The spin and parity of the $Z_c(3900)^pm$ state are determined to be
$J^P=1^+$ with a statistical significance larger than $7sigma$ over other
quantum numbers in a partial wave analysis of the process $e^+e^- o
pi^+pi^-J/psi$. We use a data sample of 1.92 fb$^{-1}$ accumulated at
$sqrt{s}=4.23$ and 4.26 GeV with the BESIII experiment. When parameterizing
the $Z_c(3900)^pm$ with a Flatte-like formula, we determine its pole mass
$M_ extrm{pole}=(3881.2pm4.2_ extrm{stat}pm52.7_ extrm{syst}) extrm{MeV}/c^2$
and pole width
$Gamma_ extrm{pole}=(51.8pm4.6_ extrm{stat}pm36.0_ extrm{syst}) extrm{MeV}$.
We also measure cross sections for the process $e^+e^- o
Z_c(3900)^+pi^-+c.c. o J/psipi^+pi^-$ and determine an upper limit at the
90\% confidence level for the process $e^+e^- o Z_c(4020)^+pi^-+c.c. o
J/psipi^+pi^-$.
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