The TREK program at J-PARC
C. Djalali 1*
1 University of South Carolina
(on behalf of the TREK Collaboration)
The TREK collaboration is planning to carry out three experiments at J-PARC, the new high intensity proton synchrotron in Tokai, Japan. These experiments will use the new, recently commissioned kaon beamline K1.1BR in the Hadron Hall at J-PARC. A beam of low-energy positively charged kaons will be stopped, and their decays observed with a large acceptance toroidal spectrometer capable of tracking charged particles with high resolution, combined with a photon calorimeter and additional instrumentation with muon polarimeters.
The first two experiments, requiring less beam intensity, aim to test lepton universality in the Ke2/Kmu2 ratio with 0.2% statistical uncertainty, and to search for heavy sterile neutrinos in two-body kaon decays. Ultimately, the Time Reversal Experiment with Kaons (TREK) aims to find New Physics beyond the Standard Model by a precision measurement of the T-violating transverse polarization PT of muons in the K+mu3 decay of stopped kaons with a sensitivity of 10-4.
An overview of the planned experiments, results from recent R&D activities, and the current project status will be presented.
* TREK collaboration – Univ. of British Columbia, Hampton Univ., INR-Moscow, Iowa State Univ.,
KEK (Japan), Kyoto Univ., MIT, Univ. of Montreal, Nat. Def. Acad. (Japan), Nat. Sci. Univ.
(Vietnam), Osaka Univ., Univ. of Saskatchewan, Univ. of South Carolina, Thomas Jefferson National
Laboratory, Tohoku Inst. of Technology, and TRIUMF.