New Constraints on the Origin of Medium-Energy Neutrinos Observed by IceCube. (arXiv:2002.07192v1 [hep-ph])

New Constraints on the Origin of Medium-Energy Neutrinos Observed by IceCube. (arXiv:2002.07192v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Capanema_A/0/1/0/all/0/1">Antonio Capanema</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Esmaili_A/0/1/0/all/0/1">Arman Esmaili</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Murase_K/0/1/0/all/0/1">Kohta Murase</a>

Any conceivable scenario for the origin of high-energy cosmic neutrinos,
observed by the IceCube neutrino detector at the South Pole, predicts the
generation of accompanied high-energy $gamma$ rays. Propagation of high-energy
photons over cosmological distances initiates an electromagnetic cascade that
degrades their energy to $lesssim1$ TeV energies, contributing to the
extragalactic $gamma$-ray background (EGB) observed by the Fermi-LAT
experiment. By taking into account various established components of the EGB,
as well as the latest IceCube shower data in the 10-100 TeV range, we derive
new multimessenger bounds on the properties of their sources. We find that
conventional scenarios suffer from a tension at $gtrsim3sigma$ level for a
neutrino flux extending down to $10$ TeV, which is interpreted as evidence for
a new class of sources that prohibit $gamma$ rays from escaping them or have
redshift evolution significantly different from the cosmic star formation rate.

Any conceivable scenario for the origin of high-energy cosmic neutrinos,
observed by the IceCube neutrino detector at the South Pole, predicts the
generation of accompanied high-energy $gamma$ rays. Propagation of high-energy
photons over cosmological distances initiates an electromagnetic cascade that
degrades their energy to $lesssim1$ TeV energies, contributing to the
extragalactic $gamma$-ray background (EGB) observed by the Fermi-LAT
experiment. By taking into account various established components of the EGB,
as well as the latest IceCube shower data in the 10-100 TeV range, we derive
new multimessenger bounds on the properties of their sources. We find that
conventional scenarios suffer from a tension at $gtrsim3sigma$ level for a
neutrino flux extending down to $10$ TeV, which is interpreted as evidence for
a new class of sources that prohibit $gamma$ rays from escaping them or have
redshift evolution significantly different from the cosmic star formation rate.

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