Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing

TL;DR

This paper develops a phenomenological model incorporating sterile neutrinos to analyze their impact on active neutrino oscillation characteristics at short distances, providing modified probabilities and new parameterizations to interpret experimental anomalies.

Contribution

It introduces a new parametrization of active-sterile neutrino mixing that includes additional CP violation sources and applies it to interpret short-distance neutrino data anomalies.

Findings

Modified oscillation probability dependencies on model parameters

Potential clarification of short-distance neutrino data anomalies

Estimates of model parameters consistent with experimental data

Abstract

A phenomenological model with active and sterile neutrinos is used for calculations of neutrino oscillation characteristics at the normal mass hierarchy of active neutrinos. Taking into account the contributions of sterile neutrinos, appearance and survival probabilities for active neutrinos are calculated. Modified graphical dependencies for the probability of appearance of electron neutrinos/antineutrinos in muon neutrino/antineutrino beams as a function of the ratio of the distance to the neutrino energy and other model parameters are obtained. It is shown that in the case of a certain type mixing between active and sterile neutrinos it is possible to clarify some features of the anomalies of neutrino data at short distances. A new parametrization for a particular type mixing matrix of active and sterile neutrinos that takes into account the additional sources of CP violation is used. The comparison with the existing experimental data is performed and, with using this knowledge, the estimates of some model parameters are found. The theoretical results obtained for mixing of active and sterile neutrinos can be applied for interpretation and prediction of results of ground-based experiments on search of sterile neutrinos as well as for analyses of some astrophysical data.