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arXiv · 2011.11488

The newly observed $ Z_{cs}(3985)^- $ state: in vacuum and a dense medium

K. Azizi·N. Er
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Abstract

We report on some properties of the newly observed charged hidden-charmed open strange $ Z_{cs}(3985)^- $ state by BESIII Collaboration. Assigning the quantum numbers $ J^{P} = 1^{+}$ and the quark composition $ c \bar c s\bar u $ and considering it as the strange partner of the famous $ Z_c(3900) $ state, we estimate the mass of the $ Z_{cs}(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, $ Z_{bs}$, in the vacuum as well. For its mass we get $ m_{Z_{bs}}= 10732^{+97}_{-46}~\mbox{MeV}$, which may be checked via other nonperturbative approaches as well as future experiments. We present the dependence of the spectroscopic parameters of $ Z_{cs}(3985)^- $ state on density and observe that these parameters are linearly changed with increasing in the density.

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K. Azizi, N. Er. 2020-11-23. The newly observed $ Z_{cs}(3985)^- $ state: in vacuum and a dense medium. https://doi.org/10.1140/epjc%2Fs10052-021-08859-6

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