
TL;DR
This paper introduces the dark mediator Dark matter (dmDM) model where dark matter and its force carrier are charged under a new symmetry, leading to unique detection signals and astrophysical constraints.
Contribution
It proposes the dmDM model with light scalars coupling to the SM, systematically surveys experimental constraints, and explores detection prospects and astrophysical implications.
Findings
Neutron star cooling excludes minimal single-mediator models.
Two-mediator scenarios remain viable with strong detection signals.
dmDM can mimic different WIMP masses in experiments.
Abstract
In most models of the dark sector, dark matter is charged under some new symmetry to make it stable. We explore the possibility that not just dark matter, but also the force carrier connecting it to the visible sector is charged under this symmetry. This dark mediator then acts as a Double-Dark Portal. We realize this setup in the \emph{dark mediator Dark matter} model (dmDM), featuring a fermionic DM candidate with Yukawa couplings to light scalars . The scalars couple to SM quarks via the operator . This can lead to large direct detection signals via the process if one of the scalars has mass keV. For dark matter Yukawa couplings , dmDM features a thermal relic dark matter candidate while also implementing the SIDM scenario for…
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