Showing papers by "Mcd Sanchez published in 2017"
TL;DR: In this article, the first search for sterile neutrinos mixing with active neutrino through a reduction in the rate of neutral-current interactions over a baseline of 810 km between the NOvA detectors was reported.
Abstract: We report results from the first search for sterile neutrinos mixing with active neutrinos through a reduction in the rate of neutral-current interactions over a baseline of 810 km between the NOvA detectors. Analyzing a 14-kton detector equivalent exposure of 6.05×10^(20) protons-on-target in the NuMI beam at Fermilab, we observe 95 neutral-current candidates at the Far Detector compared with 83.5 ± 9.7(stat) ± 9.4(syst) events predicted assuming mixing only occurs between active neutrino species. No evidence for ν_μ→ν_s transitions is found. Interpreting these results within a 3+1 model, we place constraints on the mixing angles θ_(24) < 20.8° and θ_(34_ < 31.2° at the 90% C.L. for 0.05 eV^2 ≤ Δm^2_(41) ≤ 0.5 eV2, the range of mass splittings that produce no significant oscillations over the Near Detector baseline.
82 citations
Posted Content•
TL;DR: The RD and a physics run with a fully-instrumented detector (phase II) was described in this paper. But the results of the first phase were limited and the detector design was not discussed.
Abstract: The RD and a physics run with a fully-instrumented detector (Phase II). This paper gives preliminary results of the first phase and described the detector design upgrades necessary for the next phase.
27 citations
Fermilab1, Argonne National Laboratory2, Iowa State University3, University of Cincinnati4, University of Oxford5, Brookhaven National Laboratory6, Lancaster University7, University of Cambridge8, University of Texas at Austin9, Universidade Federal de Goiás10, University of Manchester11, Tufts University12, Indiana University13, South Dakota School of Mines and Technology14, College of William & Mary15, University of Sussex16, State University of Campinas17, Harvard University18, College of the Holy Cross19, University of Minnesota20, University College London21, University of São Paulo22, University of Pittsburgh23, Illinois Institute of Technology24, University of Warsaw25, Stanford University26
TL;DR: In this article, the authors report new constraints on flavor-changing nonstandard neutrino interactions from the MINOS longbaseline experiment using νe and ¯νe appearance candidate events from predominantly νμ and¯νμ beams.
Abstract: We report new constraints on flavor-changing nonstandard neutrino interactions from the MINOS longbaseline experiment using νe and ¯νe appearance candidate events from predominantly νμ and ¯νμ beams. We used a statistical selection algorithm to separate νe candidates from background events, enabling an analysis of the combined MINOS neutrino and antineutrino data. We observe no deviations from standard neutrino mixing, and thus place constraints on the nonstandard interaction matter effect, |eeτ|, and phase, (δCP + δeτ), using a 30-bin likelihood fit.
8 citations
21 Jun 2017
6 citations