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Measurement of the centrality dependence of the charged particle pseudorapidity distribution 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 Zhiqing Zhang 10
Abstract : The ATLAS experiment at the LHC has measured the centrality dependence of charged particle pseudorapidity distributions over |eta| < 2 in lead-lead collisions at a nucleon-nucleon centre-of-mass energy of sqrt(s_NN) = 2.76 TeV. In order to include particles with transverse momentum as low as 30 MeV, the data were recorded with the central solenoid magnet off. Charged particles were reconstructed with two algorithms (2-point "tracklets" and full tracks) using information from the pixel detector only. The lead-lead collision centrality was characterized by the total transverse energy in the forward calorimeter in the range 3.2 < |eta| < 4.9. Measurements are presented of the per-event charged particle density distribution, dN_ch/deta, and the average charged particle multiplicity in the pseudorapidity interval |eta|<0.5 in several intervals of collision centrality. The results are compared to previous mid-rapidity measurements at the LHC and RHIC. The variation of the mid-rapidity charged particle yield per colliding nucleon pair with the number of participants is consistent with the lower sqrt(s_NN) results. The shape of the dN_ch/deta distribution is found to be independent of centrality within the systematic uncertainties of the measurement.
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Submitted on : Wednesday, August 31, 2011 - 8:38:53 AM
Last modification on : Saturday, November 28, 2020 - 12:58:03 PM

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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector. Physics Letters B, Elsevier, 2012, 710, pp.363-382. ⟨10.1016/j.physletb.2012.02.045⟩. ⟨in2p3-00617928⟩

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