Author/Authors :
Adachi، نويسنده , , I. and Fujita، نويسنده , , K. and Fukushima، نويسنده , , T. and Gori?ek، نويسنده , , A. and Hayashi، نويسنده , , D. and Iijima، نويسنده , , T. and Ikado، نويسنده , , T. and Ishikawa، نويسنده , , T. and Kawai، نويسنده , , H. and Korpar، نويسنده , , S. and Kozakai، نويسنده , , Y. and Kri?an، نويسنده , , P. and Kuratani، نويسنده , , A. and Mazuka، نويسنده , , Y. and NAKAGAWA، نويسنده , , T. and Nishida، نويسنده , , S. and Ogawa، نويسنده , , S. and Pestotnik، نويسنده , , R. and Seki، نويسنده , , T. and Sumiyoshi، نويسنده , , T. and Tabata، نويسنده , , M. and Unno، نويسنده , , Y.، نويسنده ,
Abstract :
A proximity focusing RICH based on a silica aerogel Cherenkov radiator has been developed for a new particle identification device in the upgraded Belle detector. To further improve the detector performance, a new concept for Cherenkov ring imaging has been introduced, where multiple aerogel layers with different indices are accumulated to increase the number of detected photons without making the Cherenkov photon angle resolution worse. By constructing a prototype counter, this idea was validated in a test beam experiment, and a 5.5 σ π / K separation at 4 GeV / c with more than nine photoelectrons was achieved. We will present new results from a beam test as well as recent improvements on aerogel radiators.
Keywords :
Ring imaging Cherenkov counter , Proximity focusing , aerogel , Particle identification , Belle
