Abstract
We present the results of three searches for correlations between ultra-high energy cosmic ray measured by Telescope Array and the Pierre Auger Observatory and neutrino candidate 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 tracks. The angular separation between the arrival directions of neutrinos and UHECRs is scanned. The same 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 that was optimized for neutrino point source searches.
Highlights
This work describes a joint analysis by the IceCube, Pierre Auger and Telescope Array Collaborations to search for angular correlations between the arrival directions of high-energy νs and ultra-high energy cosmic rays (UHECRs)
As an a posteriori study, we evaluated the significance under the hypothesis of an isotropic distribution of neutrinos, fixing the UHECR arrival directions
Three analyses have been performed to investigate correlations between UHECRs detected by the Pierre Auger Observatory and Telescope Array with various samples of IceCube ν candidates
Summary
If the CR composition is light i.e. mainly protons, the magnetic deflection may be only a few degrees at energies above a few tens of EeV. Secondary particles including neutrinos (νs) are produced in the sources by the interactions between the CRs and ambient photon and matter fields. Neutrinos have no charge and interact only through the weak force, so their arrival directions do point back to where they originated from, even though they are hard to detect. This work describes a joint analysis by the IceCube, Pierre Auger and Telescope Array Collaborations to search for angular correlations between the arrival directions of high-energy νs and UHECRs
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