COMET Phase-I technical design report

• Published in: Progress of theoretical and experimental physics Vol. 2020; no. 3
• Main Authors: 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
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.03.2020; Oxford University Press on behalf of the Physical Society of Japan
• Subjects: Experiments; High energy physics; Instrumentation and Detectors; Nuclear physics; Particle physics; Physics; Science; C30; H50; C08; C01; H10; pi: production; beam transport; cosmic background radiation; lepton: flavor: violation; C08 Tests of conservation laws; C30 Experiments using hadron beams; bibliography; C01 Electroweak model; electroweak symmetry breaking; activity report; spatial resolution; data acquisition; drift chamber: drift tube; programming; numerical calculations; construction technologies and materials; muon: particle source; Higgs bosons; trigger; H10 Experimental detector systems; electronics: readout; track data analysis; H50 Detector system design; calorimeter: electromagnetic; muon: yield; detector: design; muon- nucleus > > electron nucleus
• ISSN: 2050-3911; 2050-3911
• DOI: 10.1093/ptep/ptz125

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.