Apparatus for a search for T-violating muon polarization in stopped-kaon decays

J. A. Macdonald, M. Abe, M. Aoki, I. Arai, Y. Asano, T. Baker, M. Blecher, M. D. Chapman, P. Depommier, P. Gumplinger, M. Hasinoff, R. Henderson, K. Horie, Y. Igarashi, T. Ikeda, J. Imazato, A. P. Ivashkin, A. Kaga, J. H. Kang, M. M. KhabibullinA. N. Khotjantsev, E. J. Kim, K. U. Kim, Y. G. Kudenko, Y. Kuno, J. M. Lee, K. S. Lee, G. Y. Lim, D. R. Marlow, C. R. Mindas, O. V. Mineev, C. Rangacharyulu, S. Sekikawa, K. Shibata, H. M. Shimizu, S. Shimizu, Y. M. Shin, Y. H. Shin, K. S. Sim, A. Suzuki, T. Tashiro, A. Watanabe, D. Wright, C. H. Yim, T. Yokoi

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


The detector built at KEK to search for T-violating transverse muon polarization in K+→π0μ+νμ(K μ3) decay of stopped kaons is described. Sensitivity to the transverse polarization component is obtained from reconstruction of the decay plane by tracking the μ+ through a toroidal spectrometer and detecting the π0 in a segmented CsI(Tl) photon calorimeter. The muon polarization was obtained from the decay positron asymmetry of muons stopped in a polarimeter. The detector included features which minimized systematic errors while maintaining high acceptance.

Original languageEnglish (US)
Pages (from-to)60-91
Number of pages32
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
StatePublished - Jun 21 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


  • CsI(Tl) photon detector
  • K Decays
  • Muon polarimeter
  • Scintillation fiber target
  • Separated stopped K beams
  • T-violation
  • Toroidal spectrometer
  • Transverse muon polarization


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