Author/Authors :
Angelucci، نويسنده , , B. and Anzivino، نويسنده , , G. and Avanzini، نويسنده , , C. and Biino، نويسنده , , C. and Bizzeti، نويسنده , , A. and Bucci، نويسنده , , F. and Cassese، نويسنده , , A. and Cenci، نويسنده , , P. and Ciaranfi، نويسنده , , R. and Collazuol، نويسنده , , G. and Falaleev، نويسنده , , V. and Galeotti، نويسنده , , S. and Giudici، نويسنده , , S. and Iacopini، نويسنده , , E. and Lamanna، نويسنده , , G. and Lenti، نويسنده , , M. and Magazzù، نويسنده , , G. and Marinova، نويسنده , , E.M. and Pepe، نويسنده , , M. and Piandani، نويسنده , , R. and Piccini، نويسنده , , M. and Ruggiero، نويسنده , , G. and Sergi، نويسنده , , A. and Sozzi، نويسنده , , Christie M. and Veltri، نويسنده , , M.، نويسنده ,
Abstract :
The NA62 experiment at CERN, aimed to measure K + → π + ν ν ¯ 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 ( ≈ 18 m ) 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.
