Correlation between the UHECRs measured by the Pierre Auger Observatory and Telescope Array and neutrino candidate events from IceCube
1 Département de physique nucléaire et corpusculaire, Université de Genève, 24 Quai Ernest Ansermet, 1211 Genève, Switzerland
2 Centro Atómico Bariloche, Av. Bustillo 9500, S. C. de Bariloche 8400, Argentina
3 Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris, France
4 Karlsruhe Institute of Technology – Campus North – Institut fër Kernphysik, Karlsruhe, Germany and New York University, New York, USA
5 Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, Japan
6 Service de Physique Théorique, Université Libre de Bruxelles, Boulevard du Triomphe (Campus de la Plaine), Ixelles 1050, Belgium
a e-mail: Mohamed.Rameez@unige.ch
Published online: 11 April 2016
We present the results of three searches for correlations between ultra-high energy cosmic ray events measured by Telescope Array and the Pierre Auger Observatory and high-energy neutrino candidate events from IceCube. Two cross-correlation analyses of ultra-high energy cosmic rays are done: one with 39 “cascades” from the IceCube “high-energy starting events” sample and the other one with 16 high-energy “tracks”. The angular separation between the arrival directions of neutrinos and UHECRs is scanned. The same events are also used in a separate search stacking the neutrino arrival directions and using a maximum likelihood approach. We assume that UHECR magnetic deflections are inversely proportional to the energy with values 3∘, 6∘ and 9∘ at 100 EeV to account for the uncertainties in the magnetic field strength and UHECR charge. A similar analysis is performed on stacked UHECR arrival directions and the IceCube 4-year sample of through-going muon-track events that was optimized for neutrino point source searches.
© Owned by the authors, published by EDP Sciences, 2016
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