PANIC2011_Final
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The document summarizes the TREK experiment at J-PARC, which aims to search for physics beyond the Standard Model by measuring the transverse muon polarization (PT) in stopped K+ decays. The TREK experiment plans to use an upgraded detector from the E246 experiment along with a new fiber target and GEM tracking chambers. It expects to achieve sensitivity to PT at the 10-4 level, allowing it to probe several theories of new physics. It will take data at the K1.1BR beamline at J-PARC, which has been commissioned for stopped kaon experiments and can provide the necessary 270 kW beam power for TREK's measurements when operating at full capacity in 2014.
PANIC2011_Final
- 1. Search for Non-Standard Model Physics Using the Transverse Muon Polarization in Stopped K+ Decay The E06 TREK Experiment Sébastien Bianchin TRIUMF / University of British Columbia on behalf of the TREK-E06 Collaboration PANIC 2011 (July 24th – 29th, 2001) Massachusetts Institute of Technology, MA, USA Thursday, July 28th 2011 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 1
- 2. The TREK Program at J-PARC Outline TREK Program TREK = Time Reversal Experiment with Kaons Search for Time Reversal Symmetry Violation Test of Lepton Universality Search for Heavy Neutrinos Lower intensity Hadron Facility at J-PARC TREK Apparatus – R&D Status & Schedule S. Bianchin PANIC 2011 (July 24th – 29th 2011) 2
- 3. Stopped K+ Experiments @ K1.1BR P36 (LFU) “Measurement of RK = (K+ →e+) / (K+ →m) and search for heavy sterile neutrinos” Stage-1 (PAC11-Jan’11); 30 kW (~2013) (S. Shimizu, Parallel 5C – Meson Decays, July 28th @ 4pm) E06 (TREK) “Measurement of T-violating transverse muon polarization (PT) in K+→0mdecay” Stage-1, 270 kW (~2014) S. Bianchin PANIC 2011 (July 24th – 29th 2011) 3
- 4. Stopped K+ Experiments @ K1.1BR P36 (LFU) “Measurement of RK = (K+ →e+) / (K+ →m) and search for heavy sterile neutrinos” Stage-1 (PAC11-Jan’11); 30 kW (~2013) (S. Shimizu, Parallel 5C – Meson Decays, July 28th @ 4pm) E06 (TREK) “Measurement of T-violating transverse muon polarization (PT) in K+→0mdecay” Stage-1, 270 kW (~2014) S. Bianchin PANIC 2011 (July 24th – 29th 2011) 3
- 5. Transverse m+ Polarization in the Km3 Decay K+→mdecay PT is T-odd, and spurious effects from final state interaction are small: PT (FSI) < 10-5 Non-zero PT is a signature of T violation - Standard Model (SM) contribution to PT : PT (SM) < 10-7 PT in the range 10-3 – 10-5 is a sensitive probe of CP violation beyond the SM. There are theoretical models of new physics which allow a sizable PT value without conflicting with other experimental constraints. The TREK experiment aims for a sensitivity of 10-4 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 4
- 6. Expected Sensitivity We are aiming for a sensitivity of PT ~ 10-4 PTstat ~ 0.05 PTstat (E246) ~ 10-4 : 1.4 x 107 sec runtime 1) Beam intensity x 30 2) Detector acceptance x 10 3) Larger analyzing power PTsyst ~ 0.1 PTsyst (E246) ~ 10-4 1) Precise calibration of misalignments 2) Correction of systematic effects 3) Precise fwd-bwd cancellation S. Bianchin PANIC 2011 (July 24th – 29th 2011) 5
- 7. New Physics: Model Predictions for PT Model K+ 0m+ K+ m+ ■ Standard Model < 10-7 < 10-7 ■ Final State Interactions < 10-5 < 10-3 Multi-Higgs ≤ 10-3 ≤ 10-3 PT (K+ 0m+) ≈ + 3 PT (K+ m+) SUSY with squark mixing ≤ 10-3 ≤ 10-3 PT (K+ 0m+) ≈ − 3 PT (K+ m+) SUSY with R-parity breaking ≤ 4 x10-4 ≤ 3 x10-4 Leptoquark model ≤ 10-2 ≤ 5 x10-3 ■ Left-Right symmetric model 0 < 7x10-3 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 6
- 8. J-PARC Facility (KEK/JAEA） North S. Bianchin PANIC 2011 (July 24th – 29th 2011)
- 9. J-PARC Facility Linac (KEK/JAEA） North 3 GeV Synchrotron CY2007 Beams S. Bianchin PANIC 2011 (July 24th – 29th 2011)
- 10. J-PARC Facility Linac (KEK/JAEA） North 3 GeV Synchrotron Materials and Life Experimental Facility CY2007 Beams Hadron Exp. JFY2008 Beams Facility S. Bianchin PANIC 2011 (July 24th – 29th 2011)
- 11. J-PARC Facility Linac (KEK/JAEA） North 3 GeV Synchrotron Neutrino Beams (to Kamioka) Materials and Life Experimental Facility CY2007 Beams Hadron Exp. JFY2008 Beams Facility JFY2009 Beams S. Bianchin PANIC 2011 (July 24th – 29th 2011)
- 12. J-PARC Hadron Hall Beam Dump K1.8 KL K1.8BR K1.1 S-type 30~50 GeV Production primary beam K1.1BR target (T1) C-type S. Bianchin PANIC 2011 (July 24th – 29th 2011) 8
- 13. K1.1BR = K0.8 Beam Line Installation Proton beam S. Bianchin PANIC 2011 (July 24th – 29th 2011) 9
- 14. K1.1BR = K0.8 Beam Line Installation K1.1BR completed in summer 2010 using the supplementary budget of FY09 Commissioned in Oct. 2010 by the TREK collaboration - ESS Length of 2.0m to be increased to 2.5m - Length Q8-FF of 3.3m to be reduced to 1.5m (remove iron shielding wall) Q1, Q2 D2 T1 D1 Q3, Q4 IFX, Proton beam IFY SX1 ESS Q5, Q6 SX2 K1.1-BR SX1 MS D3 HFOC Q7 Q8 • FF S. Bianchin PANIC 2011 (July 24th – 29th 2011)
- 15. The TREK Experimental Apparatus K+→m Use an upgraded E246 detector Active Polarimeter ( Japan ) New Fibre Target ( Canada ) C0,C1 GEM ( USA ) CsI(Tl) readout ( Russia ) PT is measured as the azimuthal asymmetry Ae+ of the m+ decay positrons S. Bianchin PANIC 2011 (July 24th – 29th 2011) 10
- 16. The Stopped Beam Method K+→m Side view of the TREK setup Experimental method bwd - fwd - 0 (2) detection EM Calorimeter Decay Plane m+ tracking Target + 5 Chambers e+ detection Active Muon Polarimeter S. Bianchin PANIC 2011 (July 24th – 29th 2011) 11
- 17. The Stopped Beam Method K+→m Electromagnetic calorimeter 0 detection bwd - fwd - 768 CsI(Tl) crystals (250mm in length ea.) 12 “muon holes” @ 90º to allow m+ to enter 12 spectrometer gaps 75% of 4 str S. Bianchin PANIC 2011 (July 24th – 29th 2011) 11
- 18. The Stopped Beam Method K+→m Tracking system Charged particle tracking bwd - fwd - 5 Chambers : 1 cylindrical GEM chamber (C0) 1 planar GEM chamber (C1) + Active Target ! 3 planar MWPCs (C2, C3, C4) S. Bianchin PANIC 2011 (July 24th – 29th 2011) 11
- 19. The Stopped Beam Method K+→m e+ Active muon polarimeter m+ polarization measurement bwd - fwd - Active Muon Polarimeter Muon stopper : 33 plates (Al, Mg or other light metal alloy) Plate thickness : ~ 2mm Plate gap ~ 8mm S. Bianchin PANIC 2011 (July 24th – 29th 2011) 11
- 20. The Stopped Beam Method K+→m Double ratio experiment AT = (Afwd - Abwd ) / 2 Ncw - Nccw Afwd(bwd) = Ncw + Nccw PT = AT / {<cosT>} : analyzing power <cosT> : attenuation factor Im = PT / KF : physics parameter KF : kinematic factor bwd - fwd - S. Bianchin PANIC 2011 (July 24th – 29th 2011) 11
- 21. The Stopped Beam Method K+→m Double ratio experiment AT = (Afwd - Abwd ) / 2 Ncw - Nccw Afwd(bwd) = Ncw + Nccw PT = AT / {<cosT>} : analyzing power <cosT> : attenuation factor Im = PT / KF : physics parameter KF : kinematic factor Current limit from KEK--E246 bwd - fwd - PT = - 0.0017 ± 0.0023(stat) ± 0.0011(syst) |PT | < 0.005 (90% CL) Im= - 0.0053 ± 0.0071(stat) ± 0.0036(syst) |Im| < 0.016 (90% CL) M.Abe et al., Phys. Rev. D 73, 072005 (2006) S. Bianchin PANIC 2011 (July 24th – 29th 2011) 11
- 22. TREK/E06 Tracking Upgrade GEM technology -- In collaboration with Jefferson Lab, Hampton U. and MIT 70 µm holes 140 µm spacing Planar GEMs (C1) between CsI and C2 Cylindrical GEM (C0) as replacement for old C1 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 12
- 23. The C0 Cylindrical GEM for TREK 300 mm 160 mm 140 mm • Vertex tracking near target, < 0.1 mm • Very high rate capability > 1 kHz/mm2 • Radiation-hardness >> 107 particles/mm2 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 13
- 24. R&D(1) – APD Readout for CsI(Tl) • Improve the timing characteristics of CsI(Tl) by replacing PIN diode with APD • Pulse shaping and pile-up analysis C1 GEM One-module energy One-module timing new requirement too slow • Both 1 and 9 module tests have been performed using an e+ beam at Tohoku Univ. to check the energy resolution and high-rate performance of APD readout S. Bianchin PANIC 2011 (July 24th – 29th 2011) 14
- 25. R&D(2) – Active Muon Polarimeter Top View e+ μ+ μ+ Full angular acceptance for positrons – 10x higher than in E-246 Determination of decay vertex – background-free measurement Measurement of e+ angle and approx. energy – higher analyzing power Improved field alignment – suppressed systematic error Full-size prototype tested at TRIUMF in Nov. 2009 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 15
- 26. R&D(3) – Active Scintillating Fiber Target Light Guide: Kuraray Y11 WLS Fibre (1400 mm) 3x3 mm2 356 fibres Readout: SiPMT (Hamamatsu MMPC) 1x1 mm2 / 400 px Gain 7.5x105 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 16
- 27. Upgrade Timeline Target: Finer segmentation of TGT scintillating fibres Readout: MPPC (SiPMT) Hamamatsu Particle ID: Aerogel Cherenkov surrounding target, TOF LFU Charged particle tracking: 30 kW Add new element C1 between CsI(Tl) and C2 ~2013 Add cylindrical GEM (C0) (remove aerogel) TREK 0 (1&2 photon) detection: 270 kW New, faster readout of CsI(Tl): APD, MAPD Wave form analysis using FADCs >100 kW ~2014 Muon polarimeter : Active polarimeter with increased acceptance New muon holding field magnet with a parallel field S. Bianchin PANIC 2011 (July 24th – 29th 2011) 17
- 28. Summary TREK at J-PARC is gaining momentum “K1.1BR” secondary beamline has been commissioned Measurement of the T-violating transverse muon polarization in Kμ3 decay (~2014) - Large potential for the discovery of New Physics - Upgrade of existing experimental setup of KEK E-246 S. Bianchin PANIC 2011 (July 24th – 29th 2011) 18
- 29. The TREK Collaboration http://trek.kek.jp CANADA RUSSIA University of Saskatchewan Russian Academy of Sciences (RAS) Department of Physics and Engineering Institute for Nuclear Research (INR) University of British Columbia Department of Physics and Astronomy TRIUMF Universite de Montreal JAPAN Osaka University Laboratoire de Physique Nucleaire Department of Physics University of Manitoba National Defense Academy Department of Physics Department of Applied Physics Tohoku University USA Research Center for Electron Photon Science High Energy Accel. Research Org. (KEK) Massachusetts Inst. of Technology (MIT) Institute of Particle and Nuclear Studies University of South Carolina Institute of Material Structure Science Department of Physics and Astronomy Accelerator Laboratory Iowa State University Kyoto University, College of Liberal Arts & Sciences Department of Physics Hampton University Tokyo Institute of Technology (TiTech) Department of Physics Department of Physics Jefferson Laboratory VIETNAM University of Natural Sciences S. Bianchin PANIC 2011 (July 24th – 29th 2011) 19
- 30. The TREK Collaboration http://trek.kek.jp CANADA RUSSIA University of Saskatchewan Russian Academy of Sciences (RAS) Department of Physics and Engineering Institute for Nuclear Research (INR) University of British Columbia Department of Physics and Astronomy TRIUMF Universite de Montreal JAPAN Osaka University Laboratoire de Physique Nucleaire Department of Physics University of Manitoba National Defense Academy Department of Physics Department of Applied Physics Tohoku University USA Research Center for Electron Photon Science High Energy Accel. Research Org. (KEK) Massachusetts Inst. of Technology (MIT) Institute of Particle and Nuclear Studies University of South Carolina Institute of Material Structure Science Department of Physics and Astronomy Accelerator Laboratory Iowa State University Kyoto University, College of Liberal Arts & Sciences Department of Physics Hampton University Tokyo Institute of Technology (TiTech) Department of Physics Department of Physics Jefferson Laboratory VIETNAM New collaborators are welcome! University of Natural Sciences S. Bianchin PANIC 2011 (July 24th – 29th 2011) 19
- 31. Thank You S. Bianchin PANIC 2011 (July 24th – 29th 2011) 20
- 32. J-PARC March11 Earthquake Damage S. Bianchin PANIC 2011 (July 24th – 29th 2011)
- 33. S. Bianchin PANIC 2011 (July 24th – 29th 2011)