June 22, 2020 to July 2, 2020
US/Central timezone

Bounds on secret neutrino interactions from high-energy astrophysical neutrinos

Not scheduled


Dr Mauricio Bustamante (Niels Bohr Institute, University of Copenhagen)


Neutrinos offer a window to physics beyond the Standard Model. In particular, high-energy astrophysical neutrinos, with TeV-PeV energies, may provide evidence of new, "secret" neutrino-neutrino interactions that are stronger than ordinary weak interactions. During their propagation over cosmological distances, high-energy neutrinos could interact with the cosmic neutrino background via secret interactions, developing characteristic energy-dependent features in their observed energy distribution. For the first time, we use a rigorous statistical analysis to look for signatures of secret neutrino interactions in the diffuse flux of high-energy astrophysical, based on 6 years of publicly available IceCube High Energy Starting Events (HESE). We find no significant evidence for secret neutrino interactions, but place competitive upper limits on the coupling strength of the new mediator through which they occur, in the mediator mass range of 1-100 MeV.


IceCube high-energy neutrino events set new limits to new, "secret" neutrino-neutrino interactions

Primary author

Dr Mauricio Bustamante (Niels Bohr Institute, University of Copenhagen)


Ms Charlote Rosenstrom (Niels Bohr Institute, University of Copenhagen) Prof. Irene Tamborra (Niels Bohr Institute) Dr Shashank Shalgar (Niels Bohr Institute, University of Copenhagen)

Presentation materials