Kavli Affiliate: Shigeki Matsumoto
| First 5 Authors: Yu-Tong Chen, Shigeki Matsumoto, Tian-Peng Tang, Yue-Lin Sming Tsai, Lei Wu
| Summary:
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
$2sigma$ allowed region, we explore scenarios ($left|c_sright|gg
left|c_pright|$, $left|c_sright|ll left|c_pright|$, and
$left|c_sright|approx left|c_pright|$). 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.
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