【摘 要】
：
Recently,the hidden charm tetraquark states Zcs(3985) and Zcs(4000) with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics (QCD) structures.The first and fo
【机 构】
：
Institut für Theoretische Physik Ⅱ,Ruhr-Universit(a)t Bochum,D-44780 Bochum,Germany;School of Physic
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Recently,the hidden charm tetraquark states Zcs(3985) and Zcs(4000) with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics (QCD) structures.The first and foremost question is whether they are the same state.In this work,we explore the implications of the narrower state Zcs(3985) in BESⅢ and the wider one Zcs(4000) in LHCb as two different states.Within a solvable nonrelativistic effective field the-ory,we include the possible violations of heavy quark spin symmetry and SU(3) flavor symmetry in a comprehensive approach.If Zcs(3985) and Zcs(4000) are two different states,our results show that Zcs(4000)/Zcs(3985) is the pure (|(D)*sD〉 + /-|(D)sD*〉)/√2 state,and the SU(3) flavor partner of Zc(3900)is Zcs(4000) rather than the Zcs(3985).Another two important consequences are the existence of a tensor(D)*sD* resonance with mass about 4126 MeV and width 13 MeV,and the suppression of the decay mode Zcs(3985) →J/ψK.The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.
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