We study phenomenology of a light scalar dark matter (DM). In the model, there is an inert doublet scalar and a singlet Dirac fermion , both charged under a global symmetry. The mass of the lightest inert scalar can be lighter than 10 GeV by imposing appropriate relations between three scalar quartic couplings. The lightest odd particle is stable and DM. In this paper, focusing on the parameter space where is lighter than and is DM, we discuss DM physics related to relic density, direct detection, indirect detection, collider searches, and other cosmological observations. We clarify differences from the case where is instead DM, which has been focused on in previous works.
- Received 5 December 2023
- Accepted 11 March 2024
DOI:https://doi.org/10.1103/PhysRevD.109.075007
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society
Particles & Fields
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