Results from the KARMEN neutrino experiment

Bodmann, B. E. J.; Booth, N. E.; Burtak, F.; Dodd, A.C.; Drexlin, G.; Eberhard, V.; Eitel, K.; Edgington, J.A.; Finckh, E.; Gemmeke, H.; Giorgins, G.; Glombik, A.; Grandegger, W.; Hanika, T.; Höβl, J.; Kleifges, M.; Kleinfeller, J.; Kretschmer, W.; Malik, A.; Maschuw, R.; Meyer, R. A.; Plischke, P.; Rapp, J.; Raupp, F.; Schilling, F. P.; Seligmann, B.; Wochele, J.; Wolf, J.; Wölfle, S.; Zeitnitz, B.

doi:10.1016/0375-9474(93)90706-4

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…(32) by the LSND appearance amplitude A µe sbl for δm 2 sbl ≃ 0.3 eV 2 . Equations (29) and (30) bound the degree to which ν e and ν µ are found in opposite pairs of mass eigenstates. Without loss of generality we assume that ν e is predominantly associated with ν 0 and ν 1 , and that ν µ is predominantly associated with ν 2 and ν 3 .…”

Section: New Resultsmentioning

confidence: 99%

“…The DAR data has higher statistics, but the allowed regions for the two processes are in good agreement. There are also restrictions from the null results of the BNL E-776 [29] and KARMEN [30] ν µ → ν e oscillation search experiments. The combined data suggest ν µ → ν e vacuum oscillation parameters that lie approximately along the line segment described by…”

Section: Experimental Constraints 31 Short Baseline: Lsnd Reactorsmentioning

confidence: 99%

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Variations on four-neutrino oscillations

et al. 1998

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We make a model-independent analysis of all available data that indicate neutrino oscillations. Using probability diagrams, we confirm that a mass spectrum with two nearly degenerate pairs of neutrinos separated by a mass gap of Ӎ1 eV is preferred over a spectrum with one mass eigenstate separated from the others. We derive some new relations among the four-neutrino mixing matrix elements. We design four-neutrino mass matrices with three active neutrinos and one sterile neutrino that naturally incorporate maximal oscillations of atmospheric and explain the solar neutrino and LSND results. The models allow either a large or small angle MSW or vacuum oscillation description of the solar neutrino deficit. The models predict ͑i͒ oscillations of either e → or e → s in long-baseline experiments at L/Eӷ1 km/GeV, with amplitude determined by the LSND oscillation amplitude and argument given by the atmospheric ␦m 2 , and ͑ii͒ the equality of the e disappearance probability, the disappearance probability, and the LSND → e appearance probability in short-baseline experiments. ͓S0556-2821͑98͒06921-5͔PACS number͑s͒: 14.60.Pq 4 He yield considerably weaker bounds ͓18͔. Another is that a small asymmetry (n Ϫn )/n ␥ տ7ϫ10 Ϫ5 of flavor neutrinos PHYSICAL REVIEW D, VOLUME 58, 093016

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Section: New Resultsmentioning

confidence: 99%

Section: Experimental Constraints 31 Short Baseline: Lsnd Reactorsmentioning

confidence: 99%

Variations on four-neutrino oscillations

et al. 1998

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“…Finally, indications in favor ofν µ →ν e oscillations have been found recently in the LSND experiment [12], in which antineutrinos originating from the decays of µ + 's at rest were detected. The KARMEN experiment [13] will be able to crosscheck the positive result of LSND in the near future. From the analysis of the data of the LSND experiment and the negative results of other shortbaseline experiments (in particular, the Bugey [14] and BNL E776 [15] experiments), one obtains the oscillation parameters:…”

Section: Introductionmentioning

confidence: 99%

Three neutrinoΔm2scales and the singular seesaw mechanism

1998

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It is shown that the singular seesaw mechanism can simultaneously explain all the existing data supporting nonzero neutrino masses and mixing. The three mass-squared differences that are needed to accommodate the atmospheric neutrino data (through νµ −νs oscillation), the solar neutrino data via MSW mechanism (through νe − ντ oscillation), and the positive result of νµ − νe oscillation from LSND can be generated by this mechanism, whereas the vacuum oscillation solution to the solar neutrino problem is disfavored. We find that the electron and tau neutrino masses are of order 10 −3 eV, and the muon neutrino and a sterile neutrino are almost maximally mixed to give a mass of order 1 eV. Two heavy sterile neutrinos have a mass of order 1 keV which can be obtained by the double seesaw mechanism with an intermediate mass scale ∼ 10 5 GeV. A possible origin of such a scale is discussed.

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“…The LSND experiment has reported positive appearance results ofν µ →ν e oscillations, which implies ∆m 2 eµ ≃ 1 eV 2 and sin 2 (2θ eµ ) ≃ 10 −2 [6]. However, a large part of its parameter space is excluded by the null results of the KARMEN data [7].…”

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confidence: 99%

A model for neutrino warm dark matter and neutrino oscillations

Song

2001

Physics Letters B

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The muon-and tau-neutrinos with the mass in the keV range, which are allowed in a low reheating temperature cosmology, can compose the warm dark matter of the universe. A model of four light neutrinos including the keV scale ν µ and ν τ is studied, which combines the seesaw mechanism and the Abelian flavor symmetry. The atmospheric neutrino anomaly is due to the ν µ − ν τ oscillation. The solar neutrino problem is answered by the oscillation into the light sterile neutrino, where the SMA, LMA, and LOW-QVO solutions can be accommodated in our scenario.

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Results from the KARMEN neutrino experiment

Cited by 9 publications

References 7 publications

Variations on four-neutrino oscillations

Variations on four-neutrino oscillations

Three neutrinoΔm2scales and the singular seesaw mechanism

A model for neutrino warm dark matter and neutrino oscillations

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