O. L. G. Peres

Atmospheric neutrinos: LMA oscillations, Ue3 induced interference and CP-violation

Abstract We consider oscillations of the low energy (sub-GeV sample) atmospheric neutrinos in the three neutrino context. We present the semi-analytic study of the neutrino evolution and calculate characteristics of the e-like events (total number, energy spectra and zenith angle distributions) in the presence of oscillations. At low energies there are three different contributions to the number of events: the LMA contribution (from νe-oscillations driven by the solar oscillation parameters), the Ue3-contribution proportional to s132, and the Ue3-induced interference of the two amplitudes driven by the solar oscillation parameters. The interference term is sensitive to the CP-violation phase. We describe in details properties of these contributions. We find that the LMA, the interference and Ue3 contributions can reach 5–6%, 2–3% and 1–2% correspondingly. An existence of the significant (>3–5%) excess of the e-like events in the sub-GeV sample and the absence of the excess in the multi-GeV range testifies for deviation of the 2–3 mixing from maximum. We consider a possibility to measure the deviation as well as the CP-violation phase in future atmospheric neutrino studies.

(3+1)-spectrum of neutrino masses: a chance for LSND?

If active to active neutrino transitions are dominant modes of the atmospheric (

Neutrino mass spectrum and future beta decay experiments

\nu_{\mu} \to \nu_{\tau}

Probing the stability of superheavy dark matter particles with high-energy neutrinos

) and the solar neutrino oscillations (

TESTING THE SOLAR NEUTRINO CONVERSION WITH ATMOSPHERIC NEUTRINOS

\nu_{e}\to \nu_{\mu}/\nu_{\tau}

Constraining Sterile Neutrinos with AMANDA and IceCube Atmospheric Neutrino Data

), as is indicated by recent data, the favoured scheme which accommodates the LSND result - the so called (2+2)-scheme - should be discarded. We introduce the parameters

Probing the LSND mass scale and four neutrino scenarios with a neutrino telescope

\eta_s^{atm}

(3+1)-spectrum of neutrino masses: A chance for LSND?

and

KATRIN Sensitivity to Sterile Neutrino Mass in the Shadow of Lightest Neutrino Mass

\eta_s^{sun}

Global analysis of the post-SNO solar neutrino data for standard and nonstandard oscillation mechanisms

which quantify an involvement of the sterile component in the solar and atmospheric neutrino oscillations. The (2+2)-scheme predicts