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.
Author
Collaboration ALICE
(CERN, Geneva, Switzerland)
Co-author
Claude Andre Pruneau
(Department of Physics and Astronomy)
