Daisuke Kaneko, on behalf of the MEG(II) collaboration 26 Aug, Moscow Today and Tomorrow of the MEG...

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  • Daisuke Kaneko,on behalf of the MEG(II) collaboration26 Aug, MoscowToday and Tomorrow of the MEG experiment

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Mu E GammaLittle SM background via oscillation

    Many beyond SM theories predictSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*MEGexperimentMEGAMEG 2013PRL110, 201801(2013)E842 (g-2)PRD73(2006)072Example of MSSMLarge tan & Heavy squarkIsidori et al, Phys. Rev. D 75, 115019 (2007)Too Low to detectPossibility to detect if existprediction from new physics

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Signal and BackGroundSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICSSignal Event+e +Accidental BG+e +e+e +Radiative Decay

    eventEEe+TimeAnglenoteSignal52.8 MeV52.8 MeVTe = T180Acc BG

  • Today :

    MEG I experimentSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • MEG at Paul Scherrer InstituteThe worlds most intense beam108 /s @ E5 lineDC currentAdvantage to avoid accidental pile upSurface muonSmall momentum spreadSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*590 MeV, 2.2 mA, 1.3 MW, 50.6 MHzPSI SS proton ring cyclotron60 researchers from 5 countriesSINDRUM experiment(-e conv.) was done in the same place

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • MEG I instrumentsSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*Liquid xenon-ray detectorTiming counterCOBRA magnet withGradient B fieldLow-massDrift chamber+ stoppingtarget

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • MEG I stepsSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*2008 :First physics data taking

    2010 :Result with 2008 dataS = 1.3 x 10-11, UL = 2.8 x 10-11 (90% CL)

    2011 : surpassed previous experimentResult with 2009+2010 dataS = 1.6 x 10-12, UL = 2.4 x 10-12 (90% CL)

    2013 : current world recordCombined result 2009-2011S = 7.7 x 10-13, UL = 5.7 x 10-13 (90% CL)

    Phys. Rev. Lett. 107, 171801Phys. Rev. Lett. 110, 201801Integrated statistical amount2013 :Finished data acquisition

    2015 :final result of MEG I (expected)Nucl. Phys. B, 834 12221 / Single Event Sensitivity (10-12)Blindeddatasensitivityupper limit

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Analysis of MEG dataSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*Best fit Nsig is estimated by likelihood fitting on analysis region.Confidence region is set by a frequentist method with a profile likelihood-ratio orderingThe analysis region is blinded until the PDFs for the likelihood analysis are finalized.The PDFs are extracted from side-band data or calibration data.from MEG 2013 resultAnalysisregion Timeside band Timeside band Eside band te[ns]E[MeV]Constraints of NBG and NRD estimated from the sideband datasignalcontour11.642

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • MEG I final resultSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*In final MEG analysis, data amount is doubled.

    In addition, analysis has been improved since previous analysis for 2013 result.Reduction of BG- from annihilation in flight of positronWhen BG is generated by annihilation in tracker. It can be tagged by checking disappearing e+ track and hit point.Positron missing turn recoveryImprove the efficiency to connect track-segments of multiple turn e+ tracks, In a case where e+ turns more than once, if 1st and 2nd turn wereidentified separately. A wrong vertex can be reconstructed.Target alignment with 3D scannerIn 2012 and 2013 data, deformation of target was found.It is taken into account in vertex reconstruction and the systematic error is included the likelihood function.MEG I final result comes soon !

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Tomorrow :

    MEG II experimentSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • MEG II concept10 times better sensitivity, BO(10-14) !

    Keep basic concept of experimentupgrade with low cost, in short term

    Use full potential of PSI beam lineHigher + intensity, 2-3

    Improve detector performanceOverall efficiency 2Resolution /2 for all E, Ee , te, e and eSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Over view of the detector upgradesSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*thinnertargetadditionaldetectorRDCLiquid xenonread out with SiPMUnified volumeStereo wiredDrift chamberPixelatedTiming counter

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Upgraded detectorSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*Lesson from MEG I :Improve uniformity of light collection especially when ray converts near inner wall.The energy and position resolutions will be greatly improved.

    detection efficiency increases by 10%,thanks to low-mass of MPPC.

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • LXe MPPCSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*New sensor has been developed in collaboration with Hamamatsu2-inch PMTNormal MPPC (3x3 mm2)VUV MPPC (12x12 mm2)>15% PDE for LXe scintillation light (175nm).

    Four 6x6 mm2 chips are connected in series, in order to reduce sensor capacitance (, and thereby to get sharper signal).

    A technology to suppress crosstalk is applied to the final version

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Status of -detector upgradeSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*We performed prototype test with 600 MPPCs in Liquid Xenon.

    Operation of MPPC, cable, connector, feedthrough etc.were confirmed.

    Now, ~4000 pcs of final version MPPCs are being produced, and tested.

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • New Drift chamberSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*Lesson from MEG I :Many positrons were lost by hitting structure atthe end of the drift chamber.Positron reconstruction efficiency40% 90%

    Single volumeStereo wired

    single hit resolution 0.1mmmore detect points by finer cell

    Angular resolution of e+ emission 9mrad 5mradMomentum resolution350 keV 130 keV

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Status of new Drift chamberSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS* Test of resolution and ageing with prototypes were already finished. Full-scale and partially wired mockup chamber was made tested in engineering run

    Production of front-end electronics startedWiring machineMockup delivered

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • New Timing counterSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*MEG I TC : As much photoelectrons with large scintillator (PMT readout)MEG II TC : Hit time measurement with multiple hits in segmented timing counter (SiPM readout)High rate tolerance, better timing resolution 30ps Single Counter6 series SiPMs (AdvanSiD) on both side12cm4/5cmt 5mm

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Status of new TCSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*Beam test was performed to demonstrate multi-hit scheme e+Prototype CountersBeam test in PSI E5 areaBeam test resultCurrently mass-production is underway.

    1/4 of full detector will be tested in engineering run at end of this year.Expected timing resolution is obtainedaverage Nhitresolution of single detector is worse due to the performance of SiPMExpectation from single resolutionRC AnalysisOddEven AnalysisRC Analysis with hit selectionReference Counters

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • New Detector to reduce BGSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*Low energy positronDown-stream RDCplastic scintillator + LYSOUp-stream RDCscintillation fiberUnderConstructionneeds studyabout beamdisturbanceRadiativeDecayCounter

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Developments in ElectronicsSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*WaveDREAM

    An integrated board withAnalog amplifierHV supplyWaveform digitizer (DRS4)1st level trigger16 channels in a board, 16 boards in a crate(3U),The first crate will be available in this autumn.The number of readout channels will increase by more than factor 2.

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

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    LXe

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    TC

    AUX

    Sheet1

    LXeDCTCAUX

    MEG-I850173012030

    MEG-II472027601024100

  • MEG II ProspectsSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*After 3 years of data taking,Expected sensitivity is 4-5 x10-14

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • ScheduleSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*201520162017Accelerator ONAccelerator OFFAccelerator ONAccelerator OFFconstructionEngineeringrun preparationbeamDAQInstallationCalibrationBeam tuningCalibrationTest DAQStart MEG II physics runwhen we will get ready

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • ConclusionSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Thank you for your listening

  • MEG beam lineSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*-eSeparatorBeam Transportation Solenoid

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • gradient B fieldSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*e+ quickly swept out.Bending radius depends on emission angle on ly little.

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • Positron AIFSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*AIF ObservablesAIF, AIF, tAIF :Comparison of e+ & RAIF, ZAIF, AIF :Where AIF occurred

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • missing turnSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*1st trun2nd trunwrong vertextrue vertex

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • BG SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • PDE of LXe MPPCSEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*crosstalk suppressionapplied

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

  • SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS*

    SEVENTEENTH LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS

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