Quarkonium $h$ States As Arbiters of Exoticity

Richard F. Lebed, Eric S. Swanson

The mass splitting between the quarkonium spin-singlet state $h$ ($J^{PC}=1^{+-}$) and the spin average of the quarkonium spin-triplet states $\chi$ ($J^{PC} = 0^{++}, 1^{++}, 2^{++…