https://doi.org/10.1140/epjc/s10052-021-08859-6
Regular Article – Theoretical Physics
The newly observed 
state: in vacuum and a dense medium
1
Department of Physics, University of Tehran, North Karegar Ave., 14395-547, Tehran, Iran
2
Department of Physics, Doǧuş University, Acibadem-Kadiköy, 34722, Istanbul, Turkey
3
Department of Physics, Bolu Abant İzzet Baysal University, Gölköy Kampüsü, 14030, Bolu, Turkey
Received:
23
November
2020
Accepted:
8
January
2021
Published online:
20
January
2021
We report on some properties of the newly observed charged hidden-charmed open strange state by BESIII Collaboration. Assigning the quantum numbers 
and the quark composition 
and considering it as the strange partner of the famous 
state, we estimate the mass of the 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, 
, in the vacuum as well. For its mass we get 
, which may be checked via other nonperturbative approaches as well as future experiments. We present the dependence of the spectroscopic parameters of state on density and observe that these parameters are linearly changed with increasing in the density.
© The Author(s) 2021
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