Abstract
In this article, we assume that there exist hidden charmed tetraquark states with spin–parity J P=1−, and we calculate their masses with the QCD sum rules. The numerical result indicates that the masses of the vector hidden charmed tetraquark states are about M Z =(5.12±0.15) GeV or M Z =(5.16±0.16) GeV, which are inconsistent with the experimental data on the π + χ c1 invariant-mass distribution. The hidden charmed mesons Z 1, Z 2 or Z may be scalar hidden charmed tetraquark states, hadro-charmonium resonances or molecular states.
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