# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Transverse momentum correlations in Pb-Pb collisions at sqrt(NN) = 2.76~TeV

16 Aug 2012, 16:00
2h

Poster Correlations and fluctuations

### Speaker

Claude Andre Pruneau (Department of Physics and Astronomy)

### Description

We report on the first study of transverse momentum differential correlation, $\la \Delta p_t \Delta p_t \ra$, in Pb - Pb collisions at \snn~= 2.76~TeV measured with the ALICE detector at the CERN Large Hadron Collider. We measure the two-particle correlation functions for $++$, $--$, and $+-$ charged particle pairs as a function of the pair azimuthal, $\Delta\phi$, and pseudorapidity, $\Delta\eta$, differences, and study their evolution with collision centrality. We find that similarly to number two-particle correlations, the $\la \Delta p_t \Delta p_t \ra$ correlations shape and amplitude exhibit a strong dependence on collision centrality. We further observe they too exhibit near-side ridge-like and double away-side peak structures in most central collisions. We carry out Fourier decompositions of the correlation dependence on $\Delta\phi$ as a function of $\Delta\eta$ and find the harmonics coefficients are essentially constant for $\Delta\eta>0.6$. We compare the measured harmonic coefficients with flow coefficients $v_2$, $v_3$, $v_4$ obtained with the reaction plane method and find that, up to scaling factors that depend on the order of the coefficients, they have identical collision centrality dependence.

### Primary author

Collaboration ALICE (CERN, Geneva, Switzerland)

### Co-author

Claude Andre Pruneau (Department of Physics and Astronomy)

 Poster