# Quark Matter 2018

May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Probing the transverse size of initial inhomogeneities with flow observables

May 16, 2018, 12:10 PM
20m
Sala Mosaici-1, 3rd Floor (Palazzo del Casinò)

### Sala Mosaici-1, 3rd Floor

#### Palazzo del Casinò

Parallel Talk Collective dynamics

### Speaker

Frederique Grassi

### Description

Disentangling the effect of initial conditions and medium properties is an open question in the field of relativistic heavy-ion collisions. We argue that, while one can study the impact of initial inhomogeneities by varying their size, it is important to maintain the global properties fixed.

We present a method to do this by systematically smoothening the initial conditions, and apply it to four common initial condition models. We show that many observables are insensitive to the the hot spot sizes, including integrated $v_n$, scaled distributions of $v_n$, symmetric cumulants, event-plane correlations, and differential $v_n(p_T)$. We find however that the factorization breaking ratio $r_n$ and sub-leading component in a Principal Component Analysis are more sensitive to the initial granularity and can be used to probe short-scale features of the initial density.

Reference: article submitted to arXiv

Centralised submission by Collaboration Presenter name already specified Theory

### Co-authors

Mr Pedro Ishida (Universidade de São Paulo-Brazil) Mr Pablo Magalhães (Universidade de Alfenas-Brazil) Prof. Jacquelyn Noronha-Hostler (Rutgers University)