Initial Stages 2019

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

Not scheduled

1m

8th floor Theory Center (Pupin)

Poster Initial conditions for hydrodynamics & transport coefficients Posters

Speaker

Frederique Grassi (Universidade de São Paulo-Brazil)

Description

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 $\overline{p_T}$ as well as their covariance and provide a new and clean way to study fluctuations and rule out initial condition models.