J-PARC October 14-15, 2005 KEK

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1 J-PARC October 14-15, 2005 KEK

2 目次ミューオン電子転換過程の紹介 MECO実験まとめ

3 GIM-like mixing! µ! e W e 3

4 SUSY-GUT Large top Yukawa couplings result in sizable off-diagonal components in a slepton mass matrix through radiative corrections, and that implies observable levels of LFV in some models of SUSY-GUT Barbieri and Hall, 1994 LFV diagram in SUSY-GUT mixing B ~ large top Yukawa coupling e e 4

5 SUSY-GUT Prediction Process Current Limit SUSY-GUT level µ N e N MEG single event sensitivity µ e γ τ µ γ MECO single event sensitivity PRSM/PRIME single event sensitivity Courtesy Hisano 5

6 SUSY with RH Majorana neutrino SUSY + See-Saw Solar Neutrino MSW Large Angle MEG single event sensitivity MECO single event sensitivity PRISM/PRIME single event sensitivity

7 (1S state) µ µ + (A, Z) ν µ + (A, Z 1) µ e νν µ (A, Z) e + (A, Z) E max = (M µ - B µ ) MeV (~105 MeV) R µe Γ(µ - N e - N) / Γ(µ - N ν µ N(Z-1)) 7

8 SUSY-GUT BR ~ Doubly Charged Higgs Boson SUSY with R-parity Violation W = λ ijk L i L j E c k + λ ijk L i Q j D c k + λ ijk U c id c jd c k - µ i L i H 2 λ 211 λ 212 < for PRISM/PRIME Faessler et al., NPB 587 (2000) Leptquarks Heavy Z M Z > (5-100) TeV for R µe ~10-16 Compositeness Multi-Higgs Models J. Bernabeu et al., NPB 409 (1993)69-86 Logarithmic enhancement in a loop diagram for µ - N e - N, not for µ e γ Λ ~ 1 PeV for PRISM/PRIME sensitivity M. Raidal and A. Santamaria, PLB 421 (1998) 250 Λ > 3000 TeV η q η q :model dependent combination of couplings, mixings, etc. 8

9 µ - N e - N vs. µ e γ µ - N e - N (MECO, PRISM/PRIME) µ e γ (MEG) Sensitive to non-photonic process B(µ e γ) = 200 B(µ - N e - N)! for photonic process µ < µ + state-of-the-art state-of-the-art 9

10 Muon Decay in Orbit E max = E LFV dn/de MDO (E LFV - E MDO ) 5 Muon Decay in Orbit Signal N bg = 0.25 for R μe = ΔE e =500 kev FWHM

11 MECO Crystal Straw Calorimeter Tracker Superconducting Detector Solenoid (2.0 T 1.0 T) Muon Stopping Target Superconducting Transport Solenoid (2.5 T 2.1 T) Superconducting Production Solenoid (5.0 T 2.5 T) 1000 (BNL-AGS) ΔE

(MC) [MHz] 25 20 15 10 5 0 Full time between proton pulses beam electrons µ decay in flight [khz] 0 400 800 1200 700 900

12 (MC) [MHz] Full time between proton pulses beam electrons µ decay in flight [khz] time with respect to proton pulse [ns] 12 0 Detection time interval µ-capture protons

13 DAQ for MECO Tracker 16 assembly x (200 straws pads) ~500kHz 10% occupancy = 2000 ch./event ~10kB/event 2~20 MB/s distributed digitization-on-site : Elefant (BaBar) ASD Shaper Gain Level Converter DAC Elefant 8x2 8 Trigger Selection 4 Digitizer Board 16k FIFO Readout Controller ROC Trigger Decision Data Transmitter & Command Receiver TXer Clock 60MHz Mother Board!! External Trigger

14 Trigger Calorimeter (trigger counter) Ee > 55 MeV MDO Eth (MeV) Trig (khz) ε (%) Data (MB/s) Strg (TB) on-line clustering Ee > 90 MeV Rate on-line farm

15 PRISM/PRIME Phase-Rotated Intense Slow Muon source - Solenoid π Capture - FFAG RING - Spiral Solenoid Spectrometer High Intensity μ±/sec High Brightness ±0.5 ~ 1.0 MeV High Purity π/μ ~ Low Energy 20 MeV (68 MeV/c) Pulsed 100 Hz

16 PRISM Large Statistics μ - High Intensity! μ ± /sec Proton from J-PARC Solenoid π Capture Good E e Resolution Thin Target High μ Stopping ε High Brightness! ±0.5 ~ 1.0 MeV Phase Rotation Suppress π b.g. High Purity! π/μ ~ 10-18

17 PRISM Components PRISM Phase Rotated Intense Slow Moun source PRIME PRISM Muon to Electron conversion experiment 5 m

Phase-Rotation!"#$%&'(#)*!+(%,#-+!).!/0'+-!1)('()1!23456789:!+#$%&'(#)* ;;42!4<<-/('*<-=!>0'+-!1)('(#)*?

18 Phase-Rotation!"#$%&'(#)*!+(%,#-+!).!/0'+-!1)('()1! :!+#$%&'(#)* D;!E!F?GH=!9FIBJK$ L3K3!M!9I?-JNOPQFP $ µ! % & 2003/5/17 NuFactJ03@!"!#$ # "!

19 PRIME PRIsm Muon-Electron conversion PRISM 100 Hz 200 ns MECO 1000 occupancy MDO

20 Spiral Solenoid Spectrometer 1 0.3B s R (p 2 l p2 t ) p l D: drift distance B: magnetic field s/r: bending angle pl: longitudial momentum pt: transverse momentum

21 Rate MDO: 0.5 ~ 4 tracks/pulse << 1kB/pulse 100kB/s 1 TB / 1yr. state-of-the-art DAQ

22 MECO DAQ Distributed on-site digitization Trig.: 1kHz, Data stream: 10 MB/s, 100 TB on-line computer farm PRISM/PRIME DAQ Trig.: 100 Hz, Data stream: 100 kb/s, 1 TB MECO PRISM/PRIME

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

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 µ COMET LFV esys clfv (Charged Lepton Flavor Violation) J-PARC µ COMET ( ) ( ) ( ) ( ) B ( ) B ( ) B ( ) B ( ) B ( ) B ( ) B 2016 J- PARC µ KEK 3 3 3 3 3 3 3 3 3 3 3 clfv clfv clfv clfv clfv clfv clfv