Hard gluon evolution in warming medium

• Autor(a) principal: Ben, Felipe Gregoletto
• Data de Publicação: 2022
• Outros Autores: Machado, Magno Valério Trindade
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/235281
• topic: Aceleradores de partículas; Gluons; Colisao de ions pesados

We describe the energy distribution of hard gluons travelling through a dense quark–gluon plasma whose temperature increases linearly with time, within a probabilis tic perturbative approach. The results were applied to the thermalization problem in heavy ion collisions. In the weak coupling picture this thermalization occurs from “the bot tom up”: high energy partons, formed early in the collision, radiate low energy gluons which then proceed to equilibrate among themselves, forming a thermal bath that brings the high energy sector to equilibrium. We see that, in this sce nario, the dynamic we describe must set in around t ∼ 0.5 fm/c after the collision in order to reach a fully thermalized state at t ∼ 1 fm/c. We then look at the entropy density and average temperature of the soft thermal bath, as the system approaches (local) thermal equilibrium.