BSM physics
Beyond the Standard Model searches with atmospheric and reactor neutrino data
Beyond the Standard Model physics using neutrino oscillation data, in particular atmospheric neutrinos measured by IceCube DeepCore, combined with reactor and other experiments. Using the global-fit framework Newtrinos.jl, we test new-physics scenarios that modify the standard three-flavor oscillation picture, including:
- Extra copies of the Standard Model — searching for the signature of an “N-naturalness” tower of neutrinos, a proposed solution to the electroweak hierarchy problem that predicts additional sterile-like states from mirror copies of the Standard Model.
- Extra spatial dimensions — analyzing neutrino data for the effects of large extra dimensions with massive bulk fields, which can appear in oscillation data as effective sterile-neutrino-like mixing.
- Non-unitarity of the neutrino mixing matrix — testing whether the PMNS matrix remains unitary using a joint fit of atmospheric and reactor neutrino data, a generic signature of heavy new states mixing with the known neutrinos.
Left to right: exclusion limits on extra-dimensional compactification radius; combined exclusion contours for the N-naturalness tower of neutrinos; posterior constraints on non-unitary mixing matrix elements.
Further Information
Collaborators: Manuel Ettengruber, Alan Zander (TUM), Sofia Lonardi, Tetiana Kozynets, Prof. D. Jason Koskinen (NBI)
- Searching for the $N$-naturalness tower of neutrinos: https://arxiv.org/abs/2607.14243
- Neutrino data analysis of extra-dimensional theories with massive bulk fields: https://arxiv.org/abs/2508.04274
- Constraints on non-unitary neutrino mixing in light of atmospheric and reactor neutrino data: https://arxiv.org/abs/2407.20388
- Testing the number of neutrino species with a global fit of neutrino data: https://arxiv.org/abs/2402.00490