12,272 research outputs found

    Inconsistencies in Interpreting the Atmospheric Neutrino Anomaly

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    We note a discrepancy between the value of R expected on the basis of the muon neutrino angular distribution and the value actually observed. The energy independence of RR leads to a fine tuning problem. This may be indicative of some unaccounted for new physics.Comment: 3 pages, 5 figure

    Analytic Calculation of Neutrino Mass Eigenvalues

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    Implicaion of the neutrino oscillation search for the neutrino mass square difference and mixing are discussed. We have considered the effective majorana mass m_{ee}, related for \beta\beta_{0\nu}decay. We find limits for neutrino mass eigen value m_{i} in the different neutrino mass spectrum,which explain the different neutrino data.Comment: 10 page

    Results from K2K and status of T2K

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    Results from the K2K experiment and status of the T2K experiment are reported.Comment: 9 pages, 6 figures. Talk at International Conference on New Trends in High-Energy Physics (Crimea2005), Yalta, Ukraine, September 10-17, 200

    Super-Kamiokande data and atmospheric neutrino decay

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    Neutrino decay has been proposed as a possible solution to the atmospheric neutrino anomaly, in the light of the recent data from the Super-Kamiokande experiment. We investigate this hypothesis by means of a quantitative analysis of the zenith angle distributions of neutrino events in Super-Kamiokande, including the latest (45 kTy) data. We find that the neutrino decay hypothesis fails to reproduce the observed distributions of muons.Comment: 6 pages (RevTeX) + 2 figures (Postscript

    Neutrino masses and mixing angles from leptoquark interactions

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    In this paper we show that the mixing between leptoquarks (LQ's) from different SU(2)lSU(2)_l multiplets can generate a non-trivial Majorana mass matrix for neutrinos through one loop self energy diagrams. Such mixing can arise from gauge invariant and renormalizable LQ-Higgs interaction terms after EW symmetry breaking. We use the experimental indication on neutrino oscillation to find constraints on specific combinations of LQ couplings to quark-lepton pairs and to the SM higgs boson. These constraints are compared with the ones from πeνˉe\pi\to e\bar {\nu}_e.Comment: The expressions for majorana mass matrix of neutrinos have been corrected so that they are symmetric. Final version to be published in Physical Review

    Searching for νμντ\nu_\mu \to \nu_\tau Oscillations with Extragalactic Neutrinos

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    We propose a novel approach for studying νμντ\nu_\mu \to \nu_\tau oscillations with extragalactic neutrinos. Active Galactic Nuclei and Gamma Ray Bursts are believed to be sources of ultrahigh energy muon neutrinos. With distances of 100 Mpc or more, they provide an unusually long baseline for possible detection of νμντ\nu_\mu \to \nu_\tau with mixing parameters Δm2\Delta m^2 down to 101710^{-17}eV2^2, many orders of magnitude below the current accelerator experiments. By solving the coupled transport equations, we show that high-energy ντ\nu_\tau's, as they propagate through the earth, cascade down in energy, producing the enhancement of the incoming ντ\nu_\tau flux in the low energy region, in contrast to the high-energy νμ\nu_\mu's, which get absorbed. For an AGN quasar model we find the ντ\nu_\tau flux to be a factor of 2 to 2.5 larger than the incoming flux in the energy range between 10210^2 GeV and 10410^4 GeV, while for a GRB fireball model, the enhancement is 10%-27% in the same energy range and for zero nadir angle. This enhancement decreases with larger nadir angle, thus providing a novel way to search for ντ\nu_\tau appearance by measuring the angular dependence of the muons. To illustrate how the cascade effect and the ντ\nu_\tau final flux depend on the steepness of the incoming ντ\nu_\tau, we show the energy and angular distributions for several generic cases of the incoming tau neutrino flux, Fν0EnF_\nu^0 \sim E^{-n} for n=1,2 and 3.6. We show that for the incoming flux that is not too steep, the signal for the appearance of high-energy ντ\nu_\tau is the enhanced production of lower energy μ\mu and their distinctive angular dependence, due to the contribution from the τ\tau decay into μ\mu just below the detector.Comment: 11 pages, including 4 color figure

    Weak and Electromagnetic Nuclear Decay Signatures for Neutrino Reactions in SuperKamiokande

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    We suggest the study of events in the SuperKamiokande neutrino data due to charged- and neutral-current neutrino reactions followed by weak and/or electromagnetic decays of struck nuclei and fragments thereof. This study could improve the prospects of obtaining evidence for τ\tau production from νμντ\nu_\mu \to \nu_\tau oscillations and could augment the data sample used to disfavor νμνsterile\nu_\mu \to \nu_{sterile} oscillations.Comment: 7 pages, latex, to appear in Phys. Rev. Let

    The MSW Effect in Quantum Field Theory

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    We show in detail the general relationship between the Schr\"{o}dinger equation approach to calculating the MSW effect and the quantum field theoretical S-matrix approach. We show the precise form a generic neutrino propagator must have to allow a physically meaningful ``oscillation probability'' to be decoupled from neutrino production fluxes and detection cross-sections, and explicitly list the conditions---not realized in cases of current experimental interest---in which the field theory approach would be useful.Comment: 20 page REVTeX file, submitted to Phys. Rev.

    Neutrinos and Gauge Unification

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    The approximate unification of gauge couplings is the best indirect evidence for low-energy supersymmetry, although it is not perfect in its simplest realizations. Given the experimental evidence for small non-zero neutrino masses, it is plausible to extend the MSSM with three right-handed neutrino chiral multiplets, with large Majorana masses below the unification scale, so that a see-saw mechanism can be implemented. In this extended MSSM, the unification prediction for the strong gauge coupling constant at M_Z can be lowered by up to \sim 5%, bringing it closer to the experimental value at 1\sigma, therefore improving significantly the accuracy of gauge coupling unification.Comment: 5 pages, LaTeX, 1 figur

    Leptogenesis with Almost Degenerate Majorana Neutrinos

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    We investigate the leptogenesis with almost degenerate neutrinos, in the framework of democratic mass matrix, which naturally explains the large mixing angles for neutrino oscillations as well as quark masses and mixing matrix. We find that the baryon asymmetry in the present universe is explained via the decays of right-handed neutrinos produced nonthermally by the inflaton decay. The model predicts neutrinoless double beta decays accessible in near future experiments.Comment: 17 pages, LaTeX, 2 figure
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