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Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector

G. Aad S. Albrand 1 M.L. Andrieux 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 P. de Saintignon 1 P.A. Delsart 1 J. Donini 1 D. Dzahini 1 J.Y. Hostachy 1 E. Laisne 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 P. Martin 1 F. Polci 1 J. Stark 1 X. Sun 1 B. Trocmé 1 C. Weydert 1 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 H. Bachacou 3 F. Bauer 3 N. Besson 3 N.M. Bolnet 3 M. Boonekamp 3 L. Chevalier 3 J. Ernwein 3 A.I. Etienvre 3 A. Formica 3 L. Gauthier 3 F. Giraud 3 C. Guyot 3 S. Hassani 3 W. Kozanecki 3 E. Lancon 3 J.F. Laporte 3 E. Le Menedeu 3 M. Legendre 3 B. Mansoulie 3 J.-P. Meyer 3 N. Morange 3 E. Mountricha 3 Thi Hong 3 R. Nicolaidou 3 A. Ouraou 3 D.M. Pomarede 3 B. Resende 3 C.R. Royon 3 Ph. Schune 3 J. Schwindling 3 O. Simard 3 M. Virchaux 3 C. Xu 3 J. Yu 3 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 Reina Coromoto Camacho Toro 4 Diane Cinca 5 R. Febbraro 4 N. Ghodbane 4 C. Guicheney 4 D. Pallin 4 F. Podlyski 4 C. Santoni 4 L. P. Says 4 F. Vazeille 4 S. Aoun 6 C. P. Bee 6 C. Benchouk 6 K. Bernardet 6 N. Bousson 6 J. C. Clémens 6 Y. Coadou 6 P. Delpierre 6 F. Djama 6 F. Etienne 6 L. Feligioni 6 F. Henry-Couannier 6 D. Hoffmann 6 F. Hubaut 6 E.B. F. G. Knoops 6 E. Le Guirriec 6 B. Li 6 E. Monnier 6 J. Odier 6 E. Petit 6 P. Pralavorio 6 Z. Qian 6 A. Rozanov 6 M. Talby 6 N. Tannoury 6 S. Tisserant 6 J. Toth 6 F. Touchard 6 L. Vacavant 6 T. Beau 7 S. Bordoni 7 G. Calderini 7 A. Camard 7 P. Cavalleri 7 E. Chareyre 7 S. de Cecco 7 F. Derue 7 D. Imbault 7 M.W. Krasny 7 D. Lacour 7 B. Laforge 7 O. Le Dortz 7 J. Lellouch 7 G. Marchiori 7 I. Nikolic-Audit 7 J. Ocariz 7 M. Ridel 7 L. Roos 7 Ph. Schwemling 7 Timothée Theveneaux-Pelzer 7 S. Trincaz-Duvoid 7 T.N. Trinh 7 F. Vannucci 8 L. Aperio Bella 9 B. Aubert 9 N. Berger 9 J. Colas 9 L. Di Ciaccio 9 T.K.O. Doan 9 S. Elles 9 P. Ghez 9 M. Gouanère 9 C. Goy 9 T. Guillemin 9 L. Helary 9 T. Hryn'Ova 9 G. Ionescu 9 A. Jérémie 9 S. Jézéquel 9 M. Kataoka 9 J. Labbe 9 R. Lafaye 9 J. Leveque 9 N. Massol 9 P. Perrodo 9 H. Przysiezniak 9 G. Sauvage 9 E. Sauvan 9 T. Todorov 9 D. Tsionou 9 I. Wingerter-Seez 9 R. Zitoun 9 Y. Zolnierowski 9 H. Abreu 10 N. Andari 10 C. Arnault 10 E. Augé 10 P. Barrillon 10 M. Benoit 10 S. Binet 10 J.-B. Blanchard 10 C. Bourdarios 10 D. Breton 10 C. Collard 11 C. de la Taille 10 J.B. de Vivie de Regie 10 S. Diglio 10 L. Duflot 10 M. Escalier 10 A.C. Falou 10 L. Fayard 10 D. Fournier 10 J.-F. Grivaz 10 M. Heller 10 S. Henrot-Versillé 10 J. Hrivnac 10 L. Iconomidou-Fayard 10 J. Idarraga 10 M. Kado 10 A. Lounis 10 N. Makovec 10 P. Matricon 10 F. Niedercorn 10 L. Poggioli 10 P. Puzo 10 A. Renaud 10 D. Rousseau 10 X. Ruan 10, 12 G. Rybkin 10 J.B. Sauvan 10 J. Schaarschmidt 10 A.C. Schaffer 10 L. Serin 10 S. Simion 10 R. Tanaka 10 J.J. Veillet 10 I. Vukotic 10 F. Wicek 10 D. Zerwas 10 Zhen Zhang 10
Abstract : This paper describes the measurement of elliptic flow of charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV using the ATLAS detector at the Large Hadron Collider (LHC). The results are based on an integrated luminosity of approximately 7 ub^-1. Elliptic flow is measured over a wide region in pseudorapidity, |eta| < 2.5, and over a broad range in transverse momentum, 0.5 < p_T < 20 GeV. The elliptic flow parameter v_2 is obtained by correlating individual tracks with the event plane measured using energy deposited in the forward calorimeters. As a function of transverse momentum, v_2(p_T) reaches a maximum at p_T of about 3 GeV, then decreases and becomes weakly dependent on p_T above 7 - 8 GeV. Over the measured pseudorapidity region, v_2 is found to be approximately independent of |eta| for all collision centralities and particle transverse momenta, something not observed in lower energy collisions. The results are discussed in the context of previous measurements at lower collision energies, as well as recent results from the LHC.
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http://hal.in2p3.fr/in2p3-00617932
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Submitted on : Wednesday, August 31, 2011 - 8:53:40 AM
Last modification on : Saturday, September 19, 2020 - 4:50:03 AM

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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector. Physics Letters B, Elsevier, 2012, 707, pp.330-348. ⟨10.1016/j.physletb.2011.12.056⟩. ⟨in2p3-00617932⟩

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