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• W2057339915 abstract "Angular correlations between unidentified charged trigger ($t$) and associated ($a$) particles are measured by the ALICE experiment in Pb-Pb collisions at $sqrt{s_{rm NN}}=2.76$ TeV for transverse momenta $0.25 < p_{T}^{t,, a} < 15$ GeV/$c$, where $p_{T}^t > p_{T}^a$. The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval $|eta| < 1.0$. Distributions in relative azimuth $Deltaphi equiv phi^t - phi^a$ are analyzed for $|Deltaeta| equiv |eta^t - eta^a| > 0.8$, and are referred to as long-range correlations. Fourier components $V_{nDelta} equiv langle cos(nDeltaphi)rangle$ are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy $V_{nDelta}(p_{T}^t, p_{T}^a)$ is fully described in terms of single-particle anisotropies $v_n (p_{T})$ as $V_{nDelta}(p_{T}^t, p_{T}^a) = v_n(p_{T}^t) , v_n(p_{T}^a)$. This expectation is tested for $1 leq n leq 5$ by applying a global fit of all $V_{nDelta} (p_{T}^t, p_{T}^a)$ to obtain the best values $v_{n}{GF} (p_{T})$. It is found that for $2 leq n leq 5$, the fit agrees well with data up to $p_T^a sim 3$-4 GeV/$c$, with a trend of increasing deviation as $p_{T}^t$ and $p_{T}^a$ are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full $0.25 < p_{T} < 15$ GeV/$c$ range using a single $v_n(p_T)$ curve; such a description is however approximately possible for $2 leq n leq 5$ when $p_T^a < 4$ GeV/$c$. For the $n=1$ harmonic, however, a single $v_1(p_T$ curve is not obtained even within the reduced range $p_T^a < 4$ GeV/$c$." @default.
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