The NOMAD experiment at the CERN SPS

The NOMAD experiment is a short base-line search for $\nu_{\mu}\rightarrow \nu_{\tau}$ oscillations in the CERN neutrino beam. The $\nu_{\tau}$'s are searched for through their charged-current interactions followed by the observation of the resulting $\tau^{-}$ through its electronic, muonic or hadronic decays. These decays are recognized using kinematical criteria necessitating the use of a light target which enables the reconstruction of individual particles produced in the neutrino interactions. This paper describes the various components of the NOMAD detector: the target and muon drift chambers, the electromagnetic and hadronic calorimeters, the preshower and transition radiation detectors, and the veto and trigger scintillation counters. The beam and data acquisition system are also described. The quality of the reconstruction of individual particles is demonstrated through the ability of NOMAD to observe K$^0_{\rm s}$'s, $\Lambda^0$'s and $\pi^0$'s. Finally, the observation of $\tau^{-}$ through its electronic decay being one of the most promising channels in the search, the identification of electrons in NOMAD is discussed

Precision Measurement of Scaled Momentum, Charge Multiplicity and Thrust in νμN\nu_{\mu}N and ν‾μN\overline\nu_{\mu}N Interactions

We report the first precision measurements of the scaledmomentum, the charge multiplicity, and the thrust of hadronic jets inthe Breit frame in Deep Inelastic Scattering \nun\ and\nunbar\ charged current events over the $Q^2$ range from 1 to 100 \GeVsq\ . Theneutrino data, obtained in the NOMAD experiment at the CERN SPS, extend the $Q^2$-evolution ofthese parametersby two orders of magnitude, and with commensurate precision, whencompared to those reported by the \ep\ and \ee\ experiments