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New limits on neutrino decay from the Glashow resonance of high-energy cosmic neutrinos

Not scheduled


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


Discovering neutrino decay would be strong evidence of new physics. Presently, there are only lax lower limits on the lifetime $\tau$ of neutrinos, of $\tau/m > 10^{-3}$ s eV$^{-1}$ or worse, where $m$ is the neutrino mass. Fortunately, TeV-PeV cosmic neutrinos offer superior sensitivity to decay due to their cosmological-scale baselines. We employ a promising method, recently proposed, that uses the Glashow resonance $\bar{\nu}_e + e \to W$, triggered by $\bar{\nu}_e$ of 6.3 PeV, to test decay with only a handful of detected events. Based on the recent detection of the first Glashow resonance candidate in IceCube, we place new lower limits on the lifetimes of $\nu_1$ and $\nu_2$ in the inverted mass ordering. For $\nu_2$, our limit is the current best. For $\nu_1$, our limit is close to the current best and will surpass it soon.


The first Glashow resonance candidate disfavors neutrino decay in the inverted mass ordering

Primary author

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

Presentation materials