Mainz 2014 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 41: Neutrinophysik (Theorie)

T 41.6: Vortrag

Montag, 24. März 2014, 18:00–18:15, P108

Oscillation phenomenology of gauged sterile neutrinos — Joachim Kopp and •Johannes Welter — Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland

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 baryons via a new U(1)_B gauge boson. Recently, the impact of this model on short-baseline neutrino oscillations has been studied, and it has been claimed that sterile neutrinos interacting with baryons have the possibility to explain the observed neutrino oscillation anomalies. In this talk, we investigate the oscillation phenomenology of this model. We derive analytical approximations for the oscillation probabilities and revise the results from the literature. We perform a numerical χ² analysis with data sets from MINOS, MiniBooNE and solar experiments. The results show that baryonic sterile neutrinos cannot resolve the tension 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.