New hadron configuration: The double-gluon hybrid state

This is the first study on the double-gluon hybrid, which consists of one valence quark and one valence antiquark together with two valence gluons. We concentrate on the one with the exotic quantum number JPC = 2+- that conventional q over bar q mesons cannot reach. We apply the QCD sum rule method to evaluate its mass to be 2.26+0.20 -0.25 GeV, and study its possible decay patterns. Especially, its three-meson decay patterns are generally not suppressed severely compared to two-meson decay patterns, so the S-wave three-meson decay channels f1 omega pi=f 1 rho pi can be useful in identifying its nature, which is of particular importance to the direct test of QCD in the low energy sector.

Automated summary

This study is the first to investigate the double-gluon hybrid and its decay patterns. The mass of this hybrid is determined using the QCD sum rule method, and its decay modes are studied. It is found that the three-meson decay patterns are crucial in identifying the nature of this hybrid.