Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 96: Neutrinoastronomie III

T 96.1: Talk

Thursday, March 12, 2015, 16:45–17:00, I.12.02 (HS 31)

The Impact of the Ice Model on Tau Neutrino Reconstruction in IceCube — •Marcel Usner and Marek Kowalski for the IceCube collaboration — DESY Zeuthen

The IceCube Neutrino Observatory at the South Pole is a Cherenkov detector with an instrumented volume of about one cubic kilometer of the Antarctic ice. Tau neutrinos can be measured via the double bang signature that links two subsequent cascades from the neutrino interaction and the tau decay. Reconstruction of double bang events is currently limited to PeV energies and above where the decay length of the tau is greater than 50m. At lower energies it is important to consider small effects that affect the propagation of Cherenkov photons in the ice. The most recent model of the glacial ice below South pole contains a tilt of the ice layers and an anisotropy of the scattering coefficient in the direction of the glacier flow. These effects cannot be incorporated trivially into the existing reconstruction methods and can have a significant impact on single and double cascade reconstruction. Updates on finding a solution to this problem will be presented and the effect on the reconstruction of tau neutrino events will be discussed.