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

Authors:Aad, G.
Amorós, Gabriel
Cabrera, Susana
Castillo, Mª Victoria
Costa, María José
Escobar, Carlos
Ferrer, Antonio
Fuster, Juan
García García, Carmen
González de la Hoz, Santiago
Hernández Jiménez, Yesenia
Higón, Emilio
Irles Quiles, Adrián
Kaci, Mohamed
Lacasta Llácer, Carlos
Lacuesta, Vicente
Martí García, Salvador
Miñano, Mercedes
Mitsou, Vasiliki A.
Moles Valls, Regina
Moreno Llácer, María
Oliver García, Elena
Pérez García-Estañ, María Teresa
Ros, Eduardo
Salt, José
Sánchez Martínez, Javier
Sanchís Lozano, Miguel Ángel
Solans, Carlos
Torró Pastor, Emma
Valladolid Gallego, Eva
Valls Ferrer, Juan Antonio
Villaplana Pérez, Miguel
Vos, Marcel
Wildauer, Andreas
ATLAS Collaboration
Issue Date:26-Apr-2010
Citation:Physics Letters - Section B 688 (1): 21-42 (2010)
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 vertical bar eta vertical bar < 2.5 and P-T > 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 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.
Description:22 páginas, 4 figuras, 1 tabla.-- et al.(ATLAS Collaboration).-- arXiv:1003.3124v2
Publisher version (URL):http://dx.doi.org/10.1016/j.physletb.2010.03.064
Appears in Collections:(IFIC) Artículos

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