Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC
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 a...
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| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2011
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125349 |
| Aporte de: |
| Sumario: | 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<sub>T</sub> > 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. |
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