Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 81: Neutrino astronomy III

T 81.2: Talk

Thursday, April 2, 2020, 16:45–17:00, H-1.004

Improving IceCube low-energy event reconstruction — •Elisa Lohfink, Jan Weldert, and Sebastian Böser for the IceCube collaboration — Johannes Gutenberg-Universität Mainz

With the low-energy extension (DeepCore) of the IceCube Neutrino Observatory, neutrinos with energies down to the GeV range can be reconstructed individually. The reconstruction is based on minimizing an eight-dimensional likelihood, using tabulated charge expectation values at each optical module, for the entire range of possible light sources. Due to computational restrictions, this includes spline-interpolating between a finite number of possible sources as well as assuming symmetries of the light behavior in the ice, neglecting for instance the known ice anisotropy. Also, within reconstruction, particle track lengths are quantized and certain characteristics of the light emission are simplified. Motivated by the resolutions an ideal reconstruction would yield and by the improvements this implies for physics results, it is worthwhile to thoroughly understand the individual effects these simplifications have. Consequently, those having the largest impact are identified and the potential of using full available detail is evaluated.