Gluonic nature of the newly observed state X(2600)

Motivated by the newly observed resonance X(2600) by BESIII Collaboration, we examine the trigluon glueball interpretation for it in the framework of QCD sum rules. We evaluate the mass spectra of the trigluon glueballs with quantum numbers 0-+ and 2-+ up to dimension 8 condensate in the operator product expansion. Our numerical results indicate that the mass of the 2-+ trigluon glueball is about 2.66 +/- 0.06 GeV, which is consistent with the mass of the X(2600) within the uncertainties, while 0-+ has a mass of 2.01 +/- 0.14 GeV. The possible decay channels of the 2-+ state are analyzed, which are crucial in decoding X(2600)'s internal structure and are hopefully measurable in BESIII, BEllEII, PANDA, and LHCb experiments.

Automated summary

Motivated by the observation of the resonance X(2600) by BESIII Collaboration, this study examines the possibility of interpreting it as a trigluon glueball in the framework of QCD sum rules. The mass spectra of trigluon glueballs with quantum numbers 0-+ and 2-+ are evaluated, and the results indicate that the mass of the 2-+ trigluon glueball is consistent with the mass of X(2600), while the 0-+ mass is slightly lower. The potential decay channels of the 2-+ state are also analyzed, which are important for understanding the internal structure of X(2600).