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 (P HANSEN PERTENECE A LA COLABORACIÓN AUGER)

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2016 vol. 37 p. 1 - 31

1475-7516

This paper presents the results of dierent searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first consider samples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which provided 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 the neutrino arrival directions and adopting dierent assumptions on the size of the UHECR magnetic deections. Finally, we perform another likelihood analysis stacking the UHECRdirections and using a sample of through-going muon tracks optimized for neutrino pointsource 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.