Scattering of ultrahigh-energy (UHE) extragalactic neutrinos onto light relic neutrinos in galactic HDM halo overcoming the GZK cutoff - INSPIRE

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Scattering of ultrahigh-energy (UHE) extragalactic neutrinos onto light relic neutrinos in galactic HDM halo overcoming the GZK cutoff

Sep, 1998

5 pages

Part of Proceedings, 2nd International Workshop on The identification of dark matter (IDM 1998) : Buxton, UK, September 7-11, 1998, 597-603

Contribution to:

- IDM 1998
, 597-603

e-Print:

astro-ph/9902024 [astro-ph]

Report number:

INFN-1237

View in:

ADS Abstract Service

reference search4 citations

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Abstract: (arXiv)

The rarest cosmic rays above the GZK cut'off

(E_{CR} \tilde{>} 10^{19} \div 10^{20} eV)

are probably born at cosmic distances (

\tilde{>}

tens Mpc) by AGNs (QSRs, BLac, Blazars...). Their puzzling survival over

2.75 K^o

BBR radio waves opacities (the ``GZK cut off'') might find a natural explanation if the traveling primordial cosmic rays were UHE neutrinos (born by UHE photopion decay) which are transparent to

\gamma

or

\nu

BBR. These UHE

% \nu

might scatter onto those (light and cosmological) relic neutrinos clustered around our galactic halo. The branched chain reactions from a primordial nucleon (via photoproduction of pions and decay to UHE neutrinos) toward the consequent beam dump scattering on galactic relic neutrinos is at least three order of magnitude more efficient than any known neutrino interactions with Earth atmosphere or direct nucleon propagation. Therefore the rarest cosmic rays (as the 320 EeV event) might be originated at far

(\tilde{>} 100 Mpc)

distances (as Seyfert galaxy MCG 8-11-11). The needed UHE radiation power is in rough agreement with the NCG 8-11-11 observed in MeV gamma energy total output power. The final chain products observed on Earth by the Fly's Eye detector might be mainly neutron and antineutrons as well as, at later stages, protons and antiprotons. These hadronic products are most probably secondaries of

W^+ W^-

or

ZZ

pair productions and might be consistent with the last AGASA discoveries of 6 doublet and one triplet event.

talk: Buxton 1998/09/07
neutrino: cosmic radiation
neutrino neutrino: interaction
neutrino antineutrino: interaction
neutrino/tau
antineutrino/tau
W: pair production
Z0: neutrinoproduction
hadron: production
cross section: energy dependence

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Figures(0)

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