# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Measurement of dipole flow associated with initial geometry fluctuations in Pb-Pb collisions with the ATLAS detector

15 Aug 2012, 11:20
20m
Regency 2/3 ()

### Regency 2/3

Oral Presentation

### Speaker

Jiangyong Jia (Brookhaven National Laboratory (BNL)-Unknown-Unknown)

### Description

A study of the dipole flow (v_1) associated with initial geometry fluctuations is presented using the 2010 Pb-Pb data. This analysis involves a systematic decomposition of the first order Fourier coefficient of the two-particle correlation into a dipole flow component and a global momentum conservation component. The dipolar flow is extracted as function of pT (0.5-10 GeV), centrality (0-50%) and pseudorapidity (|eta|<2.5). The magnitude of the extracted global momentum conservation component is used to estimate the effective size of the system that conserve momentum as a function of centrality. These results are compared with recent model calculations and their implications on the initial dipole asymmetry are discussed.

### Primary author

Zdenek ATLAS Collaboration (Charles University Prague)

### Co-author

Jiangyong Jia (Brookhaven National Laboratory (BNL)-Unknown-Unknown)

 Slides