The newly observed Zcs<mml:msup>(3985)-</mml:msup> state: in vacuum and a dense medium
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We report on some properties of the newly observed charged hidden-charmed open strange Zcs(3985)- state by BESIII Collaboration. Assigning the quantum numbers JP=1+ and the quark composition cc<overbar></mml:mover>su<overbar></mml:mover> and considering it as the strange partner of the famous Zc(3900) state, we estimate the mass of the Zcs(3985)- resonance in vacuum and compare it with the experimental data. We also investigate its mass, current coupling and vector-self energy in a medium with finite density. Our result on the mass in vacuum agrees well with the experimental data. We estimate the mass and current coupling of the b-partner of this state, Zbs, in the vacuum as well. For its mass we get mZbs=10732-46+97</mml:msubsup><mml:mspace width="3.33333pt"></mml:mspace>MeV, which may be checked via other nonperturbative approaches as well as future experiments. We present the dependence of the spectroscopic parameters of <mml:msub>Zcs(3985<mml:mo stretchy="false">)<mml:mo>- state on density and observe that these parameters are linearly changed with increasing in the density.