Author/Authors :
Atac، نويسنده , , M. and Charpak، نويسنده , , G. and Chipaux، نويسنده , , R. and Delbart، نويسنده , , A. and Derre، نويسنده , , J. and Giomataris، نويسنده , , Zoe Y. and Hill، نويسنده , , T. and Joseph، نويسنده , , C. and Kaplan، نويسنده , , D.M. and Kochowski، نويسنده , , C. and Leros، نويسنده , , N. and Loucatos، نويسنده , , S. and Perroud، نويسنده , , P. Rebourgeard، نويسنده , , Ph. and Rosenberg، نويسنده , , E.I.، نويسنده ,
Abstract :
New results from the tests of the impact parameter discriminator by the RD30 Collaboration are presented. The device, based on the detection of Cherenkov light produced in a thin crystal, is able to cope with extremely high rates in the GHz range and sign tracks with non-zero impact parameter at a first trigger level. We report experimental results obtained with a sapphire shell surrounded by a liquid cladding compensating chromatic dispersion. An excellent signal to background ratio has been obtained and the sensitivity at low impact parameters reaches the requirements for efficient B-meson selection. The use of such a device for hyperon selection will also be discussed.
