "Y. Sato",
    "N. Shimizu",
    "T. Shimogawa",
    "T. Shinkawa",
    "S. Shinohara",
    "K. Shiomi",
    "R. Shiraishi",
    "S. Su",
    "Y. Sugiyama",
    "S. Suzuki",
    "Y. Tajima",
    "M. Taylor",
    "M. Tecchio",
    "M. Togawa",
    "T. Toyoda",
    "Y. C. Tung",
    "Q. H. Vuong",
    "Y. W. Wah",
    "H. Watanabe",
    "T. Yamanaka",
    "H. Y. Yoshida"
  ],
  "categories": [
    "hep-ex"
  ],
  "abstract": "We report the first search for the $K_L \\to \\pi^0 \\gamma$ decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single event sensitivity of $(7.1\\pm 0.3_{\\rm stat.} \\pm 1.6_{\\rm syst.})\\times 10^{-8}$, no candidate event was observed in the signal region. The upper limit on the branching fraction was set to be $1.7\\times 10^{-7}$ at the 90\\% confidence level.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-26T11:40:31.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first search",
      "single event sensitivity",
      "j-parc koto experiment",
      "confidence level",
      "lorentz invariance"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}