TY  - JOUR
AU  - Coito, L.
AU  - Faubel, C.
AU  - Herrero-Garcia, J.
AU  - Santamaria, A.
PY  - 2021
DA  - 2021//
TI  - Dark matter from a complex scalar singlet: the role of dark CP and other discrete symmetries
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 202
EP  - 34pp
VL  - 11
IS  - 11
PB  - Springer
KW  - Beyond Standard Model
KW  - Cosmology of Theories beyond the SM
AB  - We study the case of a pseudo-scalar dark matter candidate which emerges from a complex scalar singlet, charged under a global U(1) symmetry, which is broken both explicitly and spontaneously. The pseudo-scalar is naturally stabilized by the presence of a remnant discrete symmetry: dark CP. We study and compare the phenomenology of several simplified models with only one explicit symmetry breaking term. We find that several regions of the parameter space are able to reproduce the observed dark matter abundance while respecting direct detection and invisible Higgs decay limits: in the resonances of the two scalars, featuring the known as forbidden or secluded dark matter, and through non-resonant Higgs-mediated annihilations. In some cases, combining different measurements would allow one to distinguish the breaking pattern of the symmetry. Moreover, this setup admits a light DM candidate at the sub-GeV scale. We also discuss the situation where more than one symmetry breaking term is present. In that case, the dark CP symmetry may be spontaneously broken, thus spoiling the stability of the dark matter candidate. Requiring that this does not happen imposes a constraint on the allowed parameter space. Finally, we consider an effective field theory approach valid in the pseudo-Nambu-Goldstone boson limit and when the U(1) breaking scale is much larger than the electroweak scale.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2106.05289
UR  - https://doi.org/10.1007/JHEP11(2021)202
DO  - 10.1007/JHEP11(2021)202
LA  - English
N1  - WOS:000723081600002
ID  - Coito_etal2021
ER  -