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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- ひろみ わしあし
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1 µ COMET LFV esys
2 clfv (Charged Lepton Flavor Violation) J-PARC µ COMET
3
4 ( )
5 ( )
6 ( )
7 ( ) B
8 ( ) B
9 ( ) B
10 ( ) B
11 ( ) B
12 ( ) B
13 ( ) B
14 2016 J- PARC µ KEK
15
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
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)
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
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
71
72 π W
73 CDR TDR π µ
74 2016 J-PARC µ KEK J-PARC clfv COMET KEK
cm λ λ = h/p p ( ) λ = cm E pc [ev] 2.2 quark lepton u d c s t b e 1 3e electric charge e color charge red blue green qq
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2007 2007 7 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 1 2007 2 4 5 6 6 2 2.1 1: KEK Web page 1 1 1 10 16 cm λ λ = h/p p ( ) λ = 10 16 cm E pc [ev] 2.2 quark lepton 2 2.2.1 u d c s t b + 2 3 e 1 3e electric charge
W 1983 W ± Z cm 10 cm 50 MeV TAC - ADC ADC [ (µs)] = [] (2.08 ± 0.36) 10 6 s 3 χ µ + µ 8 = (1.20 ± 0.1) 10 5 (Ge
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22 2 24 W 1983 W ± Z 0 3 10 cm 10 cm 50 MeV TAC - ADC 65000 18 ADC [ (µs)] = 0.0207[] 0.0151 (2.08 ± 0.36) 10 6 s 3 χ 2 2 1 20 µ + µ 8 = (1.20 ± 0.1) 10 5 (GeV) 2 G µ ( hc) 3 1 1 7 1.1.............................
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