Freeze-in sterile neutrino dark matter in a feebly gauged B-L model

2024/03/31 by Osamu Seto, Seto, Osamu, Takashi Shimomura +3 · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Particle physics theoretical and experimental studies #Cosmology and Gravitation Theories

paper · pdf · doi:10.48550/arxiv.2404.00654

Abstract

We consider the gauged U(1)_B-L model and examine the situation where the sterile neutrino is a dark matter candidate produced by the freeze-in mechanism. In our model, the dark matter N is mainly produced by the decay of a U(1)_B-L breaking scalar boson ϕ. We point out that the on-shell production of ϕ through annihilation of the U(1)_B-L gauge boson Z' plays an important role. We find that the single production of Z' from the gluon bath in the early Universe can become the main production modes for Z' in some parameter regions. To prevent N from being overproduced, we show that the U(1)_B-L gauge coupling constant g_B-L must be as small as 10^-16--10^-10. We also consider the case where the decay of ϕ into N is kinematically forbidden. In this case, N is generated by the scattering of Z' and the g_B-L takes values of 10^-10--10^-6, which can be explored in collider experiments like FASER and SHiP.

Cited by

• Leptogenesis and Dark Matter in an Inverse Seesaw from gauged B-L breaking

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