About the exotic structure of $Z_{cs}$

Abstract

Very recently a new hadronic structure around $3.98$ GeV was observed in BESIII experiment. From its decay modes, it is reasonable for people to assign it to the category of exotic state, say $Z_{cs}^{+}$, the stranged-parter of $Z_c(3900)$. This finding indicates for the first time the exotic state with strange quark in charm sector, and hence has a peculiar importance. By virtue of the QCD Sum Rule technique, we analyze the $Z_{cs}^{+}$ about its possible configuration and physical properties, and find it could be configured as a mixture of two types of structures, $[1_c{]}_{\bar{c}u}\otimes [1_c{]}_{\bar{s}c}$ and $[1_c{]}_{\bar{c}c}\otimes [1_c{]}_{\bar{s}u}$, or $[3_c{]}_{\bar{c}u}\otimes [{\bar{3}}_c{]}_{\bar{s}c}$ and $[3_c{]}_{\bar{c}c}\otimes [{\bar{3}}_c{]}_{\bar{s}u}$, with $J^P=1^{+}$. Physically, it then appears to be the emergence of a compound of four possible currents in each configuration, which tells the single current evaluation of hadron spectroscopy and their decay properties are sometimes not enough. We find in both cases the energy spectra may fit well with the experimental observation, i.e. $3.98$ GeV, within the uncertainties, while noted the former is not favored by vector meson exchange model. Various $Z_{cs}^{+}(3980)$ decay modes are evaluated, which are critical for pinning down its configuration and left for experimental verification. We also predict the mass of $Z_{cs}^0$, the neutral partner of $Z_{cs}^{+}(3980)$, and analyze its dominant decay probabilities.

arXiv comment31 pages, 4 figures, a few expressions are amended

References in corpus (23)

• Observation of a charged charmoniumlike structure in e+e- to pi+pi-J/psi at \sqrt{s}=4.26 GeV
• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• Study of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Observation of a Charged Charmonium-like State at Belle
• Observation of two charged bottomonium-like resonances in Y(5S) decays
• Can the X(3872) be a 1^{++} four-quark state?
• Charm couplings and form factors in QCD sum rules
• Predictions of charged charmonium-like structures with hidden-charm and open-strange channels
• Doubly Heavy Tetraquarks in QCD Sum Rules
• $D_s{D}^{\ast }$ molecule as an axial meson
• Interpretation of $Z_c(4025)$ as the Hidden Charm Tetraquark States via QCD Sum Rules
• Estimating the mass of the hidden charm $1^{+}(1^{+})$ tetraquark state via QCD sum rules
• The decay width of the $Z_c(3900)$ as an axialvector tetraquark state in solid quark-hadron duality
• Analysis of the hidden-charm tetraquark mass spectrum with the QCD sum rules
• Predicition for the decay width of a charged state near the $D_s{\bar{D}}^{\ast }/D_s^{\ast }\bar{D}$ threshold
• Tetraquark States with Open Flavors
• Exotic Doubly Charmed Ds0*(2317)D and Ds1*(2460)D* Molecules
• Exclusive and Semi-Inclusive B Decays Based on \hspace{0.3cm} b $\to$ s \hspace{0.01cm}${\eta }_c$ \hspace{0.3cm} Transition
• Strange hadrocharmonium
• Hidden-bottom and -charm hexaquark states in QCD sum rules
• Analysis of the hidden-bottom tetraquark mass spectrum with the QCD sum rules
• The impact of $S$-wave thresholds $D_{s1}{\bar{D}}_s+c.c.$ and $D_{s0}{\bar{D}}_s^{\ast }+c.c.$ on vector charmonium spectrum
• Molecular states with hidden charm and strange in QCD Sum Rules
• Analysis of the possible $D{\bar{D}}_{s0}^{\ast }(2317)$ and $D^{\ast }{\bar{D}}_{s1}^{\ast }(2460)$ molecules with QCD sum rules

Cited by in corpus (38)

• An updated review of the new hadron states
• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Hadronic molecules in B decays
• Possible structure of the newly found exotic state ${\eta }_1(1855)$
• Exotic ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ molecular states and $sc\bar{q}\bar{c}$ tetraquark states with $J^P=0^{+},1^{+},2^{+}$
• Predicting the ${\bar{D}}_s^{(\ast )}{D}_s^{(\ast )}$ bound states as the partners of $X(3872)$
• Implications of the $Z_{cs}(3985)$ and $Z_{cs}(4000)$ as two different states
• A combined analysis of the $Z_c(3900)$ and the $Z_{cs}(3985)$ exotic states
• A unified description of the hidden-charm tetraquark states $Z_{cs}(3985)$, $Z_c(3900)$ and $X(4020)$
• Hidden-charm tetraquarks with strangeness in the chiral quark model
• Is $Z_{cs}(3982)$ a molecular partner of $Z_c(3900)$ and $Z_c(4020)$ states?
• Light baryonium spectrum
• Observation of a vector charmoniumlike state at 4.7 $\mathrm{GeV}/c^2$ and search for $Z_{cs}$ in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• Evidence for a neutral near-threshold structure in the $K_{\mathrm{S}}^0$ recoil-mass spectra in $e^{+}{e}^{-}\to K_{\mathrm{S}}^0{D}_s^{+}{D}^{\ast -}$ and $e^{+}{e}^{-}\to K_{\mathrm{S}}^0{D}_s^{\ast +}{D}^{-}$
• ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ molecular state with $J^P=1^{+}$
• Study of isospin eigenstates of the pentaquark molecular states with strangeness
• Strange hidden-charm tetraquarks in constituent quark models
• Threshold effects as the origin of $Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ observed in $B^{+}\to J/\psi \varphi K^{+}$
• $Z_{cs}$ states from the $D_s^{\ast }{\bar{D}}^{\ast }$ and $J/\psi K^{\ast }$ coupled channels: Signal in $B^{+}\to J/\psi \varphi K^{+}$ decay
• Production of $Z_{cs}$ in $B$ and $B_s$ decay
• Gluonic nature of the newly observed state $X(2600)$
• The decay widths of the $Z_{cs}(3985/4000)$ based on rigorous quark-hadron duality
• The strange cousin of the $Z_c(4020/4025)$ as tetraquark state
• $Z_{cs}(3985)$ in next-to-leading-order chiral effective field theory -- the first truncation uncertainty analysis
• Rare ${\Lambda }_c$ decays and new physics effects
• Gluonic Hidden-charm Tetraquark States
• Tetraquark molecular states in the $D_s{\bar{D}}_{s1}$ and $D_s^{\ast }{\bar{D}}_{s0}^{\ast }$ mass spectrum
• Strong decays of the vector tetraquark states with the masses about $4.5\mathrm{GeV}$ via the QCD sum rules
• Spectrum of Light Hexaquark States in Triquark-antitriquark Configuration
• Investigating $Z_{cs}(3985)$ and $Z_{cs}(4000)$ exotic states in ${\Lambda }_b\to Z_{cs}^{-}p$ decays
• The $Z_{cs}$ states and the mixture of hadronic molecule and diquark-anti-diquark components within effective field theory
• Fully strange tetraquark states via QCD sum rules
• Baryons and baryoniums in the perspective of QCD sum rules
• Two-body strong decays of the hidden-charm tetraquark molecular states via the QCD sum rules
• Hunting for the heavy quark spin symmetry partner of $Z_{cs}$
• Spectrum of Hidden-Charm, Open-Strange Exotics in the Dynamical Diquark Model
• Strange pentaquark molecules in QCD sum rules
• Search for $e^{+}{e}^{-}\to K_S^0{K}_S^0{h}_c$