Speaker
Dominik Karol Derendarz
(Polish Academy of Sciences (PL))
Description
We report on measurements of the anisotropy of charged particles in lead-lead collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV, using multi-particle cumulants calculated with the generating function method. The results on the transverse momentum, pseudorapidity and centrality dependence of the elliptic flow (v2) obtained from two-, four-, six- and eight-particle cumulants are presented. Higher-order coefficients, v3 and v4 are also derived using two- and four-particle cumulants and shown as a function of centrality and transverse momentum. A reduction of contributions not related to the initial geometry for vn studied with cumulant expansion of correlations between more than two particles is discussed. Event-by-event fluctuations of the flow harmonics evaluated with multi-particle cumulants as a function of transverse momentum and the collision centrality are also presented. These results are complemented with the pT-integrated elliptic flow measured in the pseudorapidity range |$\eta$|< 2.5 with the event plane method, exploring the range of very low transverse momenta. This was achieved by applying dedicated track reconstruction methods. The centrality dependence of the integrated v2, spanning the range of 0–80% of most central Pb+Pb collisions, is compared to other measurements obtained with higher $p_T$ thresholds. The pseudorapidity dependence of the integrated elliptic flow in different centrality intervals is discussed and compared to the lower energy RHIC data.
| On behalf of collaboration: | ATLAS |
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Primary author
Dominik Karol Derendarz
(Polish Academy of Sciences (PL))
