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. Hotmer,V.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

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2002）

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Abstract

The detector of the E865-collaboration at the Brookhaven-AGS described here combines a magnetic spectrometer for the charged decay products of 6GeV/cK+ 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).

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Key words

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

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