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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 D. 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 S. 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
Abstract : 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.
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Submitted on : Tuesday, January 11, 2011 - 4:51:21 PM
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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, Institute of Physics: Open Access Journals, 2011, 13, pp.053033. ⟨10.1088/1367-2630/13/5/053033⟩. ⟨in2p3-00554914⟩

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