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 - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Physics Letters B Année : 2012

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) , Daniel 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) , Sara 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)
G. Aad
E. Cogneras
S. Calvet
Diane Cinca
Y. Coadou
F. Vannucci
  • Fonction : Auteur
N. Berger
C. Goy
T. Hryn'Ova
E. Augé
C. Collard
Sara Diglio
D. Rousseau
Zhiqing Zhang
  • Fonction : Auteur
  • PersonId : 829631

Résumé

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.

Dates et versions

in2p3-00617928 , version 1 (31-08-2011)

Identifiants

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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, 2012, 710, pp.363-382. ⟨10.1016/j.physletb.2012.02.045⟩. ⟨in2p3-00617928⟩
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