Sub-GeV dark matter that interacts hadronically is ruled out for nucleon scattering cross sections above 10^{-36} cm² across the keV to 100 MeV mass range by combined cosmological and particle-decay constraints.
C A u +C A d + 4 (C A u −C A d ) 1− 16B0L4 f2 X q mq + 16B0L5 f2 (C A u mu −C A d md) ! q2 12 −m 2 π q2 12 −m 2 π0 # +g S 8 X q C A q , (C12) CA π =g 8
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Irreducible Constraints on Hadronically Interacting Sub-GeV Dark Matter
Sub-GeV dark matter that interacts hadronically is ruled out for nucleon scattering cross sections above 10^{-36} cm² across the keV to 100 MeV mass range by combined cosmological and particle-decay constraints.