Abstract
We study the effects produced by sterile Majorana neutrinos on the nu _{tau } flux traversing the Earth, considering the interaction between the Majorana neutrinos and the standard matter as modeled by an effective theory. The surviving tau-neutrino flux is calculated using transport equations including Majorana neutrino production and decay. We compare our results with the pure Standard Model interactions, computing the surviving flux for different values of the effective lagrangian couplings, considering the detected flux by IceCube for an operation time of 10 years, and Majorana neutrinos with mass m_N thicksim m_{tau }.
Highlights
On the other hand, in the recent years the observation of ultra high energy (UHE) astrophysical neutrinos in the IceCube telescope [10], with a yet unknown specific origin, spectral shape and flavor composition, as well as the nonfinding of tau-neutrinos in still primary searches performed within these data [11], raise the question on tau-neutrino detection in neutrino telescopes.In addition, anomalies found in short baseline (SBL) neutrino oscillation experiments [12,13,14,15] have driven the introduction of light, almost sterile neutrinos, which mix poorly with the known light mass states and could help to accommodate the data introducing a third mass splitting
We study the effects produced by sterile Majorana neutrinos on the ντ flux traversing the Earth, considering the interaction between the Majorana neutrinos and the standard matter as modeled by an effective theory
Anomalies found in short baseline (SBL) neutrino oscillation experiments [12,13,14,15] have driven the introduction of light, almost sterile neutrinos, which mix poorly with the known light mass states and could help to accommodate the data introducing a third mass splitting
Summary
In the recent years the observation of ultra high energy (UHE) astrophysical neutrinos in the IceCube telescope [10], with a yet unknown specific origin, spectral shape and flavor composition, as well as the nonfinding of tau-neutrinos in still primary searches performed within these data [11], raise the question on tau-neutrino detection in neutrino telescopes. As the mixing parameters for the second fermion family with a sterile Majorana neutrino νμ − νs are strongly constrained within the framework of 3 + 1 scenarios [7,19], and motivated by the lack of tau-neutrinos in the UHE cosmic flux in IceCube, in this work we study the possibilities that UHE tau-neutrinos from astrophysical sources may provide a signature for Majorana neutrino production by giving a surviving flux after traversing the Earth which may differ from the standard one.
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