Speaker
Yongchao Zhang
(Southeast University)
Description
We derive conservative model independent limits on the dark-matter–nucleon scattering cross section for sub-GeV dark matter. The leading-order hadronic couplings are most severely constrained by the supernova cooling argument via processes such as nucleon bremsstrahlung and pion–DM conversion. We rule out both spin-independent and spin-dependent cross sections larger than roughly $10^{−50}$ cm$^2$ for DM masses in the MeV to few hundred MeV range, which are several orders of magnitude stronger than existing cosmological and meson decay constraints. This has significant implications for future low-mass direct detection experiments.
Primary authors
Yongchao Zhang
(Southeast University)
Dr
Zun Wang
