Abstract
In the framework of the chiral quark model (ChQM), we systematically investigate the strange hidden-charm tetraquark systems cs{bar{c}}{bar{u}} with two structures: q{bar{q}}-q{bar{q}} and qq-{bar{q}}{bar{q}}. The bound-state calculation shows that there is no any bound state in present work, which excludes the molecular state explanation (D^{0}D_{s}^{*-}/D^{*0}D_{s}^{-}/D^{*0}D_{s}^{*-}) of the reported Z_{cs}(3985)^{-} or Z_{cs}(4000)^{+}. However, the effective potentials for the cs-{bar{c}}{bar{u}} systems show the possibility of some resonance states. By applying a stabilization calculation and coupling all channels of both two structures, two new resonance states are obtained, which are the IJ^{P}=frac{1}{2} 0^{+} state with the energy around 4111–4116 MeV and the IJ^{P} =frac{1}{2} 1^{+} state with energy around 4113–4119 MeV, respectively. Both of them are worthy of search in future experiments. Our results show that the coupling calculation between the bound channels and open channels is indispensable to provide the necessary information for experiments to search for exotic hadron states.
Highlights
Zc±(4025) [5], Zc(3885)− [6], Zc(4200)+ [7] and Zc(4025)0 [8].In the last year, the BESIII Collaboration reported their study of the processes of e+e− → K +(Ds− D∗0 + Ds∗− D0), and found a new structure Zcs (3985)− near the Ds− D∗0/Ds∗− D0 thresholds
Our group has calculated the mass of these mesons by using the Gaussian expansion method (GEM), and found that the average size of these mesons is about 0.3 fm
We systematically investigate the low-lying charged hidden-charm tetraquark systems with strangeness in the chiral quark model (ChQM) with three different sets of parameters
Summary
Zc±(4025) [5], Zc(3885)− [6], Zc(4200)+ [7] and Zc(4025)0 [8]. In the last year, the BESIII Collaboration reported their study of the processes of e+e− → K +(Ds− D∗0 + Ds∗− D0), and found a new structure Zcs (3985)− near the Ds− D∗0/Ds∗− D0 thresholds. It is easy to get that the minimum quark component of Zcs(3985)− is cscu, and this state should be a partner structure of the well-known Zc(3885)− reported in e+e− → D∗− D0π + [6]. [26], they predicted a new state Zcs(4110)− which is the SU (3) f partner of Zc(4020)+ by Chiral constituent quark model. D.Ebert used relativistic quark model based on the quasipotential approach to calculate the mass spectra of tetraquarks [Qs][Qq ̄]/[Qq][Qs ̄](Q = c, b) [34] They found that all S-wave tetraquarks with hidden bottom lie considerably below open bottom thresholds and they should be narrow states which can be observed experimentally.
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