QCD sum rule study of the tensor $\hat{I}{”}^0\hat{I}{”}^0$ dibaryon state

Abstract

We study the exotic $\hat{I}{”}^0\hat{I}{”}^0$ dibaryon state with quantum numbers $J^P=2^{+}$ within the framework of QCD sum rules. A tensor interpolating current is constructed to determine the mass and residue of this state, including explicit calculations of contributions from quark, gluon, and mixed vacuum condensates up to dimension nine. The numerical analysis yields a mass of $m_{\hat{I}{”}^0\hat{I}{”}^0}=2426_{-108}^{+101}\mathrm{MeV}$ and a residue of $f_{\hat{I}{”}^0\hat{I}{”}^0}=\left(2.30_{-0.45}^{+0.49}\right)\times 10^{-4}{\mathrm{GeV}}^8$. The predicted mass lies about $38\mathrm{MeV}$ below the $2m_{\hat{I}{”}^0}$ threshold, which indicates the possible existence of a bound molecular configuration. Consequently, the tensor $\hat{I}{”}^0\hat{I}{”}^0$ dibaryon may serve as a promising candidate for future experimental searches.

11 Pages, 2 Figures and 1 Table