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Abramishvili, R; Adamov, G; Allin, A; Angélique, J C; Anishchik, V; Aznabayev, D; Ban, G; Ban, Y; Bondar, A E; Chau, T T; Chen, S J; da Silva, W; Densham, C; Devidze, G; Drutskoy, A; Duginov, V; Eguchi, Y; Epshteyn, L B; Finger Jr, M; Finger, M; Fukao, Y; Gabriel, J L; Grigoriev, D N; Hai, V H; Hamada, E; Hashim, I H; Hayashi, O; Hayashi, T; Hiasa, T; Ibrahim, Z A; Igarashi, Y; Ishibashi, K; Jansen, A; Jonsson, P; Kachelhoffer, T; Kawagoe, K; Kawashima, R; Kazak, N; Kazanin, V F; Khvedelidze, A; Koike, M; Kozyrev, A N; Kravchenko, M; Kumsiashvili, G; Kuno, Y; Kurup, A; Lagrange, B; Lee, M J; Li, W G; Loan, T; Lomidze, D; Lomidze, I; Loveridge, P; Makida, Y; Markin, O; Melkadze, A; Melnik, A; Miyazaki, Y; Mohamad Idris, F; Moiseenko, A; Nakai, Y; Nakatsugawa, Y; Nakazawa, Y; Nash, J; Nioradze, M; Nishiguchi, H; Numao, T; Ogitsu, T; Oishi, K; Okamura, T; Omori, C; Ota, T; Pasternak, J; Rusinov, V; Sabirov, B; Sato, A; Sato, J; Takayanagi, T; Tanaka, M; Tao, C V; Tevzadze, Y; Tolmachev, S S; Tomizawa, M; Toriashvili, T; Trekov, I; Tsamalaidze, Z; Tsverava, N; Velicheva, E; Volkov, A; Vrba, V; Abdullah, W A T Wan; Warin-Charpentier, P; Wong, M L; Xing, T Y; Yamaguchi, H; Yamanaka, M; Yoshioka, T; Zhang, J; Zhang, Y; Zuber, K
Progress of theoretical and experimental physics, 03/2020, Letnik: 2020, Številka: 3Journal Article
Abstract The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminum nucleus ($\mu$–$e$ conversion, $\mu^{-}N \rightarrow e^{-}N$); a lepton flavor-violating process. The experimental sensitivity goal for this process in the Phase-I experiment is $3.1\times10^{-15}$, or 90% upper limit of a branching ratio of $7\times 10^{-15}$, which is a factor of 100 improvement over the existing limit. The expected number of background events is 0.032. To achieve the target sensitivity and background level, the 3.2 kW 8 GeV proton beam from J-PARC will be used. Two types of detectors, CyDet and StrECAL, will be used for detecting the $\mu$–$e$ conversion events, and for measuring the beam-related background events in view of the Phase-II experiment, respectively. Results from simulation on signal and background estimations are also described.
