Author/Authors :
Barichello، نويسنده , , G and Cervera-Villanueva، نويسنده , , A and Daniels، نويسنده , , D.C and do Couto e Silva، نويسنده , , E and Ellis، نويسنده , , M and Ferrère، نويسنده , , D and G?mez-Cadenas، نويسنده , , J.J and G?ssling، نويسنده , , C and Gouanère، نويسنده , , M and Hernando، نويسنده , , J.A. and Huta، نويسنده , , W and Kokkonen، نويسنده , , J and Kuznetsov، نويسنده , , V.E. and Linssen، نويسنده , , L and Lisowski، نويسنده , , B and Long، نويسنده , , J and Lupi، نويسنده , , A and Runolfsson، نويسنده , , ? and Schmidt، نويسنده , , B and Soler، نويسنده , , F.J.P. and Steele، نويسنده , , D and Stip?evi?، نويسنده , , M and Vidal-Sitjes، نويسنده , , G and Veltri، نويسنده , , M، نويسنده ,
Abstract :
The NOMAD-STAR detector is a silicon vertex detector installed in the NOMAD spectrometer at the CERN SPS neutrino beam. It consists of four layers of a passive boron carbide target with a total mass of 45 kg and five layers of 600 single-sided silicon microstrip detectors covering a total area of 1.14 m2. About 11,500νμ charged current interactions were reconstructed in the fiducial volume of NOMAD-STAR from the neutrino run in 1998. The potential use of silicon detectors for νμ(νe)↔ντ oscillations depends on the observation of the τ candidates by the experimental signature of a large impact parameter, in the case of the one prong decay of the τ, or a double vertex, in the case of the three prong decay. The main aim of NOMAD-STAR is to measure the impact parameter and vertex distributions of charged current interactions, which constitute the main backgrounds for the oscillation signals, to understand the significance of a potential signal in a future experiment. The present paper describes the experience gained in the operation of this silicon vertex detector, and the performance achieved with it.
