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.

11.55.Hx
12.39.-x
12.38.Lg
Z(4430): mass
quantum chromodynamics: sum rule
molecule
tetraquark
Borel transformation
operator product expansion
current

References(38)

Figures(5)

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