Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10724726 | Physics Letters B | 2008 | 5 Pages |
Abstract
We study the interplay of neutrino oscillation and invisible decay in atmospheric and long-baseline neutrinos experiments. We perform a global analysis of the full atmospheric data from Super-Kamiokande together with long-baseline K2K and MINOS in these scenarios. We find that the admixture of νμâÎ½Ï oscillations with parameters Îm322=2.6Ã10â3 eV2 and θ23â¼34° plus decay of the heavy neutrino, ν3, with lifetime of the order Ï3/m3â¼2.6Ã10â12 s/eV provides a reasonable fit to atmospheric neutrinos, although this solution becomes more disfavored (dropping to the 99% CL) once long-baseline data are included. Other than this local minimum, the analysis shows no evidence in favor of a non-vanishing neutrino decay width and an lower bound on the decay lifetime Ï3/m3⩾9.3Ã10â11 s/eV is set at 99% CL. In the framework of Majoron models, this constraint can be translated into a bound on the Majoron coupling to ν3 and an unmixed very light sterile state, |gs3|⩽8.6Ã10â3(2.2 eV/m3).
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
M.C. Gonzalez-Garcia, Michele Maltoni,