# Experimental bounds on sterile-active neutrino mixing angles

 Type: Master thesis Title: Experimental bounds on sterile-active neutrino mixing angles Author: Petač, Mihael Issue Date: 2015-06-30 Keywords: sterile neutrinosneutrino oscillationsdirect detectionheavy neutral leptonsmixing anglesexperimental bounds Abstract: Despite the success of the Standard Model in the last few decades, we know it is not complete. There is strong motivation for assuming the existence of aditional heavy neutral leptons, which can account for active neutrino masses and possibly also have cosmological implications. In this work I consider the Standard Model with two neutral lepton singlets (sterile neutrinos) with degenerated masses in the range $20MeV - 2GeV$. The constraints on the active-sterile neutrino mixing angles are evaluated based on recent neutrino oscillations data. Using these constraints the bounds from accelerator experiments are reanalyzed for the case of the considered model. Finally, the results are compared with cosmological constraints coming from Big Bang nucleosynthesis and the $\nu MSM$ resonant leptogenesis. Supervisor: Boyarsky, Alexey Faculty: Faculty of Science Department: Physics (Master) Specialisation: Research in Theoretical Physics ECTS Credits: 8 Handle: http://hdl.handle.net/1887/37098

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