Physics – High Energy Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..444..105w&link_type=abstract
First tropical workshop on particle physics and cosmology and the second Latin American symposium on high energy physics. AIP C
Physics
High Energy Physics
2
Cosmic Rays, Neutrino Interactions
Scientific paper
The observation of cosmic-ray events above the Greisen-Kuzmin-Zatsepin (GZK) cutoff of 5×1019 eV challenges orthodox modeling. We discuss a possible solution which uses Standard Model (SM) physics augmented only by <~ eV neutrino masses as suggested by solar, atmospheric, and terrestrial neutrino detection and the cosmological preference for a hot dark matter component. In this scheme, cosmic ray neutrinos from distant, highest-energy sources annihilate relatively nearby on the relic-neutrino background to produce ``Z-bursts'', highly-collimated, highly-boosted (γZ~1011) hadronic jets. ¿From the SM and hot Big Bang cosmology, the probability for each neutrino flavor at its resonant energy to annihilate within the halo of our galactic supercluster is likely within an order of magnitude of 1%. The kinematics of the annihilation are completely determined by the neutrino masses and the properties of the Z boson. The burst energy is ER=4 (eV/mν)×1021 eV, and the burst content includes, on average, thirty photons and 2.7 nucleons with super-GZK energies. Several tests of the neutrino annihilation hypothesis are indicated.
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