A large acceptance, high-resolution detector for rare K+-decay experiments

R. Appel, G. S. Atoyan, B. Bassalleck, E. Battiste, D. R. Bergman, K. Bösiger, D. N. Brown, V. Castillo, N. Cheung, S. Dhawan, H. Do, J. Egger, S. W. Eilerts, C. Felder, H. Fischer, H. M. Gach, R. Giles, S. N. Gninenko, W. D. Herold, J. E. HotmerV. V. Issakov, O. V. Karavichev, H. Kaspar, D. E. Kraus, D. M. Lazarus, V. A. Lebedev, L. Leipuner, P. Lichard, J. Lowe, J. Lozano, T. Lu, H. Ma, B. Magurno, W. Majid, W. Menzel, C. S. Miller, M. Nickelson, I. Ober, P. H. Pile, S. Pislak, A. A. Poblaguev, P. Pomianowski, V. E. Postoev, A. L. Proskurjakov, P. Rehak, P. Robmann, B. Schmid, A. Sher, Aleksey Sher, E. Shunko, S. Steiner, T. L. Stever, R. W. Stotzer, V. V. Suhov, J. A. Thompson, P. Truöl, C. Valine, H. Weyer, D. M. Wolfe, M. E. Zeller

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17 Scopus citations


The detector of the E865-collaboration at the Brookhaven-AGS described here combines a magnetic spectrometer for the charged decay products of 6 GeV/c K+ with excellent electromagnetic calorimetry and efficient particle identification for electrons and muons. Its high-resolution, large acceptance and high rate capability made it well suited for the study of extremely rare or forbidden decays with multi-leptonic final states such as K+ →π+μ+e-, K+→π+l+l-, K+→l+νle-e+ and K+→π+π-e+νe down to branching ratios below 10-11 in an intense K+ beam ( ≈ 108 per AGS spill).

Original languageEnglish
Pages (from-to)349-406
Number of pages58
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
StatePublished - Mar 1 2002


  • Charged particle identification
  • Cherenkov counters
  • Electromagnetic calorimeters
  • Magnetic spectrometers
  • Rare kaon decays


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