Light Thermal Dark Matter Beyond $p$-Wave Annihilation in Minimal Higgs Portal Model
| Title: | Light Thermal Dark Matter Beyond $p$-Wave Annihilation in Minimal Higgs Portal Model |
|---|---|
| Authors: | Chen, Yu-Tong, Matsumoto, Shigeki, Tang, Tian-Peng, Tsai, Yue-Lin Sming, Wu, Lei |
| Publication Year: | 2024 |
| Collection: | Astrophysics High Energy Physics - Phenomenology |
| Subject Terms: | High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena |
| More Details: | This study explores a minimal renormalizable dark matter (DM) model, incorporating a sub-GeV Majorana DM and a singlet scalar particle $\phi$. Using scalar and pseudo-scalar interactions (couplings $c_s$ and $c_p$), 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 ($10 \,\rm{MeV} < m_\chi \lesssim m_\phi$) within the $2\sigma$ allowed region, we explore scenarios ($\left|c_s\right|\gg \left|c_p\right|$, $\left|c_s\right|\ll \left|c_p\right|$, and $\left|c_s\right|\approx \left|c_p\right|$). 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 $m_\chi>1\,\rm{GeV}$; (iii) the preferred $\phi$-resonance region can be tested in the future indirect detection experiments, such as e-ASTROGAM. Comment: 35 pages, 4 figures |
| Document Type: | Working Paper |
| Access URL: | http://arxiv.org/abs/2403.02721 |
| Accession Number: | edsarx.2403.02721 |
| Database: | arXiv |
| Description not available. |