Ponente
Descripción
Several anomalies in reactor and accelerator neutrino experiments motivate the search for sterile neutrinos at mass splittings in the eV-scale. We present an analysis that probes the elements $U_{\mu4}$ and $U_{\tau4}$ of the extended (3+1) neutrino mixing matrix using an 8 year data sample from IceCube’s DeepCore sub-array containing atmospheric neutrinos between 5 and 300 GeV. The analysis is expected to produce world leading limits on $|U_{\mu4}|$ and $|U_{\tau4}|$ under the assumption of sterile mass splittings between 1 and 100 eV$^{2}$, as well as limits on $|U_{\mu4}|$ for sterile mass splittings below 1 eV$^{2}$. We specifically discuss how we overcame the challenges of efficiently calculating neutrino oscillation probabilities in the presence of very fast sterile oscillations as well as the impact of the additional sterile CP-violating phase $\delta_{24}$
