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Performance of the NOMAD-STAR detector

Abstract : The NOMAD-STAR detector is a silicon vertex 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 1.14m^2. About 11,500 nu_mu 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 nu_mu (nu_e)<-> nu_tau oscillations depends on the observation of the tau candidates by the experimental signature of a large impact parameter, in the case of the one prong decay of the tau, 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 peformance achieved with it.
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Contributor : Claudine Bombar <>
Submitted on : Friday, January 16, 2004 - 3:15:01 PM
Last modification on : Friday, November 6, 2020 - 3:30:01 AM
Long-term archiving on: : Tuesday, June 2, 2015 - 1:05:46 PM


  • HAL Id : in2p3-00020245, version 1



G. Barichello, A. Cervera-Villanueva, D C. Daniels, M. Ellis, D. Ferrere, et al.. Performance of the NOMAD-STAR detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2003, 506, pp.217-237. ⟨in2p3-00020245⟩



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