Μ粒子電子転換事象探索実験による世界最高感度での荷電LFV探索第3回機構シンポジューム 2009年5月11日素粒子原子核研究所　三原　智

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1 µ COMET LFV esys

2 clfv (Charged Lepton Flavor Violation) J-PARC µ COMET

4 ( )

5 ( )

6 ( )

7 ( ) B

8 ( ) B

9 ( ) B

10 ( ) B

11 ( ) B

12 ( ) B

13 ( ) B

14 2016 J- PARC µ KEK

16 3

17 3 3

18 3 3

19 3 3

20 3 3

21 3 3

22 clfv

23 clfv

24 clfv

25 clfv

26 clfv

27 clfv

28 clfv

29 clfv

30 clfv

31 clfv SM µ - e - ν µ ν e L µ ΔL µ =0 L e ΔL e =0 µ - A e - A L µ ΔL µ =-1 L e ΔL e =+1 vs µ

32 clfv SM ν µ µ - e - ν µ ν e m ixin g L µ 1 0 ν1 0 ΔL µ =0 L e e 1 ΔL e =0 µ e µ - A e - A W (m ν /m W ) 4 L µ ΔL µ =-1 L e ΔL e =+1 Very Small (10-52 ) vs µ

33 clfv GUT LFV

34 @ Planck mass scale SUSY-GUT Yukawa interaction SUSY Seesaw Model Neutrino Yukawa interaction CKM matrix LFV Neutrino oscillation L.J.Hall,V.Kostelecky,S.Raby,1986;A.Masiero, F.Borzumati, 1986

35 clfv LHC Masiero et al. JHEP03

36 LHC clvf LHC+cLFV LHC clfv LHC clfv LHC clfv TeV LHC LHC+cLFV LHC upgrade, ILC

37 clfv g-2 Hep-ph/ v2 S.Antusch et al This Experiment

38 clfv g-2 hep-ph/ v2 G.Isidori et al Hep-ph/ v2 S.Antusch et al δ 12 LL = 10 4 and δ 23 LL = GeV M~ 600 GeV This Experiment 200 GeV M GeV 500 GeV µ 1000 GeV 10 tan β 50 A U = 1 TeV M q = 1.5 TeV. and the GUT relations The red areas correspond to points within the funnel region which satisfy the B- physics constraints listed

39 clfv g-2 ~10 hep-ph/ v2 G.Isidori et al Hep-ph/ v2 S.Antusch et al δ 12 LL = 10 4 and δ 23 LL = GeV M~ 600 GeV Current Bound This Experiment This Experiment 200 GeV M GeV 500 GeV µ 1000 GeV 10 tan β 50 A U = 1 TeV M q = 1.5 TeV. and the GUT relations The red areas correspond to points within the funnel region which satisfy the B- physics constraints listed 0.002

Muon clfv MEGA SINDRUM II MEG Los Alamos µ

40 Muon clfv MEGA SINDRUM II MEG Los Alamos µ eγ PSI µ-e conversion PSI µ eγ RUNNING! µ (28MeV/c) ( )µ ( 52MeV/c) µ 28MeV/c 4 x 10 7 s -1 ~10 7 s -1 3 x 10 7 s PRD 65, EPJ C (2006) (Au )7 x NP B834 (2010) x 10-11

41 µ eγ µ-e conversion

42 µ eγ µ-e conversion µ eγ µ-e conv

43 µ eγ µ-e conversion µ eγ µ-e conv µ eγ µ-e conv Loop vs Tree LHC

44 µ eγ µ-e conversion µ eγ µ-e conv µ eγ µ-e conv Loop vs Tree LHC

45 µ eγ µ-e conversion Z Z µ eγ µ-e conv µ eγ µ-e conv Loop vs Tree LHC

46 µ-e conversion µ eγ µ eγ µ eγ µ-e conversion

47 µ-e conversion µ eγ µ eγ µ eγ µ-e conversion ν µ ν e? γ

48 µ-e conversion µ eγ µ eγ µ eγ µ-e conversion µ-e conversion µ

49 µ 1s Neutrino-less muon nuclear capture (=µ-e conversion) µ - + (A, Z) e - + (A,Z) µ muon decay in orbit µ e ν ν nuclear muon capture µ + ( A, Z) ν µ + ( A, Z 1) B(µ - N e - N) = Γ (µ - N e - N ) Γ ( µ - N ν N ' )

50 µ E µe ~ m µ -B µ m µ : µ B µ : 1s R.Kitano, M.Koike, Y.Okada P.R. D66, (2002)

Mu2e @ FNAL FNAL Mu2e Experiment CD-0 Tevatron Accumulator Ring

51 FNAL FNAL Mu2e Experiment CD-0 Tevatron Accumulator Ring Debuncher Ring C. Bhat and M. Syphers Mu2e Acc WG meeting Mar 9,

52 COMET J-PARC E21

53 COMET J-PARC p π µ 8GeV, ~7µA 56kW µ π µ J-PARC PAC J-PARC PAC -1 µ /

54 π π - +(A,Z) (A,Z-1)* γ + (A,Z-1) γ e + e -

55 π π - +(A,Z) (A,Z-1)* γ + (A,Z-1) γ e + e - π µν µ-e conv 0.88µs µ

56 π π - +(A,Z) (A,Z-1)* γ + (A,Z-1) γ e + e -

57 π π - +(A,Z) (A,Z-1)* γ + (A,Z-1) γ e + e -

58 µ 100nsec, ~1µsec - 8GeV µs (584ns x 2) ns 0.7 second beam spill 1.5 second accelerator cycle N bg = NP x R ext x R π-stop/p x A π x P RPC x P γ-e x A NP : total # of protons (~10 21 ) R ext : Extinction Ratio (10-9 ) R π-stop/p : π stop yield per proton (3.5 x 10-7 ) R RPC : Probability of γ from π (0.2) P γ-e : Probability of e from γ A : detector acceptance 1.4x10-5 BR=10-16, N bg ~ 0.1 Extinction < 10-9

59 COMET RCS: h=2 1 MR:h=8(9) 4(3) RF ON 8GeV 1.6 x ppb, 7µA, 56kW Linac RCS

60 COMET RCS: h=2 1 MR:h=8(9) 4(3) RF ON 8GeV 1.6 x ppb, 7µA, 56kW Linac RCS

61 COMET RCS: h=2 1 MR:h=8(9) 4(3) RF ON 8GeV 1.6 x ppb, 7µA, 56kW Linac RCS

62 π π µ π Mars and PHITS

63 µ π µ µ Guide π s until decay to µ s Suppress high-p particles µ s : p µ < 75 MeV/c e s : pe < 100 MeV/c Beam Blocker See Classical Electrodynamics, J.D.Jackson Ch.12-Sec.4 Beam collimator

64 µ π µ µ Guide π s until decay to µ s Suppress high-p particles µ s : p µ < 75 MeV/c e s : pe < 100 MeV/c Beam Blocker See Classical Electrodynamics, J.D.Jackson Ch.12-Sec.4 Beam collimator

65 COMET ~100MeV µ µ

66 60-MeV/c DIO electrons µ : τ µ - = 0.88 µs 66 µ rejection ~10-6 : < 10kHz 20% 105-MeV/c µ-e electron

67 JPNC

68 2x10 7 sec Single event sensitivity N µ µ µ 2.0x10 18 fcap, µ 0.6 Ae total protons muon yield per proton muon stopping efficiency 8.5x # of stopped muons 2.0x10 18 Single event sensitivity 90% C.L. upper limit 2.6 x x 10-17

69 2x10 7 sec Background Events Comments Radiative Pion Capture 0.05 Beam Electrons <0.1 MC stat limited Muon Decay in Flight < Pion Decay in Flight < Neutron Induced For high E n Delayed-Pion Radiative Capture Anti-proton Induced For 8 GeV p Muon Decay in Orbit 0.15 Radiative Muon Capture <0.001 Muon Capture with n Emission <0.001 Muon Capture with Charged Part. Emission <0.001 Cosmic-Ray Muons Electrons from Cosmic-Ray Muons Total 0.34

2x10 7 sec Background Events Comments Radiative Pion Capture 0.05 Beam Electrons <0.1 MC stat limited Muon Decay in Flight <0.0002 Pion Decay in Flight <0.0001 Neutron Induced 0.

70 2x10 7 sec Background Events Comments Radiative Pion Capture 0.05 Beam Electrons <0.1 MC stat limited Muon Decay in Flight < Pion Decay in Flight < Neutron Induced For high E n Delayed-Pion Radiative Capture Anti-proton Induced For 8 GeV p Muon Decay in Orbit 0.15 Radiative Muon Capture <0.001 Muon Capture with n Emission <0.001 Muon Capture with Charged Part. Emission <0.001 Cosmic-Ray Muons Electrons from Cosmic-Ray Muons Total 0.34 < 10-9

72 π W

73 CDR TDR π µ

74 2016 J-PARC µ KEK J-PARC clfv COMET KEK