Mass limits for heavy neutrinos

Details Mass limits for heavy neutrinos Mass limits for heavy neutrinos

2007-10-22

arxiv.org/abs/0710.3893v2

Astronomy and Astrophysics

Astrophysics

8 pages, 10 figures (Major revision)

Scientific paper

10.1051/0004-6361:20078898

Neutrinos heavier than $M_Z/2\sim 45$ GeV are not excluded by particle physics data. Stable neutrinos heavier than this might contribute to the cosmic gamma ray background through annihilation in distant galaxies as well as to the dark matter content of the universe. We calculate the evolution of the heavy neutrino density in the universe as a function of its mass, $M_N$, and then the subsequent gamma ray spectrum from annihilation of distant $N\bar{N}$ (from $0

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