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Abdallah, J; Almond, J; Barnett, B M; Benhammou, Y; Benoit, M; Bernat, P; Bernius, C; Bini, C; Black, K M; Brandt, G; Braun, H M; Buckingham, R M; Coccaro, A; Cogan, J G; Colijn, A P; Da Silva, P V M; Dittus, F; Dobson, M; Dohmae, T; Dotti, A; Favareto, A; Fedorko, W; Gentile, S; Giokaris, N; Gorbounov, P A; Gorski, B T; Grishkevich, Y V; Guicheney, C; Gusakov, Y; Hadley, D R; Haefner, P; Hansen, J R; Hauff, D; Houlden, M A; Hristova, I; Huffman, T B; Huseynov, N; Iwasaki, H; Kapliy, A; Kiryunin, A E; Kowalewski, R; Lenzi, B; Lester, C G; Liberti, B; Linnemann, J T; Manjavidze, I D; Marroquim, F; McCarthy, R L; Mcfayden, J A; Mendoza Navas, L; Moeller, V; Mount, R; Mueller, K; Nakahama, Y; Nakano, I; Nebot, E; Nunes Hanninger, G; Olszewski, A; Pérez García-Estañ, M T; Persembe, S; Policicchio, A; Polychronakos, V; Psoroulas, S; Reeves, K; Romeo, G; Ros, E; Rossi, L P; Rozen, Y; Salt, J; Schwanenberger, C; Searcy, J; Seidel, S C; Seman, M; Sidoti, A; Soni, N; Sorbi, M; Stanek, R W; Stockton, M C; Takeda, H; Tanaka, S; Tappern, G P; Testa, M; Toczek, B; Turecek, D; van der Poel, E; van der Ster, D; Vilucchi, E; Vitale, A; Voss, R; Watts, S; Wells, P S; Wheeler-Ellis, S J; Wilkens, H G; Will, J Z; Yorita, K; Yoshida, R; Zerwas, D; Zilka, B; Ziolkowski, M; zur Nedden, M
New journal of physics, 2011, Letnik: 13, Številka: 5Journal Article
Measurements are presented from proton-proton collisions at centre-of-mass energies of root 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 (MC) models, including a new AMBT1 pythia6 tune. In all the kinematic regions considered, the particle multiplicities are higher than predicted by the MC models. The central charged-particle multiplicity per event and unit of pseudorapidity, for tracks with p(T) > 100 MeV, is measured to be 3.483 +/- 0.009 (stat) +/- 0.106 (syst) at root s = 0.9 TeV and 5.630 +/- 0.003 (stat) +/- 0.169 (syst) at root s = 7 TeV.
