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Jun 24 – 28, 2019
US/Eastern timezone
5th International Conference on the Initial Stages in High-Energy Nuclear Collisions

A Principal Component Analysis of event-by-event fluctuations in hydrodynamic simulations at the LHC

Not scheduled
8th floor Theory Center (Pupin)

8th floor Theory Center


Poster Initial conditions for hydrodynamics & transport coefficients Posters


Frederique Grassi (Universidade de São Paulo-Brazil)


Hydro simulations are compared with recent experimental data by CMS, on a Principle Component Analysis. The trends for the scaled leading and sub-leading components for n=2,3 agree with data. In contrast, for n=0 there is a qualitative disagreement: the leading component increases with $p_T$ while it is constant in data. Using a toy model where the principal components can be computed analytically, it is shown that the n=0 leading and sub-leading components are extremely dependent on fluctuations in $N$ and $\bar{p_T}$ as well as their covariance and provide a new and clean way to study fluctuations and rule out initial condition models.

Primary authors

Prof. Fernando Gardim (Universidade Federal de Alfenas-Brazil) Frederique Grassi (Universidade de São Paulo-Brazil) Jean-Yves Ollitrault (Université Paris-Saclay) Dr Matthew Luzum (Universidade de Sao Paulo) Mr Pedro Ishida (Universidade de São Paulo)

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