$D$-wave dimeson resonance interpretation to the $Z_c/Z_{cs}/Z_b$ states

Abstract

In this work, we construct the $S$-wave, $P$-wave, and $D$-wave $D^{(\ast )}{\bar{D}}_{(s)}^{\ast }$/$B^{(\ast )}{\bar{B}}_{(s)}^{\ast }$ interactions by considering the lowest order contributions from the leading order (LO), next-to-leading order (NLO), and next-to-next-to-next-to-leading order (N${}^3$LO) contact terms, respectively. After solving the corresponding Lippmann-Schwinger equation (LSE), we obtain the typical pole trajectory for the $S$-wave/$P$-wave/$D$-wave state. We adjust the $P$-wave low energy constant (LEC) and {accordingly obtain a $P$-wave $D{\bar{D}}^{\ast }/D^{\ast }\bar{D}$} resonance state that may correspond to the observed $G(3900)$, { and its $P$-wave $D^{\ast }{\bar{D}}^{\ast }$ and $B^{(\ast )}{\bar{B}}^{\ast }$ partners are also predicted}. Then we proceed to adjust the $D$-wave LECs to looking for the $D$-wave $D^{(\ast )}{\bar{D}}_{(s)}^{(\ast )}$/$B^{(\ast )}{\bar{B}}_{(s)}^{(\ast )}$ resonances. The satisfactory consistencies between our results { and the experimental resonance parameters} of $Z_c(3900)$/$Z_c(4020)$, $Z_b(10610)$/$Z_b(10650)$, and $Z_{cs}(4000)$/$Z_{cs}(4220)$ indicate that the $D$-wave resonance interpretation may provide a unified picture to understand these { isovector charmoniumlike states. Especially, the broad width features of $Z_{cs}(4000)$ and $Z_{cs}(4220)$ can be naturally reproduced by interpreting them as $D$-wave $D{\bar{D}}_s^{\ast }$ and $D^{\ast }{\bar{D}}_s^{\ast }$ resonances, respectively.

Comments: 11 pages, 2 figures, 2 Tables