Abstract
The coupling of a neutral hybrid {1, 3, 5 …}−+ exotic particle (or current) to two neutral (hybrid) meson particles with the same JPC and J = 0 is proved to be sub‐leading to the usual large‐Nc QCD counting. The coupling of the same exotic particle to certain two — (hybrid) meson currents with the same JPC and J = 0 is also sub‐leading. The decay of a {1, 3, 5 …}−+ hybrid to ηπ0, η′π0, η′η, η(1295)π0, π(1300)0π0, η(1440)π0, a0(980)0σ or f0(980)σ is sub‐leading, assuming that these final state particles are (hybrid) mesons in the limit of large Nc.
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