Symmetrization selection rules

We introduce strong and electromagnetic interaction selection rules for the two-body decay and production of exotic JPC = 0+−, 1−+, 2+−, 3−+,… hybrid mesons, four-quark states and glueballs. The rules arise from symmetrization in states. Examples include various decays to η′η, ηπ, η′π and π±π0. The symmetrization rules can discriminate between hybrid and four-quark interpretations of a 1−+ signal.