Abstract
This study explores a minimal renormalizable dark matter (DM) model, incorporating a sub-GeV Majorana DM and a singlet scalar particle ϕ. Using scalar and pseudo-scalar interactions (couplings cs and cp), we investigate implications for DM detection, considering s-wave, p-wave, and combined (s+p wave) contributions in DM annihilation cross-section, as well as loop-correction contributions to DM-nucleon elastic scattering. Identifying a broad parameter space (10 MeV < mχ ≲ mϕ) within the 2σ allowed region, we explore scenarios (|cs| ≫ |cp|, |cs| ≪ |cp|, and |cs| ≈ |cp|). We find that (i) a non-zero pseudo-scalar coupling alleviates direct detection constraints as a comparison with the previous pure scalar coupling case; (ii) CMB observations set stringent limits on pseudo-scalar interaction dominant cases, making s-wave annihilation viable only for mχ > 1 GeV; (iii) the preferred ϕ-resonance region can be tested in the future indirect detection experiments, such as e-ASTROGAM.
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Acknowledgments
We express our gratitude to Mei-Wen Yang for her invaluable numerical support. YST is supported by the National Key Research and Development Program of China (No. 2022YFF0503304), and the Project for Young Scientists in Basic Research of the Chinese Academy of Sciences (No. YSBR-092). LW is supported by the National Natural Science Foundation of China (NNSFC) No. 12275134, No. 12335005, and No. 12147228. SM is supported by Grant-in-Aid for Scientific Research from the MEXT, Japan (20H01895, 20H00153, 19H05810, 18H05542, JPJSCCA20200002) and by World Premier International Research Center Initiative (WPI), MEXT, Japan (Kavli IPMU).
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Chen, YT., Matsumoto, S., Tang, TP. et al. Light thermal dark matter beyond p-wave annihilation in minimal Higgs portal model. J. High Energ. Phys. 2024, 281 (2024). https://doi.org/10.1007/JHEP05(2024)281
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DOI: https://doi.org/10.1007/JHEP05(2024)281