Master thesis defence by Eva Brottmann Hansen – University of Copenhagen

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Master thesis defence by Eva Brottmann Hansen

Early Atmopheric Muon Rejection with IceCube PINGU

The development of a generic event selection for the Precision IceCube Next Generation Upgrade (PINGU) is presented. PINGU is a planned infill extension to the IceCube Neutrino Observatory at the South Pole, designed to lower the energy threshold of IceCube to ~1 GeV. With the PINGU subarray, IceCube will perform precision measurements of the atmospheric neutrino oscillation parameters, θ23 and Δ32, and determine the neutrino mass ordering at 3σ, significance with 4 years of data. The cosmic ray induced muon flux constitutes the largest source of background for neutrino searches with IceCube at the trigger level. To demonstrate the physics reach of PINGU, the detector's ability to reject the this background must be addressed. This thesis presents a set of algorithms, developed to identify and reject events caused by atmospheric muons at the earliest levels of data processing. At the final level, a muon rejection factor of 105 is achieved, which is needed to reduce the muon rate below the total neutrino rate.