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The Time Reversal Experiment with Kaons (TREK) at J-PARC

Hampton University, Hampton, VA, USA & Jefferson Lab, Newport News, VA, USA. The Time Reversal Experiment with Kaons (TREK) at J-PARC. OLYMPUS Collaboration Meeting, DESY, April 6-7, 2009. Michael Kohl <kohlm@jlab.org>. TREK/E06. T ime R eversal violation E xperiment with K aons:

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The Time Reversal Experiment with Kaons (TREK) at J-PARC

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  1. Hampton University, Hampton, VA, USA &Jefferson Lab, Newport News, VA, USA The Time Reversal Experimentwith Kaons (TREK) at J-PARC OLYMPUS Collaboration Meeting, DESY, April 6-7, 2009 Michael Kohl <kohlm@jlab.org>

  2. TREK/E06 Time Reversal violation Experiment with Kaons: Search for New Physics beyond the Standard Model by Measurement of T-violating Transverse Muon Polarization in K+ μ+π0 νμ Decays New official website: http://trek.kek.jp

  3. 20 Institutions from 6 Countries CANADA University of Saskatchewan Department of Physics and Engineering University of British Columbia Department of Physics and Astronomy TRIUMF Universite de Montreal Laboratoire de Physique Nucleaire USA Massachusetts Institute of Technology (MIT) Laboratory for Nucl. Science & Bates Lin. Acc. Center University of South Carolina Department of Physics and Astronomy Iowa State University College of Liberal Arts & Sciences Hampton University Department of Physics Jefferson Laboratory RUSSIA Russian Academy of Sciences (RAS) InstituteforNuclearResearch(INR) JAPAN Osaka University Department of Physics National Defense Academy Department of Applied Physics Tohoku University Laboratory of Nuclear Science High Energy Accel. Research Org. (KEK) Institute of Particle and Nuclear Studies Institute of Material Structure Science Accelerator Laboratory Kyoto University, Department of Physics Tokyo Institute of Technology (TiTech) Department of Physics VIETNAM University of Natural Sciences THAILAND Kasetsart University

  4. TREK/E06 90%CL. 90%CL.

  5. Transverse muon polarization • K+ ➙π0μ+ν • Decay at rest • T-odd correlation PT≠0 ⇒ T violation (CPT theorem) ⇒ CP violation M. Abe et al., PRL83 (1999) 4253 M. Abe et al., PRL93 (2004) 131601 M. Abe et al., PRD72 (2006) 072005 KEK-E246: PT = - 0.0017 ± 0.0023(stat) ± 0.0011(sys)‏ ( |PT| < 0.0050 : 90% C.L. )‏

  6. KEK-PS E246 experiment: K+→π0μ+ν (Kμ3) • Stopped K+ decay at K5 • Superconducting Toroidal Spectrometer

  7. E246: Superconducting toroidal magnet

  8. E246: Active target and CsI calorimeter • 768 CsI crystals, 75%4 sr • 12 muon gaps • 20 cm active length • 6 mm ring counters • 25 cm length • PIN diode readout • 9 cm diameter • 256 fibers 5x5 mm2

  9. New proposal of PT (K3) at J-PARC Time Reversal Experimentwith Kaons • TREK/E06:Upgrade of E246 setup • Reduce systematic errors by factor ~>10 • alignment with data • correction of systematics • Decrease statistical error by factor ~>20 • 20x higher K+ intensity at J-PARC • 10x larger polarimeter acceptance • >1.6x higher polarimeter sensitivity 10-4 10-4

  10. Upgrade proposal • Charged tracking: • Addition of a new element C1 between C2 and TGT/RNG • Replacement of previous C1 chamber by cylindrical GEM • Finer segmentation of TGT fiber; use of helium bagsReadout: MPPC (SiPMT) or MA-PMT • π0 detection: • New, faster readout of CsI(Tl): APD, MAPD • Operation of wave form analysis by FADC • Muon polarimeter : • Active polarimeter • New magnet with a parallel field

  11. Active fiber target: Baseline design c.f. E246 Ring counters PSI FAST target One element 70 – 150 cm Cross section • Light guide : • Bicron 692 WLS or • Kuraray Y11 WLS or • Clear optical fiber • Readout: • SiPMT (HPK MPPC) or • MA-PMT • Estimated hits in the photon sensor: • ~ 7 x107 particles/year 3 x 3 mm 492 fibers Timing counters

  12. Active Muon Polarimeter • 10 times more acceptance • Full angular acceptance for positrons • Improved field alignment

  13. TREK/E06 Tracking Upgrade 70 µm 140 µm GEM technology: In collaboration with Hampton U., MIT, and Jefferson Lab • Planar GEMs (C1) between CsI and C2 • Cylindrical GEM (C0)‏ in replacement of former C1

  14. 300 mm 160 mm 140 mm C0 Cylindrical GEM for TREK • Vertex tracking near target, δ < 0.1 mm • Very high rate capability 25 kHz/mm2 (COMPASS) • Radiation-hardness 4 x1010 MIPs/mm2 (COMPASS) • TREK: Rates <250 Hz/mm2 (halo <5 Hz/mm2), total dose: 7 x107 particles

  15. Tracking upgrade: Geant4 GOALS: • Realistic geometry of upgraded TREK apparatus • Realistic tracking performance Obtain design criteria for • Sizes and locations of new elements • Intrinsic resolutions for C0 and C1 • Angular and spatial resolution of tracks • Optimization of material budget Geant4 studies initiatedin summer 2008 Target/C0 C1 C2

  16. Location of J-PARC

  17. Shin'ya Sawada @ TREK Meeting, KEK ＬＩＮＡＣ RCS n ＭＬＳＦ 50GeV-PS Hd Bird’s eye photo in Nov. 2006

  18. Hadron Experimental Hall Beam Dump K1.8 KL K1.8BR • Production • target (T1)‏ K1.1 S-type K0.8 C-type 30~50 GeV primary beam T1 target

  19. Timeline • Feb 2005: New collaboration formed (Japan, Canada, USA, Russia and Vietnam) • April 2006: Proposal submission • July 2006: Review by PAC → “stage-1” (scientific) approval • Feb 2009: First beam in Hadron Facility • 2007-2009: R&D and experiment design phase • J-PARC PS and HF start operating • 2010-2011: Kaon 0.8 beamline, experiment upgrade and commissioning • 2011-2012: Start of experiment (1 year)‏ • 2012-2013: Analysisandresults

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