Triggered di-hadron correlations in Pb--Pb collisions from the ALICE experiment

Understand

Angular correlations between unidentified hadron trigger and associated particles are measured by the ALICE experiment for $0.5 < p_T^{t,a} < 15$ GeV, where $\ptt \geq \pta$.

• The pair correlation shapes are examined in a variety of centrality categories for pairs in $|\eta| < 1.0$ where $|\eta^t - \eta^a| > 0.8$.
• A series of two-particle Fourier components $V_{n\Delta} \equiv <\cos(n\Delta\phi)>$ are extracted from the long-range azimuthal correlation functions.
• The sum of $n<6$ terms match the data.