Prehydrodynamic evolution in large and small systems

Author(s)

da Silva, T. Nunes ; Chinellato, D. D. ; V. Giannini, A. ; Takahashi, J. ; Ferreira, M. N. ; Denicol, G. S. ; Hippert, M. ; Noronha, J. ; Luzum, M.

• Document type: Journal article
• Source: PHYSICAL REVIEW C; v. 107, n. 4, p. 12-pg., 2023-04-12.

Abstract

We extend our previous investigation of the effects of prehydrodynamic evolution on final-state observables in heavy-ion collisions [38] to smaller systems. We use a state-of-the-art hybrid model for the numerical simulations with optimal parameters obtained from a previous Bayesian study. By studying p-Pb collisions, we find that the effects due to the assumption of a conformal evolution in the prehydrodynamical stage are even more important in small systems. We also show that this effect depends on the time duration of the pre-equilibrium stage, which is further enhanced in small systems. Finally, we show that the recent proposal of a free-streaming with subluminal velocity for the pre-equilibrium stage, thus effectively breaking conformal invariance, can alleviate the contamination of final-state observables. Our study further reinforces the need for moving beyond conformal approaches in pre-equilibrium dynamics modeling, especially when extracting transport coefficients from hybrid models in the high-precision era of heavy-ion collisions. (AU)

• FAPESP's process: 16/13803-2 - Strangeness production in Pb-Pb collisions at 5.02TeV in ALICE
• Grantee: David Dobrigkeit Chinellato
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/07833-1 - Hydrodynamical behavior of the QGP near the critical point
• Grantee: Maurício Hippert Teixeira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/24029-6 - Investigating the strong nuclear interactions under extreme conditions
• Grantee: Matthew William Luzum
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 21/04924-9 - Phenomenology of high energy collisions initial stages
• Grantee: André Veiga Giannini
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/24720-6 - Exploring the QCD phase diagram
• Grantee: Frédérique Marie Brigitte Sylvie Grassi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/05685-2 - Hadronic physics in high energy nuclear collisions
• Grantee: Jun Takahashi
• Support Opportunities: Special Projects