Confirmation of a charged charmoniumlike state $Z_c(3885{)}^{\mp }$ in $e^{+}{e}^{-}\to {\pi }^{\pm }(D{\bar{D}}^{\ast }{)}^{\mp }$ with double $D$ tag

Abstract

We present a study of the process $e^{+}{e}^{-}\to {\pi }^{\pm }(D{\bar{D}}^{\ast }{)}^{\mp }$ using data samples of 1092~pb${}^{-1}$ at $\sqrt{s}=4.23$~GeV and 826~pb${}^{-1}$ at $\sqrt{s}=4.26$~GeV collected with the BESIII detector at the BEPCII storage ring. With full reconstruction of the $D$ meson pair and the bachelor ${\pi }^{\pm }$ in the final state, we confirm the existence of the charged structure $Z_c(3885{)}^{\mp }$ in the $(D{\bar{D}}^{\ast }{)}^{\mp }$ system in the two isospin processes $e^{+}{e}^{-}\to {\pi }^{+}{D}^0{D}^{\ast -}$ and $e^{+}{e}^{-}\to {\pi }^{+}{D}^{-}{D}^{\ast 0}$. By performing a simultaneous fit, the statistical significance of $Zc(3885{)}^{\mp }$ signal is determined to be greater than 10$\sigma$, and its pole mass and width are measured to be $M_{\mathrm{pole}}$=(3881.7$\pm$1.6(stat.)$\pm$1.6(syst.))~MeV/$c^2$ and ${\Gamma }_{\mathrm{pole}}$=(26.6$\pm$2.0(stat.)$\pm$2.1(syst.))~MeV, respectively. The Born cross section times the $(D{\bar{D}}^{\ast }{)}^{\mp }$ branching fraction ($\sigma (e^{+}{e}^{-}\to {\pi }^{\pm }{Z}_c(3885{)}^{\mp })\times Br(Z_c(3885{)}^{\mp }\to (D{\bar{D}}^{\ast }{)}^{\mp })$) is measured to be $(141.6\pm 7.9(\text{stat.})\pm 12.3(\text{syst.}))\text{pb}$ at $\sqrt{s}=4.23$~GeV and $(108.4\pm 6.9(\text{stat.})\pm 8.8(\text{syst.}))\text{pb}$ at $\sqrt{s}=4.26$~GeV. The polar angular distribution of the ${\pi }^{\pm }$-$Z_c(3885{)}^{\mp }$ system is consistent with the expectation of a quantum number assignment of $J^P=1^{+}$ for $Z_c(3885{)}^{\mp }$.

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