کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1847678 | 1033434 | 2009 | 6 صفحه PDF | دانلود رایگان |
The NA62 experiment at CERN SPS is aimed at measuring the rare decay . This poses very stringent requirements on the particle identification capabilities of the apparatus in order to reject the overwhelming K+→μ+ν and K+→π+π0 background. In particular, a π0 rejection at level of 10−8 is needed to complement the kinematical rejection of π+π0 events. In order to have a full acceptance from 0 to 50 mrad, partly covered by NA48 liquid Kripton calorimeter, a set of veto anti-counters should be placed along the vacuum decay tank, to catch large angle photons with a detection efficiency better than 10−4 in a wide energy range: from few hundreds MeV to 35 GeV. Intense R&D programs have been carried out in order to study different technological solutions: a lead-scintillating fibers calorimeter, lead-scintillator sandwich calorimeter and finally an original re-use of the existing barrel of the OPAL lead-glass electromagnetic calorimeter. We present the results on detector performances and compare the three solutions.
Journal: Nuclear Physics B - Proceedings Supplements - Volume 197, Issue 1, 15 December 2009, Pages 224-229