Gluonic nature of the newly observed state $X(2600)$

TL;DR

This paper investigates whether the newly observed $X(2600)$ resonance can be interpreted as a trigluon glueball using QCD sum rules, providing mass estimates and decay channel analysis.

Contribution

It offers the first QCD sum rule analysis of the $X(2600)$ as a trigluon glueball, estimating its mass and exploring decay channels.

Findings

Mass of $2^{-+}$ trigluon glueball is about 2.66 GeV, matching $X(2600)$.

Mass of $0^{-+}$ trigluon glueball is about 2.01 GeV.

Decay channels of the $2^{-+}$ state are identified for experimental verification.

Abstract

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 $2.66\pm 0.06$ GeV, which is consistent with the mass of the X(2600) within the uncertainties, while $0^{-+}$ has a mass of $2.01\pm0.14$ 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.