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

THE ICECUBE COLLABORATION; THE PIERRE AUGER COLLABORATION.; THE TELESCOPE ARRAY COLLABORATION; S. J. SCIUTTO

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2016 vol. 01 p. 37 - 72

1475-7516

This paper presents the results of dierent searches for correlations between veryhigh-energy neutrino candidates detected by IceCube and the highest-energy cosmic raysmeasured by the Pierre Auger Observatory and the Telescope Array. We rst considersamples of cascade neutrino events and of high-energy neutrino-induced muon tracks, whichprovided evidence for a neutrino ux of astrophysical origin, and study their cross-correlationwith 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 UHECRmagnetic deections. Finally, we perform another likelihood analysis stacking the UHECRdirections and using a sample of through-going muon tracks optimized for neutrino pointsourcesearches with sub-degree angular resolution. No indications of correlations at discoverylevel 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 thatshould continue to be monitored.