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## Standard physics experiments

Two experiments are presently running at the Fermilab 800 GeV Tevatron. NuTeV uses a neutrino beam from the decay of sign-selected hadrons, which allows to unambiguously distinguish  and  interactions. With such a beam, the measurement of the cross-section ratio between neutral-current and charged-current neutrino-nucleon interactions leads to a precise determination of the weak mixing angle, sin , and also to a precise measurement of the parameter  which describes the ratio of neutral to charged-current coupling strengths. NuTeV will measure sin  with an expected total error of  and  with an error of . Within the electroweak theory these measurements can be expressed in terms of equivalent measurements of the top quark and W boson masses. Any significant difference between the NuTeV results and direct measurements of the top and W masses would provide indirect evidence for new physics. Experiment E-872 (DONUT, for Direct observation of NU-Tau) aims at the first observation of  charged-current interactions. DS mesons produced by the interactions of 800 GeV protons in a beam dump decay to 's which are detected by observing  production and subsequent decay in an emulsion target.

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