The document discusses the TREK experiment at J-PARC, which aims to search for non-standard model physics using the transverse muon polarization in stopped K+ decay. It outlines the TREK program, including a search for time reversal symmetry violation and tests of lepton universality. It describes the TREK apparatus and planned upgrades, including a new active polarimeter and fibre target, which would allow the experiment to achieve sensitivity to transverse muon polarization at the 10-4 level by 2014.

1. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) Sébastien Bianchin TRIUMF / University of British Columbia on behalf of the TREK-E06 Collaboration PANIC 2011 (July 24 th – 29 th , 2001) Massachusetts Institute of Technology, MA, USA Thursday, July 28 th 2011 Search for Non-Standard Model Physics Using the Transverse Muon Polarization in Stopped K + Decay The E06 TREK Experiment

3. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) J-PARC Facility (KEK/JAEA ） North Neutrino Beams (to Kamioka) JFY2009 Beams 50 GeV Synchrotron Hadron Exp. Facility Materials and Life Experimental Facility JFY2008 Beams 3 GeV Synchrotron CY2007 Beams Linac

7. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) CANADA University of British Columbia University of Manitoba Universite de Montreal University of Saskatchewan TRIUMF USA Massachusetts Inst. of Technology (MIT) University of South Carolina Iowa State University Hampton University Jefferson Laboratory RUSSIA Russian Academy of Sciences (RAS) Institute for Nuclear Research (INR)--Moscow JAPAN Osaka University National Defense Academy Tohoku University High Energy Accelerator Research Org. (KEK) Kyoto University Tokyo Institute of Technology (TiTech) VIETNAM University of Natural Sciences TREK Collaboration New collaborators are welcome!

9. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) TREK Experimental Apparatus Use an upgraded E246 detector P T is measured as the azimuthal asymmetry A e + of the  + decay positrons Active Polarimeter ( Japan ) New Fibre Target ( Canada ) C0,C1 GEM ( USA ) CsI(Tl) readout ( Russia ) K + ->     

10. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) Stopped beam method K + ->       P T = - 0.0017 ± 0.0023( stat ) ± 0.0011( syst ) | P T | < 0.005 : 90% C.L. Im  = - 0.0053 ± 0.0071( stat ) ± 0.0036( syst ) |Im  | < 0.016 : 90% C.L . Statistical error dominates Double ratio experiment A T = ( A fwd - A bwd ) / 2 N cw - N ccw A fwd ( bwd ) = N cw + N ccw P T = A T / {<cos  T >}  : analyzing power <cos  T > : attenuation factor Im  = P T / KF : physics parameter KF : kinematic factor bwd -    fwd -    Current limit from KEK--E246

15. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) Lepton Flavour Universality N  / N e2 ~ 40,000 / 1 σ p ~ 1 MeV/c  R K /R K = 0.2% Λ eP ~ 750 TeV New Pseudoscalar Interaction -- σ t ~ 100 psec MSSM with charged-Higgs SUSY--LFV

24. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) J-PARC Mar 11 Earthquake Damage

25. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) Thank You

26. 7/8/2011 S. Bianchin PANIC 2011 (July 24 th – 29 th 2011)