Neutrino phenomenology

Abstract

Currently, the paradigm of neutrinos is the existence of three light states that have non-zero masses and mixing angles, allowing the presence of oscillations between flavors. Necessarily the existence oscillations implies violation of leptonic number, which is not predicted in the Standard Model of Elementary Particles. How we can understand this phenomena? We will attempt to try to elucidate this behavior, testing the limits of paradigm of three neutrinos using different scenarios. Recently, new degrees of freedom called sterile neutrinos appear to be necessary by recent experimental evidence in neutrinos physics and cosmology. This has aroused the interest of testing the existence of such degrees of freedom in experiments using datain different experiments. Another big question, still unanswered is there are other interactions nature in addition to the four known interactions. Neutrinos have a unique feature to have their properties modified bypassage in the matter, the so-called effect Mikheyev-Smirnov-Wolfenstein. As the oscillations are affected bypassage of neutrino in matter we can analyze the effects of new interactions in the propagation of neutrinos. These new interactions called non-standard interactions (NSI) can be testedin dense media such as supernovas and Earth. Recently, experiments on satellite has been shown the existence of sources of gamma rays from galactic and extra-galactic origin with energies until hundreds of GeV. Other experiments showed more rare cases that this spectrum can extend until TeV energies. This may bedue to electromagnetic interactions or hadronic interactions. If it isdue the hadronic interactions, this will necessarily would produce neutrinos with very higher energies not available in other sources. We intend to study exotic neutrino oscillation phenomena, which can be radically change the production of the various neutrinos, which have not yet been ruled out by the current experiments. If some astrophysical object produce neutrinos and photons and these are detected in laboratory experiments then we can get a bit of information about the astrophysical object or to test the oscillation neutrino framework in such powerful environment. The research topic of astroparticle physics can learn a lot if you can have this type of multi-messenger astrophysics, photons and neutrinos. We intend using these different aspects of neutrino physics to try to understand the reason for the oscillations, the existence of new interactions and new mechanisms for oscillation of high energy neutrinos. (AU)