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Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC

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Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC

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ATLAS Collaboration; Salt Cairols, José; Higón Rodríguez, Emilio; González de la Hoz, Santiago; Castillo Giménez, María Victoria; Ferrer Soria, Antonio; Sanchis Lozano, Miguel Ángel; Hernández Jiménez, Yesenia; Ros Martínez, Eduardo; García García, Carmen; Fuster Verdú, Juan A.; Martí García, Salvador; Lacasta Llácer, Carlos; Valls Ferrer, Juan Antonio; Villaplana Pérez, Miguel

Aquest document és un/a article, creat/da en: 2010

Este documento está disponible también en : 10.1016/j.physletb.2010.03.064

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 |eta|<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 eta = 0 is measured to be 1.333 +/- 0.003 (stat.) +/- 0.040 (syst.), which is 5-15% higher than the Monte Carlo models predict.

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