Measurement of the Astrophysical Neutrino Flux using Muon Neutrinos in IceCube

The IceCube Neutrino Observatory is a cubic kilometer-sized detector designed to detect astrophysical neutrinos. However, cosmic rays interacting in the atmosphere produce a significant number of muons in the southern equatorial sky. We show a dataset with a large background rejection and high signal efficiency resulting in ~10,000 neutrinos expected per year and negligible muon rates. In particular, this dataset is dominated by muon neutrino events with contained vertex.  The events in this selection have an energy resolution of ~13% and a median angular resolution of 1.5degrees at 1TeV and 0.5degrees at 1 PeV. This dataset is also effective at rejecting atmospheric neutrinos that are often accompanied with muons; this self-veto effect allows us to measure the astrophysical flux at low energies above 1 TeV. Today we use this new dataset to measure the diffuse astrophysical neutrino flux including systematic uncertainties using 10 years of IceCube data.