Here is a list of all documented enum values with links to the class documentation for each member:

keep_all : fastjet::Recluster
keep_only_hardest : fastjet::Recluster
SM_E : fastjet::SISConeSphericalPlugin
SM_Et : fastjet::SISConePlugin
SM_Etilde : fastjet::SISConeSphericalPlugin
SM_mt : fastjet::SISConePlugin
SM_pt : fastjet::SISConePlugin
SM_pttilde : fastjet::SISConePlugin