We consider a hidden sector with new confining gauge theory similar to ordinary QCD, and show that the lightest mesons in the hidden sector (hidden sector pion h) are automatically stable as a consequence of flavor conservation of hidden sector strong interaction.There would be more than one neutral Higgs-like scalar bosons, and they could decay mainly into the CDM pair, if that decay channel is kinematically allowed.
Prof. KO, Pyungwon (KIAS)