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.
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2009 Jan 19|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics