Analysis of the QQbar{Q}bar{Q} tetraquark states with QCD sum rules

Abstract

In this article, we study the J^{PC}=0^{++} and 2^{++}QQbar{Q}bar{Q} tetraquark states with the QCD sum rules, and we obtain the predictions M_{X(ccbar{c}bar{c},0^{++})} =5.99pm 0.08,mathrm {GeV}, M_{X(ccbar{c}bar{c},2^{++})} =6.09pm 0.08,mathrm {GeV}, M_{X(bbbar{b}bar{b},0^{++})} =18.84pm 0.09,mathrm {GeV} and M_{X(bbbar{b}bar{b},2^{++})} =18.85pm 0.09,mathrm {GeV}, which can be confronted to the experimental data in the future. Furthermore, we illustrate that the diquark–antidiquark type tetraquark state can be taken as a special superposition of a series of meson–meson pairs and that it embodies the net effects.