Ponente
Descripción
The Glashow resonance describes the resonant production of a W− boson during
the interaction of an electron antineutrino with an electron.
The cross-section of this process peaks at an antineutrino energy of 6.3 petaelectronvolts (PeV) in the rest frame of the electron.
In this talk, I will report on the observation by the IceCube Neutrino Observatory of a neutrino-induced particle shower with a deposited energy of ~6 PeV. A detailed study of the event revealed features in the PMT waveforms, which are consistent with the production of secondary muons in the particle shower. While these muons confirm the hadronic nature of the particle shower - as expected from the decay of a W- boson -,they also enable an independent verification of the directional reconstruction of the primary neutrino.
This evidence for the Glashow resonance demonstrates the presence of electron antineutrinos in the astrophysical flux.
While currently limited by statistics, this work demonstrates the feasibility of measuring the astrophysical anti-electron neutrino flux in future neutrino telescopes. By disentangling neutrinos from antineutrinos, it becomes possible to distinguish astronomical accelerators that produce neutrinos via hadronuclear or photohadronic interactions with or without strong magnetic fields.
