Abstract
Ultrahigh energy neutrinos scatter on relic neutrinos producing Z bosons, which can decay hadronically producing protons (Z burst). We compare the predicted proton spectrum with the observed ultrahigh energy cosmic ray (UHECR) spectrum and determine the mass of the heaviest via a maximum likelihood analysis. Our prediction depends on the origin of the powerlike part of the UHECR spectrum: for Galactic halo and for extragalactic origin. The necessary flux should be detected in the near future.
- Received 8 May 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.171101
©2002 American Physical Society