Svenja Hümmer, Philipp Baerwald, Walter Winter
We review the neutrino flux from gamma-ray bursts, which is estimated from
gamma-ray observations and used for the interpretation of recent IceCube data,
from a particle physics perspective. We numerically calculate the neutrino flux
for the same astrophysical assumptions as the analytical fireball neutrino
model, including the dominant pion and kaon production modes, flavor mixing,
and magnetic field effects on the secondary muons, pions, and kaons. We
demonstrate that taking into account the full energy dependencies of all
spectra, the normalization of the expected neutrino flux reduces by about one
order of magnitude and the spectrum shifts to higher energies, where we can pin
down the exact origin of the discrepancies by the re-computation of the
analytical models. We also reproduce the IceCube-40 analysis for exactly the
same bursts and same assumptions and illustrate the impact of systematical
uncertainties. We conclude that the baryonic loading of the fireballs, which is
an important control parameter for the emission of cosmic rays, can be
constrained beyond the expectation with the full-scale experiment after about
nine years.
View original:
http://arxiv.org/abs/1112.1076
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