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A combined maximum-likelihood analysis of the high-energy astrophysical neutrino flux measured with IceCube

Abstract:

With the completion of the IceCube detector in 2010 December, a decade-long journey toward building a kilometerscale neutrino detector was finally concluded (for a review see, eg, Spiering 2012). Using this instrument, we aimed to detect the first extraterrestrial neutrinos, and thus to explore territories previously inaccessible to astronomy. These neutrinos have now been detected: in Aartsen et al.(2013, 2014e), the IceCube Collaboration presented the first evidence for a flux of highenergy extraterrestrial neutrinos, based on a search for events that start and deposit 30 TeV inside the detection volume of IceCube. Indications for this flux had already been found in earlier analyses performed on data taken during the construction phase of IceCube (Schönwald et al. 2013; Aartsen et al. 2014c, 2014d). More recently, the flux was measured down to deposited energies of 10 TeV (Aartsen et al. 2015a), and evidence …