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Oscillation phenomenology of gauged sterile neutrinos


Welter,  Johannes Marie René
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Welter, J. M. R. (2013). Oscillation phenomenology of gauged sterile neutrinos. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-C161-3
As a possible solution to currently unresolved anomalies in dark matter direct detection experiments a Standard Model extension was proposed by Pospelov in 2011, containing a sterile neutrino with mass of the order eV, which interacts with matter via a new baryonic gauge boson. Recently, the impact of this model on the shortbaseline anomaly has been studied by Karagiorgi, Shaevitz and Konrad. Their results indicate that sterile neutrinos interacting with baryons stronger than weak force have the possibility to explain the tensions of the anomaly. In this thesis, we investigate the oscillation phenomenology of this model. We re-derive analytical approximations for the oscillation probabilities in this framework and revise the previous result. We perform a numerical x2 analysis with data sets from MINOS, MiniBooNE and solar experiments. The results show that baryonic sterile neutrinos can not resolve the tensions obtained in simple sterile neutrino scenarios. Assuming that the MiniBooNE signal is due to active-sterile mixing in a three active plus one sterile neutrino framework we conclude that the interesting parameter range for the baryonic matter potential is disfavoured.