The meson Z+(4430) as a tetraquark state

We test the validity of the QCD sum rules applied to the meson Z+(4430), by considering a diquark-antidiquark type of current with JP=0− and with JP=1−. 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 mZ=(4.52±0.09)GeV and mZ=(4.84±0.14)GeV for the currents with JP=0− and JP=1−, respectively. We conclude that the QCD sum rules results favors JP=0− quantum numbers for the Z+(4430) meson.