Speaker
Dr
Sushant Raut
(KTH Royal Institute of Technology)
Description
The IceCube experiment at the South Pole has been observing ultra high
energy neutrinos in the TeV-PeV range and beyond. At such high energies,
these neutrinos allow new physics searches, which can be complementary
to searches at collider experiments. In this work, we discuss an analysis
of IceCube data in the context of neutrino decay.
We use the first three years of data from IceCube to probe neutrino decay.
We consider a distribution of diffuse ultra high energy neutrinos from
active galactic nuclei (AGNs), based on a standard astrophysical model.
We consider flavour mixing of these neutrinos through the usual oscillations
as well as because of neutrino decay. For neutrinos from the Northern sky,
the flux attenuation and energy shift due to interactions with earth
matter is significant at the energies under consideration. We take these
effects into account in our analysis. Finally, we compare the theoretically
expected events with experimental data, to put bounds on the neutrino decay
lifetime.
We show our results for specific source flavour ratios of astrophysical
neutrinos, and for a number of possible decay scenarios. Our analysis
allows us to put a model-independent bound on the decay lifetime. The
results are also shown as a function of the flavour ratios of neutrinos,
to show how departure from standard physics scenarios can manifest
themselves in the data.
Author
Dr
Sushant Raut
(KTH Royal Institute of Technology)
Co-authors
Mattias Blennow
(KTH Royal Institute of Technology)
Sandhya Choubey
(Harish-Chandra Research Institute)
