Status of Oscillation plus Decay of Atmospheric and Long-Baseline Neutrinos

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dc.creatorGonzalez-Garcia, M. C.
dc.creatorMaltoni, Michele
dc.date2008-02-26
dc.date2008-04-15
dc.date.accessioned2026-07-07T11:40:29Z
dc.date.available2026-07-07T11:40:29Z
dc.descriptionWe 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 nu_mu -> nu_tau oscillations with parameters Delta_m32^2 = 2.6e-3 eV^2 and theta_23 ~ 34 degrees plus decay of the heavy neutrino, nu_3, with lifetime of the order tau_3/m_3 ~ 2.6e-12 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 tau_3/m_3 > 9.3e-11 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 nu_3 and an unmixed very light sterile state, |g_s3| < 8.6e-3 (2.2 eV/m_3).
dc.descriptionLaTeX file using elsart style, 10 pages and 2 figures included. Final version
dc.identifierhttps://arxiv.org/abs/0802.3699
dc.identifierhttp://arxiv.org/abs/0802.3699
dc.identifierPhys.Lett.B663:405-409,2008
dc.identifierdoi:10.1016/j.physletb.2008.04.041
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200268
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Experiment
dc.titleStatus of Oscillation plus Decay of Atmospheric and Long-Baseline Neutrinos
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