Prospects for CLFV experimentsSatoshi MIHARAKEK, Japan

CLFV and Related ProgramsLHC: SUSY Search Bs +-, Bs , PSI/MEG: BR( e ) < 10-13 eee in futureKEKB: e() , e() ...BR < 10-8BNL: g-2 < 0.5 ppm>3- off from SMFNAL: BR(- N e- N) < 10-16FNAL: g-2 < 0.1 ppmJ-PARC: g-2 < 0.1 ppmJ-PARC: EDMJ-PARC: BR(- N e- N) < 10-14 , 10-16PSI: EDMTRIUMF: PIENUJ-PARC: Ke2/K2

OutlineIntroductionMEGCOMET, Mu2e and other ExperimentsSummary

oscillation and cLFVcLFV searches play a key role to understand the origin of neutrino massScale of neutrino mass generation

Scale of EW Symmetry breaking (TeV)Verification of new physics existence

MEGRecent Result

Donato Nicols talk Today afternoon WG4

MEG Result before this Summer2008 data

MEG DetectorBeam Transport System - PSI PiE5 beam line 3107 /secLiquid Xenon Gamma-ray DetectorPositron Spectrometer

Analysis UpdateAfter ICHEP 2010 presentationMore work on the major systematicsAlignments (DC-B-target-LXe)B field reconstruction refinement using measured BzDetailed implementation of positron observable correlationsData analysis cross checkTwo likelihood analysis implementation

LikelihoodBR < 9.610-12(90% C.L.)Normalization 1.110-128% for null signalBR < 1.710-12(90% C.L.)Normalization 2.210-1220092010

2009 & 2010 Combined ResultSystematic error (total 2.2%) includedData fitted 100 times, with changing PDF using its uncertaintyRMS of the unconstrained best fit and the UL is calculatedMore data in 2011 and 2012Detector upgrade under discussion

DataBfitLLUL20093.2 10-121.7 10-139.6 10-122010-9.9 10-13-1.7 10-122009+2010-1.5 10-13-2.4 10-12

Future Experiments

What is mu-e Conversion ?1s state in a muonic atomNeutrino-less muonnuclear capture (=-e conversion)nucleus+(A,Z)+(A,Z1)nuclear muon capture muon decay in orbit lepton flavours changes by one unitEe ~ m-BB: binding energy of the 1s muonic atom

SUSY-GUT, SUSY-seesaw (Gauge Mediated process)BR = 10-14 = BR(e) O()lSUSY-seesaw (Higgs Mediated process)BR = 10-12~10-15lDoubly Charged Higgs Boson (LRS etc.)Logarithmic enhancement in a loop diagram for -N e-N, not for e M. Raidal and A. Santamaria, PLB 421 (1998) 250and many othersTheoretical ModelsAndre de Gouvea, W. Molzon, Project-X WS (2008)

mu-e & g-2G. Ishidori et al., PRD 75 (2007) 115019Recent Upper LimitsSINDRUM-II: BR[- + Au e- + Au] < 7 10-13SINDRUM-II: BR[- + Ti e- + Ti] < 4.3 10-12TRIUMF: BR[- + Ti e- + Ti] < 4.6 10-120.50.40.30.20.1BR(e;Ti)1013B physics constraintmuon g-2a: off by 3.3

e (MEG)2009-2010 BR < 2.4 10-12 (90%C.L.)

Principle of MeasurementSINDRUM IIProcess : - +(A,Z) e- +(A,Z)A single mono-energetic electronEe ~ m-B :105 MeVDelayed~1S

No accidental backgroundsPhysics backgroundsMuon Decay in Orbit (DIO)Ee > 102.5 MeV (BR:10-14)Ee > 103.5 MeV (BR:10-16)Beam Pion Capture-+(A,Z) (A,Z-1)* +(A,Z-1) e+ e-BR[- + Au e- + Au] < 7 10-131-2sRext=number of proton between pulsesnumber of proton in a pulse

mu-e conversion searchMu2e at FNAL

COMET at J-PARCMELC experiment at Moscow Meson Factory

Mu2e Experiment at FNALTarget S.E.S. 210-17uses the antiproton accumulator/debuncher rings to manipulate proton beam bunchesNo interference with NOvA experimentMu2e uses beam NOvA cantpion production target in a solenoid magnetS-shape muon transport to eliminate BG and sign-selectTracker and calorimeter to measure electronsR. Bernstein WG4 Monday

Mu2e R&D StatusSolenoid system designAdvanced modeling of the primary beamcivil and building design as wellDetector R&DStraw tracker in vacuum

DOE CD-1 this autumnCD-2/3a about a year later

COMET Experiment at J-PARCTarget S.E.S. 2.610-17Pulsed proton beam at J-PARCInsert empty buckets for necessary pulse-pulse widthbunched-slow extractionpion production target in a solenoid magnetMuon transport & electron momentum analysis using C-shape solenoidssmaller detector hit rateneed compensating vertical fieldTracker and calorimeter to measure electronsR. DArcy WG4 Monday

COMET R&D Statusproton beamProton beam study (Extinction Measurement)Measurement at MR abort line (Fast Extraction) and Secondary beam line (Slow Extraction)Both provided consistent resultExtinction: (5.4 0.6)10-7Further improvement expected (O(10-6)) by double injection kickingExternal extinction device improves even more (O(10-3))US-Japan cooperative research program

COMET R&D Statuspion capture solenoidIntensive studies of SC wire and solenoid magnetIrradiation test of SC wire at Kyoto Univ. research reactorDeterioration after irradiation and recovery after thermal cycle confirmedM. Yoshida WG3&4 ThursdayS. Cook WG3&4 Thursday

Comparison between Mu2e and COMET

Mu2eCOMETProton Beam8GeV, 20kWbunch-bunch spacing 1.69 secrebunchingExtinction: < 10-108GeV, 50kWbunch-bunch spacing 1.18-1.76 secempty bucketsExtinction: < 10-9Muon TransportS-shape SolenoidC-shape solenoidDetectorStraight Solenoid with gradient fieldTracker and CalorimeterC-shape Solenoid with gradient fieldTracker and CalorimeterSensitivitySES: 210-1790% CL UL: 610-17SES: 2.610-1790% CL UL: 610-17

Other cLFV ExperimentsDeeMeAnother mu-e conversion search proposal at J-PARCeee search plan at PSIcLFV search using lepton at Belle/Belle II

DeeMe at J-PARCmu-e conversion search at J-PARC with a S.E.S. of 10-14Primary proton beam from RCS3GeV, 1MWPion production target as a muon stopping targetBeam line as a spectrometerKicker magnets to remove prompt backgroundMulti-purpose beam line for DeeMe, HFS, g-2/EDM is under constructionDIO BGSignalPrompt BGSM WG4 Tuesday

eee searchPlan to search for eee using PSI muon beamSINDRUM limit in 1988 1.010-12Thin pixel silicon tracker and scintillating fiber timing counterLoI planned in 2011N. Berger WG4 Tuesday

cLFV search using leptonK. Hayasaka WG4 Tuesday

SummarycLFV search activities in the worldMEG improved the limit of e2.4 10-12 at 90% C.L.Further improvement expectedCOMET, DeeMe and Mu2eintensive R&D for realization of experiments LFV at Belle, eee at PSI