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Measurement of the correlation between flow harmonics of different order in lead-lead collisions at $\sqrt{s_{NN}}$=2.76 TeV with the ATLAS detector

G. Aad 1 S. Albrand 2 J. Brown 2 J. Collot 2 S. Crépé-Renaudin 2 P.A. Delsart 2 C. Gabaldon 2 M.H. Genest 2 J.Y. Hostachy 2 F. Ledroit-Guillon 2 A. Lleres 2 A. Lucotte 2 F. Malek 2 C. Monini 2 J. Stark 2 B. Trocmé 2 M. Wu 2 G. Rahal 3 L. Alio 1 M. Barbero 1 Y. Coadou 1 C. Diaconu 1 Sara Diglio 1 F. Djama 1 L. Feligioni J. Gao 1 G.D. Hallewell 1 F. Hubaut 1 S.J. Kahn 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 J. Liu 4 K. Liu 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 Y. Nagai 1 E. Nagy 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 R.E. Ticse Torres 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 L. Vacavant 1 O. Duccu 5, 1 M.K. Ayoub 6 A. Bassalat 6 C. Becot 6 S. Binet 6 C. Bourdarios 6 J.B. de Vivie De Regie 6 D. Delgove 6 L. Duflot 6 M. Escalier 6 L. Fayard 6 D. Fournier 6 E.L. Gkougkousis 6 J.-F. Grivaz 6 T. Guillemin 6 F. Hariri 6 S. Henrot-Versillé 6 J. Hrivnac 6 L. Iconomidou-Fayard 6 M. Kado 6 A. Lounis 6 N. Makovec 6 N. Morange 6 C. Nellist 6 L. Poggioli 6 P. Puzo 6 A. Renaud 6 D. Rousseau 6 G. Rybkin 6 A.C. Schaffer 6 E. Scifo 6 L. Serin 6 S. Simion 6 R. Tanaka 6 H.L. Tran 6 D. Zerwas 6 Z. Zhang 6 Y. Zhao D. Boumediene 7 Emmanuel Busato 7 D. Calvet 7 S. Calvet 7 J. Donini 7 E. Dubreuil 7 G. Gilles 7 Ph. Gris 7 H. Liao 7 R. Madar 7 D. Pallin 7 S.M. Romano Saez 7 C. Santoni 7 D. Simon 7 Timothée Theveneaux-Pelzer 7 F. Vazeille 7 Z. Barnovska 8 N. Berger 8 M. Delmastro 8 L. Di Ciaccio 8 S. Elles 8 T. Hryn’ova 8 S. Jézéquel 8 I. Koletsou 8 R. Lafaye 8 J. Leveque 8 N. Massol 8 G. Sauvage 8 E. Sauvan 8 M. Schwoerer 8 O. Simard 8 T. Todorov 8 I. Wingerter-Seez 8 E. Yatsenko 8
Abstract : Correlations between the elliptic or triangular flow coefficients $v_m$ ($m$=2 or 3) and other flow harmonics $v_n$ ($n$=2 to 5) are measured using $\sqrt{s_{NN}}=2.76$ TeV Pb+Pb collision data collected in 2010 by the ATLAS experiment at the LHC, corresponding to an integrated lumonisity of 7 $\mu$b$^{-1}$. The $v_m$-$v_n$ correlations are measured in midrapidity as a function of centrality, and, for events within the same centrality interval, as a function of event ellipticity or triangularity defined in a forward rapidity region. For events within the same centrality interval, $v_3$ is found to be anticorrelated with $v_2$ and this anticorrelation is consistent with similar anticorrelations between the corresponding eccentricities $\epsilon_2$ and $\epsilon_3$. On the other hand, it is observed that $v_4$ increases strongly with $v_2$, and $v_5$ increases strongly with both $v_2$ and $v_3$. The trend and strength of the $v_m$-$v_n$ correlations for $n$=4 and 5 are found to disagree with $\epsilon_m$-$\epsilon_n$ correlations predicted by initial-geometry models. Instead, these correlations are found to be consistent with the combined effects of a linear contribution to $v_n$ and a nonlinear term that is a function of $v_2^2$ or of $v_2v_3$, as predicted by hydrodynamic models. A simple two-component fit is used to separate these two contributions. The extracted linear and nonlinear contributions to $v_4$ and $v_5$ are found to be consistent with previously measured event-plane correlations.
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Submitted on : Tuesday, April 7, 2015 - 9:12:45 AM
Last modification on : Tuesday, October 19, 2021 - 10:50:46 PM

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G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Measurement of the correlation between flow harmonics of different order in lead-lead collisions at $\sqrt{s_{NN}}$=2.76 TeV with the ATLAS detector. Physical Review C, American Physical Society, 2015, 92, pp.034903. ⟨10.1103/PhysRevC.92.034903⟩. ⟨in2p3-01139769⟩