41,914 research outputs found

    Improving LMA predictions with non-standard interactions: neutrino decay in solar matter?

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    It has been known for some time that the well established LMA solution to the observed solar neutrino deficit fails to predict a flat energy spectrum for SuperKamiokande as opposed to what the data indicates. It also leads to a Chlorine rate which appears to be too high as compared to the data. We investigate the possible solution to these inconsistencies with non standard neutrino interactions, assuming that they come as extra contributions to the νανβ\nu_{\alpha}\nu_{\beta} and ναe\nu_{\alpha}e vertices that affect both the propagation of neutrinos in the sun and their detection. We find that, among the many possibilities for non standard couplings, only the diagonal imaginary ones lead to a solution to the tension between the LMA predictions and the data, implying neutrino instability in the solar matter. Unitarity requirements further restrict the solution and a neutrino decay into an antineutrino and a majoron within the sun is the one favoured. Antineutrino probability is however too small to open the possibility of experimentally observing antineutrinos from the sun due to NSI.Comment: 27 pages, 8 figures. Final version to be published in Physical Review

    Improving LMA predictions with non standard interactions

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    It has been known for some time that the well established LMA solution to the observed solar neutrino deficit fails to predict a flat energy spectrum for SuperKamiokande as opposed to what the data indicates. It also leads to a Chlorine rate which appears to be too high as compared to the data. We investigate the possible solution to these inconsistencies with non standard neutrino interactions, assuming that they come as extra contributions to the νανβ\nu_{\alpha}\nu_{\beta} and ναe\nu_{\alpha}e vertices that affect both the propagation of neutrinos through solar matter and their detection. We find that, among the many possibilities for non standard couplings, only one of them leads to a flat SuperKamiokande spectral rate in better agreement with the data and predicts a Chlorine rate within 1σ\sigma of the observed one, while keeping all other predictions accurate

    New Formulas and Predictions for Running Fermion Masses at Higher Scales in SM, 2HDM, and MSSM

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    Including contributions of scale-dependent vacuum expectation values, we derive new analytic formulas and obtain substantially different numerical predictions for the running masses of quarks and charged-leptons at higher scales in the SM, 2HDM and MSSM. These formulas exhibit significantly different behaviours with respect to their dependence on gauge and Yukawa couplings than those derived earlier. At one-loop level the masses of the first two generations are found to be independent of Yukawa couplings of the third generation in all the three effective theories in the small mixing limit. Analytic formulas are also obtained for running tanβ(μ)\tan\beta(\mu) in 2HDM and MSSM. Other numerical analyses include study of the third generation masses at high scales as functions of low-energy values of tanβ\tan\beta and SUSY scale MS=MZ104M_S=M_Z-10^4 GeV.Comment: 42 pages RevTeX, including 16 figures. Typos corrected and one reference adde

    Supersymmetry and the Chiral Schwinger Model

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    We have constructed the N=1/2 supersymmetric general Abelian model with asymmetric chiral couplings. This leads to a N=1/2 supersymmetrization of the Schwinger model. We show that the supersymmetric general model is plagued with problems of infrared divergence. Only the supersymmetric chiral Schwinger model is free from such problems and is dynamically equivalent to the chiral Schwinger model because of the peculiar structure of the N=1/2 multiplets.Comment: one 9 pages Latex file, one ps file with one figur
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