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| Authors | G. Aad, S. Bentvelsen, A.P. Colijn, P. de Jong, A. Doxiadis, H. Garitaonandia, M. Gosselink, M.S. Kayl, E. Koffeman, H. Lee, J. Mechnich, I. Mussche, J.P. Ottersbach, M. Rijpstra, N. Ruckstuhl, M. Tsiakiris, E. van der Kraaij, E. van der Poel, Z. van Kesteren, I. van Vulpen, J.C. Vermeulen, M. Vreeswijk | | Title | Charged-particle multiplicities in pp interactions at sqrt(s) = 900 GeV measured with the ATLAS detector at the LHC |
| Journal | Physics Letters B |
| Volume | 688 |
| Year | 2010 |
| Issue | 1 |
| Pages | 21-42 |
| ISSN | 03702693 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Institute for High Energy Physics (IHEF) |
| Abstract | The first measurements from proton–proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range |η|<2.5 and pT>500 MeV. The measurements are compared to Monte Carlo models of proton–proton collisions and to results from other experiments at the same centre-of-mass energy. The charged-particle multiplicity per event and unit of pseudorapidity at η=0 is measured to be 1.333±0.003(stat.)±0.040(syst.), which is 5–15% higher than the Monte Carlo models predict. |
| Document type | Article |
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