Decay widths of Z _cs (3985/4000) based on rigorous quark-hadron duality*

Abstract

In this work, we explore the hadronic coupling constants $G_{ZJ/\psi K}$, $G_{Z\eta_c K^*}$, $G_{ZD^* \bar{D}_s}$ of the exotic states $Z_{cs}(3985/4000)$ both in the pictures of the tetraquark states and molecular states with the tentative assignments $J^{PC}=1^{+-}$ based on the rigorous quark-hadron duality. Then we obtain the total widths $\Gamma_{Z_{cs}}^T =15.31\pm 2.06\,\rm{MeV}$ and $\Gamma_{Z_{cs}}^M=83.51\pm21.09\,\rm{MeV}$, which are consistent with the experimental data $13.8^{+8.1}_{-5.2}\pm4.9\,\rm{MeV}$ from the BESIII collaboration and $131 \pm 15 \pm 26\,\rm{MeV}$ from the LHCb collaboration, respectively, and support assigning the $Z_{cs}(3985)$ and $Z_{cs}(4000)$ to be the hidden-charm tetraquark state and molecular state with the $J^{PC}=1^{+-}$, respectively.

Strange cousin of Z c (4020/4025) as a tetraquark state*

“…The most significant state, , had a Breit-Wigner mass and width of and , respectively, and the spin-parity [18]. Although we can reproduce the mass of using QCD sum rules in the pictures of both the tetraquark and molecular states [19][20][21][22][23][24][25][26], direct calculations of the decay widths based on QCD sum rules support assigning and and are cousins and have analogous decay modes.…”

Observation of a Charged Charmoniumlike Structure in e+e−→π+π−J/ψ at s=4.26 GeV

“…There are still ongoing debates on whether these particles are the same state or not [41,[45][46][47][48][49][50][51][52]. Therefore, to enhance our comprehension of these Z cs states and explore the possibility of new Z cs states, it is imperative to conduct further measurements of e + e − → KZ cs → K KJ/ψ [39,47,[51][52][53][54][55][56] In this Letter, a measurement of the Born cross sections of the process e + e − → K + K − J/ψ is presented at center-of-mass (c.m.) energies from 4.61 to 4.95 GeV [57], corresponding to an integrated luminosity of 5.85 fb −1 [58].…”

Zcs (4000)+ and Zcs (4220)+ in a Multiquark Color Flux-Tube Model

“…[8][9][10][11][12][13][14][15][16] Especially, whether the states 𝑍𝑐𝑠(3895) − and 𝑍𝑐𝑠(4000) + are two different states or not and how to understand their inner structures have attracted wide attention from the theoretical side. [17][18][19][20] Their most popular interpretation is describing them as two different pictures: compact tetraquark states with different 𝐽 𝑃 (Refs. [8,11]) or molecular states 𝐷𝐷 * 𝑠 and 𝐷 * 𝐷𝑠.…”