Phys. Rev. Lett. 88, 171101 (2002) [4 pages]Determination of Absolute Neutrino Masses from Bursts of Z Bosons in Cosmic Rays |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1984: |
Z. Fodor1,2, S. D. Katz2, and A. Ringwald1
1Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607, Hamburg, Germany
2Institute for Theoretical Physics, Eötvös University, Pázmány 1, H-1117 Budapest, Hungary
Received 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+1.28 eV for Galactic halo and 0.26-0.14+0.20 eV for extragalactic origin. The necessary UHEν flux should be detected in the near future.
©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v88/e171101
DOI: 10.1103/PhysRevLett.88.171101
PACS: 98.70.Sa, 14.60.Pq, 95.35.+d, 96.40.Tv
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