152 research outputs found

    Constraints on Sterile Neutrino Oscillations using DUNE Near Detector

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    DUNE (Deep Underground Neutrino Experiment) is a proposed long-baseline neutrino experiment in the US with a baseline of 1300 km from Fermi National Accelerator Laboratory (Fermilab) to Sanford Underground Research Facility, which will house a 40 kt Liquid Argon Time Projection Chamber (LArTPC) as the far detector. The experiment will also have a fine grained near detector for accurately measuring the initial fluxes. We show that the energy range of the fluxes and baseline of the DUNE near detector is conducive for observing νμνe\nu_\mu \to \nu_e oscillations of Δm2\Delta m^2 \sim eV2^2 scale sterile neutrinos, and hence can be effectively used for testing to very high accuracy the reported oscillation signal seen by the LSND and MiniBooNE experiments. We study the sensitivity of the DUNE near detector to sterile neutrino oscillations by varying the baseline, detector fiducial mass and systematic uncertainties. We find that the detector mass and baseline of the currently proposed near detector at DUNE will be able to test the entire LSND parameter region with good precision. The dependence of sensitivity on baseline and detector mass is seen to give interesting results, while dependence on systematic uncertainties is seen to be small.Comment: 16 pages, 5 figure

    Bounds on Non-Standard Neutrino Interactions Using PINGU

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    We investigate the impact of non-standard neutrino interactions (NSIs) on atmospheric neutrinos using the proposed PINGU experiment. In particular, we focus on the matter NSI parameters εμτ\varepsilon_{\mu\tau} and εττεμμ|\varepsilon_{\tau\tau} - \varepsilon_{\mu\mu}| that have previously been constrained by the Super-Kamiokande experiment. First, we present approximate analytical formulas for the difference of the muon neutrino survival probability with and without the above-mentioned NSI parameters. Second, we calculate the atmospheric neutrino events at PINGU in the energy range (2-100) GeV, which follow the trend outlined on probability level. Finally, we perform a statistical analysis of PINGU. Using three years of data, we obtain bounds from PINGU given by 0.0043 (0.0048)<εμτ<0.0047 (0.0046)-0.0043~(-0.0048) < \varepsilon_{\mu\tau} < 0.0047~(0.0046) and 0.03 (0.016)<εττ<0.017 (0.032)-0.03~(-0.016) < \varepsilon_{\tau\tau} < 0.017~(0.032) at 90 % confidence level for normal (inverted) neutrino mass hierarchy, which improve the Super-Kamiokande bounds by one order of magnitude. In addition, we show the expected allowed contour region in the εμτ\varepsilon_{\mu\tau}-εττ\varepsilon_{\tau\tau} plane if NSIs exist in Nature and the result suggests that there is basically no correlation between εμτ\varepsilon_{\mu\tau} and εττ\varepsilon_{\tau\tau}.Comment: 19 pages, 7 figures. Final version published in Phys. Lett.