Interactions of exotic states in a medium
hadronic: the case of Zc(3900)
Exotic hadrons, tetraquark, Zc(3900) state
In 2013, the BESIII and Belle collaborations observed the charged exotic state Zc(3900) in the invariant mass spectrum of J/ψπ±. In an attempt to theoretically understand its nature, we studied the interactions of this state in a hadronic medium composed of light mesons, specifically the production and absorption of this state through processes such as Zcπ → DD¯, Zcπ → D ∗D¯ ∗ , Zcπ → DD¯ ∗ , and their respective inverse processes. Therefore, considering the Zc(3900) as a compact tetraquark state of the type diquark-antidiquark (ccq¯ q¯) and using effective Lagrangians, we determined the vacuum cross-sections for each process, the total cross-sections, the sum of all cross-sections, and their respective thermal-averages. The results suggest that the interactions of the cited state with the constituent particles of the hadronic medium are relevant.