Motivated by the very recent discovery of the strange hidden-charm exotic state Zcs(3985) by the BESIII Collaboration, we study possible interpretation of this exotic state both at T = 0 and T = 0. We analytically compute the mass and meson-current coupling constant of this resonance with spinparity J P C = 1 +− at finite temperature approximation up to sixth order of the thermal operator dimension including non-perturbative contributions. Extracting thermal mass and meson-current coupling constant sum rules, the modifications on properties of Zcs(3985) state in hot medium is determined. As a by product, the hadronic parameters of the bottom partner of Zcs( 3985) is estimated as well. Moreover the search of temperature effects on the hadronic parameters of hidden-charm meson Zcs(3985) and the bottom partner make us understand the phase transitions, chiral symmetry breaking and the properties of hot-dense matter in QCD.

We have computed the masses and decay constants of isotriplet π 2 (1670), the isoscalar η 2 (1645) and η 2 (1870) states as the ground-state nonet of 1 1 D 2 case within the Thermal QCD sum rules framework. This method is applied to the spectral changes of pseudotensor mesons at high temperatures including quark, gluon, and mixed condensates up to the five dimensions. We found that their masses and decay constants are insensitive to temperature in low-temperature region. At the near critical temperature, we observed an exponential decrease of the masses of π 2 , η 2 (1645), and η 2 (1870), but while the decay constant of π 2 is fallen, that of η 2 (1645) and η 2 (1870) is increased as a function of temperature. The modification of condensates at T = 0 is crucial to the change of considered mesons properties in hot medium. We discuss and interpret the implications of the physical meaning of our results.

Since the low mass of D * s0 (2317) has still been a problem to the conventional quark model, one can consider other options regarding as multi-quark system. Therefore we investigate the scalar open-charm state D * s0 (2317) by Thermal QCD Sum Rules (TQCDSR) method using the two-point correlation function together with contributions of the non-perturbative condensates up to dimension six. Deriving and numerically analyzing thermal mass and pole residue sum rules, we accomplish the effects on the properties of D * s0 (2317) resonance in hot medium. Our numerical evaluations indicate that the variations in mass and pole residue values are stable through the growing temperature up to T ∼ = 100 MeV, but they begin to fall sharply after this point. At critical temperature, the values of mass and pole residue change up to 7%, 29% of their values in vacuum in the molecular scenario and 7%, 32% in the diquark-antidiquark scenario. Our results does not give any definite information as to whether D * s0 (2317) resonance has molecular or diquark-antidiquark structure since they are very close to each other to differentiate them. Besides, we predict the hadronic parameters of the bottom partner of the D * s0 (2317) resonance in both molecular and diquark-antidiquark pictures. This bound state is worth investigating in future experiments. Also the detailed search of hot medium effects on the hadronic parameters of open-charm meson D * s0 (2317) and the bottom partner could have some implications to define the QCD phase diagram obtained from heavy-ion collision experiments. Moreover these results can be useful in distinguishing conventional quark model mesons from exotica.