### Speaker

### Description

The flow coefficients $v_n$ are commonly extracted from multi-particle distributions where the properties of one or several particles are averaged over a large range in pseudorapidity $\eta$ or transverse momentum $p_{\text{T}}$.

Such approaches assume that the observed multi-particle distributions can be factorized into a product of single-particle distributions.

However, it is known that this condition is violated even in ideal hydrodynamics due to initial state fluctuations or the presence of non-flow.

Detailed studies of a possible violation of this factorization assumption can therefore be used to constrain the size of such fluctuations as well as to identify possible non-flow contributions.

A factorization breakdown can be measured directly in multi-particle probability distributions.

This poster presents an explicit approach to the $\eta$-dependent factorization of two-particle probability distributions within $-3.4 \leq \eta \leq 5$ in the latest $\sqrt{s_{NN}} = 5.02$ TeV Pb--Pb data measured with ALICE.

A factorizing phase-space region is identified by varying the minimal $\Delta\eta$ separation between particles; the factorization breakdown for small separations is attributed to non-flow and detector effects.

The analysis yields the well known $v_n$ coefficients as the result of the factorization process.

These flow coefficients are compared to similar results measured with the Q-cumulant method.

All findings are also compared to model calculations and previous studies at $\sqrt{s_{NN}} = 2.76$ TeV.

Collaboration | ALICE |
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Content type | Experiment |

Centralised submission by Collaboration | Presenter name already specified |