COMET Phase-I Technical Design Report

R. Abramishvili , G. Adamov , R.R. Akhmetshin , A. Allin , J.C. Angélique (1) , V. Anishchik , M. Aoki , D. Aznabayev , I. Bagaturia , G. Ban (1) , Y. Ban , D. Bauer , D. Baygarashev , A.E. Bondar , C. Cârloganu (2) , B. Carniol (1) , T.T. Chau , J.K. Chen , S.J. Chen , Y.E. Cheung , W. da Silva (3) , P.D. Dauncey , C. Densham , G. Devidze , P. Dornan , A. Drutskoy , V. Duginov , Y. Eguchi , L.B. Epshteyn , P. Evtoukhovich , S. Fayer , G.V. Fedotovich , M. Finger , M. Finger , Y. Fujii , Y. Fukao , J.L. Gabriel (1) , P. Gay (2) , E. Gillies , D.N. Grigoriev , K. Gritsay , V.H. Hai , E. Hamada , I.H. Hashim , S. Hashimoto , O. Hayashi , T. Hayashi , T. Hiasa , Z.A. Ibrahim , Y. Igarashi , F.V. Ignatov , M. Iio , K. Ishibashi , A. Issadykov , T. Itahashi , A. Jansen , X.S. Jiang , P. Jonsson , T. Kachelhoffer (4) , V. Kalinnikov , E. Kaneva , F. Kapusta (3) , H. Katayama , K. Kawagoe , R. Kawashima , N. Kazak , V.F. Kazanin , O. Kemularia , A. Khvedelidze , M. Koike , T. Kormoll , G.A. Kozlov , A.N. Kozyrev , M. Kravchenko , B. Krikler , G. Kumsiashvili , Y. Kuno , Y. Kuriyama , Y. Kurochkin , A. Kurup , B. Lagrange , J. Lai , M.J. Lee , H.B. Li , R.P. Litchfield , W.G. Li , T. Loan , D. Lomidze , I. Lomidze , P. Loveridge , G. Macharashvili , Y. Makida , Y.J. Mao , O. Markin , Y. Matsuda , A. Melkadze , A. Melnik , T. Mibe , S. Mihara , N. Miyamoto , Y. Miyazaki , F. Mohamad Idris , K.A. Mohamed Kamal Azmi , A. Moiseenko , M. Moritsu , Y. Mori , T. Motoishi , H. Nakai , Y. Nakai , T. Nakamoto , Y. Nakamura , Y. Nakatsugawa , Y. Nakazawa , J. Nash , H. Natori , V. Niess (2) , M. Nioradze , H. Nishiguchi , K. Noguchi , T. Numao , J. O'Dell , T. Ogitsu , S. Ohta , K. Oishi , K. Okamoto , T. Okamura , K. Okinaka , C. Omori , T. Ota , J. Pasternak , A. Paulau , D. Picters , V. Ponariadov , G. Quémener (1) , A.A. Ruban , V. Rusinov , B. Sabirov , H. Sakamoto , P. Sarin , K. Sasaki , A. Sato , J. Sato , Y.K. Semertzidis , N. Shigyo , Dz. Shoukavy , M. Slunecka , D. Stöckinger , M. Sugano , T. Tachimoto , T. Takayanagi , M. Tanaka , J. Tang , C.V. Tao , A.M. Teixeira (2) , Y. Tevzadze , T. Thanh , J. Tojo , S.S. Tolmachev , M. Tomasek , M. Tomizawa , T. Toriashvili , H. Trang , I. Trekov , Z. Tsamalaidze , N. Tsverava , T. Uchida , Y. Uchida , K. Ueno , E. Velicheva , A. Volkov , V. Vrba , W.A.T. Wan Abdullah , P. Warin-Charpentier (3) , M.L. Wong , T.S. Wong , C. Wu , T.Y. Xing , H. Yamaguchi , A. Yamamoto , M. Yamanaka , T. Yamane , Y. Yang , T. Yano , W.C. Yao , B. Yeo , H. Yoshida , M. Yoshida , T. Yoshioka , Y. Yuan , Yu.V. Yudin , M.V. Zdorovets , J. Zhang , Y. Zhang , K. Zuber

1 LPCC - Laboratoire de physique corpusculaire de Caen
2 LPC - Laboratoire de Physique de Clermont
3 LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 CC-IN2P3 - Centre de Calcul de l'IN2P3

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.

Mots clés: C01 Electroweak model; Higgs bosons; electroweak symmetry breaking; C08 Tests of conservation laws; C30 Experiments using hadron beams; H10 Experimental detector systems; H50 Detector system design; construction technologies and materials; activity report; lepton: flavor: violation; muon: particle source; pi: production; beam transport; muon: yield; detector: design; electronics: readout; track data analysis; drift chamber: drift tube; numerical calculations; spatial resolution; calorimeter: electromagnetic; cosmic background radiation; trigger; data acquisition; programming; bibliography; muon- nucleus --> electron nucleus

Domaines: Instrumentations et Détecteurs [physics.ins-det]

R. Abramishvili, G. Adamov, R.R. Akhmetshin, A. Allin, J.C. Angélique, et al.. COMET Phase-I Technical Design Report. PTEP, 2020, 2020 (3), pp.033C01. ⟨10.1093/ptep/ptz125⟩. ⟨hal-01975356⟩