Production of doubly charmed hadrons Ξcc++ and Tcc+ in relativistic …

Heavy-ion collisions provide a unique opportunity for studying the properties of exotic hadrons with two charm quarks. The production of Tcc⁺ is significantly enhanced in nuclear collisions compared to proton-proton collisions due to the creation of multiple-charm pairs. In this study, we employ the Langevin equation in combination with the instantaneous coalescence model (LICM) to investigate the production of Tcc⁺ and Ξcc⁺⁺ which consists of two charm quarks. We consider Tcc⁺ as molecular states composed of D and D* mesons. The Langevin equation is used to calculate the energy loss of charm quarks and D mesons in the hot medium. The hadronization process, where charm quarks transform into each D state as constituents of Tcc⁺ production, is described using the coalescence model. The coalescence probability between D and D* is determined by the Wigner function, which encodes the information of the Tcc⁺ wave function. Our results show that the Tcc⁺ production varies by approximately 1 order of magnitude when different widths in the Wigner function, representing distinct binding energies of Tcc⁺, are considered. This variation offers valuable insights into the nature of Tcc⁺ through the analysis of its wave function. Ξcc⁺⁺ is treated as a hadronic state produced at the hadronization of the deconfined matter. Its production is also calculated as a comparison with the molecular state Tcc⁺.