Highly-boosted dark matter and cutoff for cosmic-ray neutrinos through neutrino portal
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2 Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea **
* e-mail: email@example.com
** After the talk, the affiliation was changed from IHEP to KAIST.
Published online: 10 May 2019
We study the cutoff for the cosmic-ray neutrino, set by the scattering with cosmic background neutrinos into dark sector particles through a neutrino portal interaction. We find that a large interaction rate is still viable, when the dark sector particles are mainly coupled to the τ-neutrino, so that the neutrino mean free path can be reduced to be O(10) Mpc over a wide energy range. If stable enough, the dark sector particle, into which most of the cosmic-ray neutrino energy is transferred, can travel across the Universe and reach the earth. The dark sector particle can carry the energy as large as O(EeV) if it originates from a cosmogenic neutrino.
© The Authors, published by EDP Sciences, 2019
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