Update on J/psi regeneration in a hadron gas

• Autor(a) principal: Abreu, L. M.
• Data de Publicação: 2018
• Outros Autores: Khemchandani, Kanchan Pradeepkumar [UNIFESP], Torres, A. Martinez, Navarra, F. S., Nielsen, M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: https://repositorio.unifesp.br/handle/11600/55643; http://dx.doi.org/10.1103/PhysRevC.97.044902

In heavy-ion collisions, after the quark-gluon plasma there is a hadronic gas phase. Using effective Lagrangians, we study the interactions of charmed mesons which lead to J/psi production and absorption in this gas. We update and extend previous calculations introducing strange meson interactions and also including the interactions mediated by the recently measured exotic charmonium resonances Z(3900) and Z(4025). These resonances open new reaction channels for the J/psi, which could potentially lead to changes in its multiplicity. We compute the J/psi production cross section in processes such as D-(s)(*) + (D) over bar(*) -> J/psi + (pi, rho, K, K*) and also the J/psi absorption cross section in the corresponding inverse processes. Using the obtained cross sections as input to solve the appropriate rate equation, we conclude that the interactions in the hadron gas phase lead to a 20-24% reduction of the J/psi abundance. Within the uncertainties of the calculation, this reduction is the same at the Relativistic Heavy Ion Collider and the large Hadron Collider.