Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

THE PIERRE AUGER COLLABORATION (471 AUTHORS IN ALPHABETICAL ORDER); GARCIA, B

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2016 vol. 01 p. 1 - 35

1475-7516

This paper presents the results of dieferent searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic raysmeasured by the Pierre Auger Observatory and the Telescope Array. We first considersamples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which rovided evidence for a neutrino flux of astrophysical origin, and study their cross-correlation with the ultrahigh-energy cosmic ray (UHECR) samples as a function of angular separation.We also study their possible directional correlations using a likelihood method stacking theneutrino arrival directions and adopting dierent assumptions on the size of the UHECR magnetic deections. Finally, we perform another likelihood analysis stacking the UHECR directions and using a sample of through-going muon tracks optimized for neutrino point source searches with sub-degree angular resolution. No indications of correlations at discovery level are obtained for any of the searches performed. The smallest of the p-values comes fromthe search for correlation between UHECRs with IceCube high-energy cascades, a result that should continue to be monitored.