IceCube High Energy Starting Events at 7.5 Years -- New Measurements of Flux and Flavor

Abstract

The IceCube Neutrino Observatory at the South Pole, which detects Cherenkov light from charged particles produced in neutrino interactions, firmly established the existence of an astrophysical high-energy neutrino component. Here I present IceCube's High-Energy Starting Event sample and the new results obtained with a livetime of about 7.5 years. I will focus on the new measurement of the flavor composition performed using this sample. IceCube is directly sensitive to each neutrino flavor via the single cascade, track and double cascade event topologies, the latter being the topology produced in tau-neutrino interactions above an energy threshold of ~100 TeV. A measurement of the flavor ratio on Earth can provide important constraints on sources and production mechanisms within the standard model, and also constrain various beyond-standard-model processes.

arXiv commentProceeding for the VLVNT2018 Conference

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• Hunting the Glashow Resonance with PeV Neutrino Telescopes
• Charged Higgs effects in IceCube: PeV events and NSIs
• Neutrino Production Associated with Late Bumps in Gamma-Ray Bursts and Potential Contribution to Diffuse Flux at IceCube
• Light, Unstable Sterile Neutrinos: Phenomenology, a Search in the IceCube Experiment, and a Global Picture
• Sterile Neutrino Searches at the IceCube Neutrino Observatory
• Inferring astrophysical neutrino sources from the Glashow resonance
• Status and Perspectives of Neutrino Physics
• Neutrinos and strong interactions: QCD (and beyond?)