Phys. Rev. Lett. 88, 171101 (2002) [4 pages]Determination of Absolute Neutrino Masses from Bursts of Z Bosons in Cosmic RaysReceived 8 May 2001; revised 2 November 2001; published 16 April 2002 Ultrahigh energy neutrinos (UHEν) scatter on relic neutrinos (Rν) 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 Rν via a maximum likelihood analysis. Our prediction depends on the origin of the powerlike part of the UHECR spectrum: mν = 2.75-0.97+1.28eV for Galactic halo and 0.26-0.14+0.20eV for extragalactic origin. The necessary UHEν flux should be detected in the near future. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.171101
DOI:
10.1103/PhysRevLett.88.171101
PACS:
98.70.Sa, 14.60.Pq, 95.35.+d, 96.40.Tv
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