You are here: Home / Seminars / Seminar Database / HEP Seminar: Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events)

HEP Seminar: Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events)

Main Content

Ranjan Laha, Ohio State University
When
29 January 2014 from 2:30 PM to 3:30 PM
Where
339 Davey Laboratory
Contact Name
Contact Phone
814-863-5943
Add event to calendar
vCal
iCal

The IceCube neutrino observatory has detected two cascade events with energies near 1 PeV. Without invoking new physics, we analyze the source of these neutrinos. We show that atmospheric conventional neutrinos and cosmogenic neutrinos (those produced in the propagation of ultra-high- energy cosmic rays) are strongly disfavored. For atmospheric prompt neutrinos or a diffuse background of neutrinos produced in astrophysical objects, the situation is less clear. We show that there are tensions with observed data, but that the details depend on the least-known aspects of the IceCube analysis. Very likely, prompt neutrinos are disfavored and astrophysical neutrinos are plausible. We demonstrate that the fastest way to reveal the origin of the observed PeV neutrinos is to search for neutrino cascades in the range below 1 PeV, for which dedicated analyses with high sensitivity have yet to appear, and where many more events could be found.

Seminars