Pion–Muon separation with a RICH prototype for the NA62 experiment

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• 作者：B. Angelucci ; G. Anzivino ; C. Avanzini ; C. Biino ; A. Bizzeti ; F. Bucci ; A. Cassese ; P. Cenci ; R. Ciaranfi ; G. Collazuol ; V. Falaleev ; S. Galeotti ; S. Giudici ; E. Iacopini ; G. Lamanna ; M. Lenti ; G. Mag
• 关键词：RICH ; PID ; Timing
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2010
• 出版时间：1 September 2010-21 September 2010
• 年：2010
• 卷：621
• 期：1-3
• 页码：205-211
• 全文大小：734 K

文摘

The NA62 experiment at CERN, aimed to measure branching fraction (O(10⁻¹⁰)), relies on a Neon based RICH detector for π/μ separation, time measurement and level 0 trigger. The experimental requirements for this detector are: a muon contamination in pion samples lower than 5×10⁻³ in the momentum range 15–35 GeV/c and a time resolution on the charged track better than 100 ps. A prototype of such a detector was built and tested in 2009; it consists of a full length () Ne filled vessel equipped with a spherical mirror and 414 PMs on its focal plane, located about 17 m upstream of the mirror. This prototype was tested at CERN SPS on a positive hadron beam, in the required momentum range, to measure the π/μ separation and to confirm the time resolution obtained with a previous prototype; the μ misidentification probability is about 0.7 % and the time resolution is better than 100 ps in the whole momentum range.