COMET Satoshi MIHARA IPNS, KEK

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1 COMET Satoshi MIHARA IPNS, KEK

2 Outline clfv search experiment COMET at J-PARC Physics Goal Requirement Summary

3 clfv Search Experiments muon g-2 Neutrino Oscillation Higgs boson New Physics BSM

4 clfv Search Experiments MEG at PSI µ eγ search Belle/Babar τ clfv rare decay searches

5 Future clfv Search Experiments mu2e COMET µ-e conversion Λ (TeV) 10 4 B(µ e conv in 48 Ti)>10-18 B(µ e conv in 48 Ti)>10-16 MEG upgrade mu3e at PSI B(µ eγ)>10-13 B(µ eγ)>10-14 τ clfv decay search in Belle II 10 3 EXCLUDED κ

6 COMET

7 COMET Phase-I Collaboration R. Akhmetshin, A. Bondar, L. Epshteyn, G. Fedotovich, D. Grigoriev, V. Kazanin, A. Ryzhenenkov, D. Shemyakin, Yu. Yudin Budker Institute of Nuclear Physics (BINP), Novosibirsk, Russia Y.G. Cui, R. Palmer Department of Physics, Brookhaven National Laboratory, USA Y. Arimoto, K. Hasegawa, Y. Igarashi, M. Ikeno, S. Ishimoto, Y. Makida, S. Mihara, T. Nakamoto, H. Nishiguchi, T. Ogitsu, C. Omori, N. Saito, K. Sasaki, M. Sugano, Y. Takubo, M. Tanaka, M. Tomizawa, T. Uchida, A. Yamamoto, M. Yamanaka, M. Yoshida, Y. Yoshii, K. Yoshimura High Energy Accelerator Research Organization (KEK), Tsukuba, Japan Yu. Bagaturia Ilia State University (ISU), Tbilisi, Georgia P. Dauncey, P. Dornan, B. Krikler, A. Kurup, J. Nash, J. Pasternak, Y. Uchida Imperial College London, UK P. Sarin, S. Umasankar Indian Institute of Technology Bonbay, India Y. Iwashita Institute for Chemical Research, Kyoto University, Kyoto, Japan V.V. Thuan Institute for Nuclear Science and Technology, Vietnam H.-B. Li, C. Wu, Y. Yuan Institute of High Energy Physics (IHEP), China A. Liparteliani, N. Mosulishvili, Yu. Tevzadze, I. Trekov, N. Tsverava Institute of High Energy Physics of I.Javakhishvili State University (HEPI TSU), Tbilisi, Georgia S. Dymov, P. Evtoukhovich, V. Kalinnikov, A. Khvedelidze, A. Kulikov, G. Macharashvili, A. Moiseenko, B. Sabirov, V. Shmakova, Z. Tsmalaidze Joint Institute for Nuclear Research (JINR), Dubna, Russia M. Danilov, A. Drutskoy, V. Rusinov, E. Tarkovsky Institute for Theoretical and Experimental Physics (ITEP), Russia T. Ota Max-Planck-Institute for Physics (Werner-Heisenberg-Institute), Munchen, Germany Y. Mori, Y. Kuriyama, J.B. Lagrange Kyoto University Research Reactor Institute, Kyoto, Japan C.V. Tao College of Natural Science, National Vietnam University, Vietnam M. Aoki, T. Hiasa, I.H. Hasim T. Hayashi, Y. Hino, S. Hikida, T. Itahashi, S. Ito, Y. Kuno, T.H. Nam, H. Nakai, H. Sakamoto, A. Sato, N.D. Thong, N.M. Truong Osaka University, Osaka, Japan M. Koike, J. Sato Saitama University, Japan D. Bryman University of British Columbia, Vancouver, Canada S. Cook, R. D Arcy, A. Edmonds, M. Lancaster, M. Wing University College London, UK E. Hungerford University of Houston, USA W.A. Tajuddin University of Malaya, Malaysia R.B. Appleby, W. Bertsche, M. Gersabeck, H. Owen, C. Parkes University of Manchester, UK F. Azfar University of Oxford, UK Md. Imam Hossain University Technology Malaysia T. Numao TRIUMF, Canada 107 collaborators 25 institutes 11 countries 3

8 J-PARC Accelerator 3GeV proton Muon Neutron < 30GeV proton Muon Kaon 8

+(A,Z) e +(A,Z) µ lepton flavours changes à Muon Decay In Orbit by one unit nuclear muon

9 What is mu-e Conversion? 1s state in a muonic atom nucleus Neutrino-less muon nuclear capture (=µ-e conversion) µ +(A,Z) e +(A,Z) µ lepton flavours changes à Muon Decay In Orbit by one unit nuclear muon capture µ à e ν ν E µe ~ m µ -B µ B µ : binding energy of the 1s muonic atom µ + ( A, Z) à ν µ + (A,Z 1) B(µ N e N) = Γ (µ N à e N) à Γ ( µ N à νn ' ) 9

10 capture in the moderator (see also Fig.3.1 and the discussion in the text). Principle of Measurement Process : µ - +(A,Z) e - +(A,Z) A single mono-energetic electron Eµe(Al)~mµ-Bµ:105MeV Delayed ~1µsec No accidental background Physics backgrounds Muon Decay in Orbit (DIO) E e >102.5MeV (BR:10-14 ) E e >103.5MeV (BR:10-16 ) Beam Pion Capture π - +(A,Z) (A,Z-1) * γ+(a,z-1) γ e + e - events / 100 kev SINDRUM II BR[µ - + Au e - + Au] < run2000 on gold ETOT (MeV) SINDRUM II measurement µe2ν simulation µe simulation at B=10-11 Figure 3.3: The measured energy distribution is compared with simulated distributions for muon decay in orbit and µe conversion. No events are found above 100 MeV. 1.0 R ext = number of proton between pulses number of proton in a pulse L 1-2µs

11 Lessons Use intense pulse beam instead of DC beam Blind to prompt background using timing information Reduce pion background arriving in a delayed timing Good beam extinction factor Sensitive only high-momentum electrons emitted in a delayed timing

by SINDRUM II J-PARC high-intensity proton beam π µ 8GeV, 7µA Innovative apparatus

12 COMET Experiment Search for µ-e conv. with a sensitivity of proton Phase I world s best limit of 7x10-13 obtained by SINDRUM II J-PARC high-intensity proton beam π µ 8GeV, 7µA Innovative apparatus Pion collection Muon Transport Electron Spectrometer Staging approach Phase I: 90% C.L. sensitivity Phase II: Phase II 12

13 COMET Staging plan Phase I Construct Capture solenoid and transport line down to the 1 st 90 degree bend Detector system (with a detector solenoid) is connected at the end sensitivity with 3.2kW proton beam, 3 weeks DAQ Funding approval in JFY 2012 supplementary budget Phase I schedule after JFY2012 budget approval Superconduct ing solenoid Experiment area Beamline Detector Phase II sensitivity with 56kW proton beam (2 years DAQ) Phase II preparation will be started in parallel to Phase I DAQ. Eng. run 13

14 COMET Requirement on SC Magnet Intense Solenoid Field to collect pions/muons near the production target coils ~5T field radiation shield ~50kW beam Aluminum stabilized SC cable (Yanagi ni Kaze) Wind to Salix

from high-p line No simultaneous usage of two beam lines à Dipole

15 COMET Beam Line High-p and COMET beamline construction Share the upstream Branch from A-line using a Lambertson magnet COMET branch from high-p line No simultaneous usage of two beam lines à Dipole magnet COMET needs 8GeV proton beam 3.2kW in Phase I 56kW in Phase II 15

COMET Experiment Hall Building construction in 2013-2014 High-p beam line installation in

building construction completes Beam,Switch,Yard A&line&!&30&GeV& B&line&!

COMET&&&High2p&line&switch COMET&pion&producOon&target Secondary& Beam&lines& COMET&

16 COMET Experiment Hall Building construction in High-p beam line installation in 2014 followed by COMET beam line installation Detector installation is started when the building construction completes Beam,Switch,Yard A&line&!&30&GeV& B&line&!&8~30&GeV& T1&target&to&provide&secondary&beam B2line&branch&from&A&line COMET&&&High2p&line&switch COMET&pion&producOon&target Secondary& Beam&lines& COMET& Experiment Experimental,Hall High2p&Beam&line& COMET, Experimental,Hall High2p& Beam&Dump 750kW& Beam&Dump &COMET& Beam&dump 16

17 COMET Status Facility construction in progress SC magnet R&D and design Next presentation Detector R&D and design Accelerator R&D 8GeV operation of J-PARC MR Beam extinction study

limit) Phase II: < 10-16 SC magnet R&D and design Start

18 Summary COMET to search for mu-e conversion Phase I: < (90% C.L. limit) Phase II: < SC magnet R&D and design Start construction in JFY2013 SC wire production started Detector R&D, Accelerator R&D Facility construction started

COMET Phase-I Detector Transverse tracker

19 COMET Phase-I Detector Transverse tracker + calorimeter Same technology used in Phase II detector Beam background study Physics run smaller acceptance than the CDC design CDC + triggering counter Physics run Detector R&D and simulation work in progress 19

An Expression of Interest for Phase-I of the COMET Experiment at J-PARC

with COMET beam line An Expression of Interest for Phase-I of the COMET Experiment at J-PARC We hereby express our interest to stage the construction of the COherent Muon to Electron Transition (COMET)