Gluonic Hidden-charm Tetraquark States

In this paper, a new type of hybrid state, which consists of two valence quarks and two valence antiquarks together with a valence gluon, the gluonic tetraquark states, are investigated. Twenty-four currents of the the gluonic hidden-charm tetraquark states in [3̄c]c q⊗[8c]G⊗[3c]c̄ q^̄ configuration are constructed, and their mass spectrum are evaluated in the framework of QCD sum rules with quantum numbers of JP=0⁺, 0⁻, 1⁻, and 1⁺. The nonperturbative contributions up to dimension 8 are taken into account. The results indicate that there may be exist 14 gluonic hidden-charm tetraquark states, and their corresponding hidden-bottom partners are also evaluated. The possible production and decay modes of the gluonic tetraquark states are analyzed, which are hopefully measurable in BESIII, BELLEII, PANDA, Super-B, and LHCb experiments.