The meson as a tetraquark state

Abstract: We test the validity of the QCD sum rules applied to the meson , by considering a diquark–antidiquark type of current with and with . We find that, with the studied currents, it is possible to find an acceptable Borel window. In such a Borel window we have simultaneously a good OPE convergence and a pole contribution which is bigger than the continuum contribution. We get and for the currents with and , respectively. We conclude that the QCD sum rules results favors quantum numbers for the meson. [Copyright &y& Elsevier]