# DPF 2011

8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone

## Hydrodynamic flow in Pb+Pb collisions observed via azimuthal angle correlations of charged hadrons

9 Aug 2011, 16:00
25m
552 B (Rhode Island Convention Center)

### 552 B

#### Rhode Island Convention Center

Parallel contribution Heavy Ion Physics/Hot and Dense QCD

### Speaker

Charles Felix Maguire (Department of Physics and Astronomy-Vanderbilt University)

### Description

Azimuthal angle correlations of charged hadrons were measured in $\sqrt s_{NN}$ = 2.76 TeV Pb+Pb collisions by the CMS experiment. The distributions exhibit anisotropies that are correlated with the event-by-event orientation of the reaction plane. Several methods were employed to extract the strength of the signal: the event-plane, cumulant and Lee-Yang Zeros methods. These methods have different sensitivity to correlations that are not caused by the collective motion in the system (non-flow correlations due to jets, resonance decays, and quantum correlations). The second Fourier coefficient of the charged hadron azimuthal distributions was measured as a function of transverse momentum, pseudorapidity and centrality in a broad kinematic range: $0.3 < p_T < 12.0$ GeV/c, $|\eta| < 2.4)$, as a function of collision centrality. In addition, first results on odd Fourier components will be presented and their connection to the hydrodynamic medium will be discussed.

### Primary author

Charles Felix Maguire (Department of Physics and Astronomy-Vanderbilt University)

 Slides