Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue New Journal of Physics Année : 2011

Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC

G. Aad , B. Aubert (1) , M. Aurousseau (1) , N. Berger (1) , J. Colas (1) , L. Di Ciaccio (1) , M. El Kacimi (1) , S. Elles (1) , P. Ghez (1) , M. Gouanère (1) , C. Goy (1) , T. Guillemin (1) , L. Helary (1) , T. Hryn'Ova (1) , P. Iengo (1) , G. Ionescu (1) , A. Jérémie (1) , S. Jézéquel (1) , J. Labbe (1) , R. Lafaye (1) , N. Massol (1) , P. Perrodo (1) , H. Przysiezniak (1) , G. Sauvage (1) , T. Todorov (1) , I. Wingerter-Seez (1) , R. Zitoun (1) , Y. Zolnierowski (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , H. Bachacou (3) , F. Bauer (3) , N. Besson (3) , M. Boonekamp (3) , L. Chevalier (3) , F. Chevallier (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. Lenzi (3) , B. Mansoulie (3) , J.-P. Meyer (3) , N. Morange (3) , R. Nicolaidou (3) , A. Ouraou (3) , D.M. Pomarede (3) , B. Resende (3) , C.R. Royon (3) , Ph. Schune (3) , J. Schwindling (3) , M. Virchaux (3) , S. Albrand (4) , M.L. Andrieux (4) , B. Clement (4) , J. Collot (4) , S. Crépé-Renaudin (4) , P. de Saintignon (4) , P.A. Delsart (4) , J. Donini (4) , Daniel Dzahini (4) , J.Y. Hostachy (4) , E. Laisne (4) , F. Ledroit-Guillon (4) , A. Lleres (4) , A. Lucotte (4) , F. Malek (4) , P. Martin (4) , F. Polci (4) , J. Stark (4) , X. Sun (4) , B. Trocmé (4) , T. Beau (5) , S. Bordoni (5) , G. Calderini (5) , A. Camard (5) , P. Cavalleri (5) , E. Chareyre (5) , S. de Cecco (5) , F. Derue (5) , D. Imbault (5) , M.W. Krasny (5) , D. Lacour (5) , B. Laforge (5) , O. Le Dortz (5) , J. Lellouch (5) , G. Marchiori (5) , I. Nikolic-Audit (5) , J. Ocariz (5) , M. Ridel (5) , L. Roos (5) , Ph. Schwemling (5) , Timothée Theveneaux-Pelzer (5) , S. Trincaz-Duvoid (5) , T.N. Trinh (5) , F. Vannucci (6) , S. Aoun (7) , C. Bee (7) , C. Benchouk (7) , K. Bernardet (7) , N. Boussons (7) , C. Cerna (7) , J. C. Clémens (7) , Y. Coadou (7) , S. Correard (7) , P. Delpierre (7) , F. Djama (7) , F. Etienne (7) , L. Feligioni (7) , F. Henry-Couannier (7) , D. Hoffmann (7) , F. Hubaut (7) , M. Kuna (7) , E. Le Guirriec (7) , Jérémy Lévêque (7) , B. Li (7) , E. Monnier (7) , J. Odier (7) , E. Petit (7) , P. Pralavorio (7) , Z. Qian (7) , A. Rozanov (7) , M. Talby (7) , N. Tanoury (7) , S. Tisserant (7) , J. Toth (7) , F. Touchard (7) , L. Vacavant (7) , H. Abreu (8) , N. Andari (8) , C. Arnault (8) , E. Augé (8) , P. Barrillon (8) , M. Benoit (8) , S. Binet (8) , J.-B. Blanchard (8) , C. Bourdarios (8) , D. Breton (8) , C. Collard (9) , C. de La Taille (8) , J.B. de Vivie de Regie (8) , Sara Diglio (8) , L. Duflot (8) , M. Escalier (8) , A.C. Falou (8) , L. Fayard (8) , D. Fournier (8) , J.-F. Grivaz (8) , M. Heller (8) , S. Henrot-Versillé (8) , J. Hrivnac (8) , L. Iconomidou-Fayard (8) , J. Idarraga (8) , M. Kado (8) , A. Lounis (8) , N. Makovec (8) , P. Matricon (8) , F. Niedercorn (8) , L. Poggioli (8) , P. Puzo (8) , A. Renaud (8) , D. Rousseau (8) , X. Ruan (8, 10) , G. Rybkin (8) , J.B. Sauvan (8) , J. Schaarschmidt (8) , A.C. Schaffer (8) , L. Serin (8) , S. Simion (8) , R. Tanaka (8) , J.J. Veillet (8) , I. Vukotic (8) , F. Wicek (8) , D. Zerwas (8) , Zhiqing Zhang (8)
G. Aad
N. Berger
C. Goy
T. Hryn'Ova
E. Cogneras
F. Vannucci
  • Fonction : Auteur
C. Cerna
Y. Coadou
M. Kuna
E. Monnier
J. Odier
  • Fonction : Auteur
  • PersonId : 1433897
E. Augé
C. Collard
Sara Diglio
D. Rousseau
D. Zerwas
  • Fonction : Auteur
  • PersonId : 842996
Zhiqing Zhang
  • Fonction : Auteur
  • PersonId : 829631

Résumé

Measurements are presented from proton-proton collisions at centre-of-mass energies of sqrt(s) = 0.9, 2.36 and 7 TeV recorded with the ATLAS detector at the LHC. Events were collected using a single-arm minimum-bias trigger. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are measured. Measurements in different regions of phase-space are shown, providing diffraction-reduced measurements as well as more inclusive ones. The observed distributions are corrected to well-defined phase-space regions, using model-independent corrections. The results are compared to each other and to various Monte Carlo models, including a new AMBT1 PYTHIA 6 tune. In all the kinematic regions considered, the particle multiplicities are higher than predicted by the Monte Carlo models. The central charged-particle multiplicity per event and unit of pseudorapidity, for tracks with pT >100 MeV, is measured to be 3.483 +- 0.009 (stat) +- 0.106 (syst) at sqrt(s) = 0.9 TeV and 5.630 +- 0.003 (stat) +- 0.169 (syst) at sqrt(s) = 7 TeV.

Dates et versions

in2p3-00554914 , version 1 (11-01-2011)

Identifiants

Citer

G. Aad, B. Aubert, M. Aurousseau, N. Berger, J. Colas, et al.. Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC. New Journal of Physics, 2011, 13, pp.053033. ⟨10.1088/1367-2630/13/5/053033⟩. ⟨in2p3-00554914⟩
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