p(T)-dependent multiplicity fluctuations from PCA and initial conditions

Author(s)

Gardim, Fernando G. ; Grassi, Frederique ; Ishida, Pedro ; Luzum, Matthew ; Ollitrault, Jean-Yves

• Document type: Journal article
• Source: Nuclear Physics A; v. 1005, p. 4-pg., 2021-01-01.

Abstract

We present a Principal Component Analysis for a hydrodynamic simulation and compare with CMS experimental data. While the results are reasonable for anisotropic flow, for multiplicity fluctuations they are qualitatively different. We argue that this is due to too large transverse momentum (p(T)) fluctuations and N - p(T) covariance in the simulation than seen experimentally. In turn this is related to too large initial size fluctuations. (AU)

• FAPESP's process: 18/18075-0 - PCA method in high energy nuclear collisions
• Grantee: Frédérique Marie Brigitte Sylvie Grassi
• Support Opportunities: Scholarships abroad - Research
• 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: 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