The NuTeV Collaboration has extracted the electroweak parameter ${sin}^2{\theta }_W$ from the measurement of the ratios of neutral current to charged current $\nu$ and $\overline{\nu }$ cross sections. Our value, ${sin}^2{\theta }_W^{\left(\mathrm{on}-\mathrm{shell}\right)}=0.2277\mathrm{}\pm 0.0013\left(\mathrm{stat}\right)\pm 0.0009\left(\mathrm{syst}\right)$, is 3 standard deviations above the standard model prediction. We also present a model independent analysis of the same data in terms of neutral-current quark couplings.

This Letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rates and energy spectra of charged current ${\nu }_{\mu }$ interactions are compared in two detectors located along the beam axis at distances of 1 and 735 km. With $1.27\times {10}^{20}$ 120 GeV protons incident on the NuMI target, 215 events with energies below 30 GeV are observed at the Far Detector, compared to an expectation of $336\pm 14$ events. The data are consistent with ${\nu }_{\mu }$ disappearance via oscillations with $|\Delta m_{32}^2|={2.74}_{-0.26}^{+0.44}\times {10}^{-3}{\mathrm{eV}}^2$ and ${sin}^2(2{\theta }_{23})>0.87$ (68% C.L.).

We present a measurement of neutrino tridents, muon pairs induced by neutrino scattering in the Coulomb field of a target nucleus, in the Columbia-Chicago-Fermilab-Rochester neutrino experiment at the Fermilab Tevatron. The observed number of tridents after geometric and kinematic corrections, 37.0±12.4, supports the standard-model prediction of 45.3±2.3 events. This is the first demonstration of the W-Z destructive interference from neutrino tridents, and rules out, at 99% C.L., the V-A prediction without the interference.

This Letter reports new results from the MINOS experiment based on a two-year exposure to muon neutrinos from the Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of neutrino flavor with mass splitting $|\Delta m^2|=(2.43\pm 0.13)\times {10}^{-3}{\mathrm{eV}}^2$ (68% C.L.) and mixing angle ${sin}^2(2\theta )>0.90$ (90% C.L.). Our data disfavor two alternative explanations for the disappearance of neutrinos in flight: namely, neutrino decays into lighter particles and quantum decoherence of neutrinos, at the 3.7 and 5.7 standard-deviation levels, respectively.

We report results from the first search for ${\nu }_{\mu }\to {\nu }_e$ transitions by the NOvA experiment. In an exposure equivalent to $2.74\times {10}^{20}$ protons on target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of $0.99\pm 0.11(\text{syst})$ events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of $1.07\pm 0.14(\text{syst})$. The $3.3\sigma$ excess of events observed in the primary analysis disfavors $0.1\pi <{\delta }_{CP}<0.5\pi$ in the inverted mass hierarchy at the 90% C.L.