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A narrow structure in the $p\bar{\Lambda}$ system near the mass threshold,named as $X(2085)$, is observed in the process $e^+e^- \to p K^-\bar{\Lambda}$with a statistical significance greater than $20\sigma$. Its spin and parityare determined for the first time to be $J^P=1^+$ in an amplitude analysis,with statistical significance greater than $5\sigma$ over other quantumnumbers. The pole positions of $X(2085)$ are measured to be $M_{\rmpole}=(2086\pm4\pm6)$~MeV and $\Gamma_{\rm pole}=(56\pm5\pm16)$ MeV, where thefirst uncertainties are statistical and the second ones are systematic. Theanalysis is based on the study of the process $e^+e^-\to pK^-\bar{\Lambda}$ anduses the data samples collected with the BESIII detector at the center-of-massenergies $\sqrt{s}=4.008$, $4.178$, $4.226$, $4.258$, $4.416$, and $4.682$ GeVwith a total integrated luminosity of $8.35~\text{fb}^{-1}$.

Determination of Spin-parity Quantum Numbers for the Narrow Structure Near the $p\bar{\Lambda}$ Threshold in $e^+e^-\to pK^-\bar{\Lambda}+c.c.$