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Title

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

AuthorsAad, G.; Amorós, Gabriel CSIC; Cabrera, Susana CSIC ORCID; Castillo, Mª Victoria CSIC ORCID; Costa, María José CSIC ORCID; Escobar, Carlos CSIC ORCID ; Ferrer, Antonio CSIC ORCID; Fuster, Juan CSIC ORCID; García García, Carmen CSIC ORCID; González de la Hoz, Santiago CSIC ORCID; Hernández Jiménez, Yesenia CSIC ORCID; Higón, Emilio CSIC ORCID; Irles Quiles, Adrián CSIC ORCID; Kaci, Mohamed CSIC; Lacasta Llácer, Carlos CSIC ORCID ; Lacuesta, Vicente CSIC; Martí García, Salvador CSIC ORCID; Miñano, Mercedes CSIC ORCID; Mitsou, Vasiliki A. CSIC ORCID ; Moles Valls, Regina CSIC ORCID; Moreno Llácer, María CSIC ORCID; Oliver García, Elena CSIC ORCID; Pérez García-Estañ, María Teresa CSIC; Ros, Eduardo CSIC ORCID; Salt, José CSIC ORCID; Sánchez Martínez, Javier CSIC ORCID; Sanchís Lozano, Miguel Ángel CSIC ORCID; Solans, Carlos CSIC; Torró Pastor, Emma CSIC ORCID; Valladolid Gallego, Eva CSIC; Valls Ferrer, Juan Antonio CSIC ORCID; Villaplana Pérez, Miguel CSIC ORCID; Vos, Marcel CSIC ORCID; Wildauer, Andreas CSIC; ATLAS Collaboration
Issue Date26-Apr-2010
PublisherElsevier
CitationPhysics Letters - Section B 688 (1): 21-42 (2010)
AbstractThe 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.
Description22 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
URIhttp://hdl.handle.net/10261/27707
DOI10.1016/j.physletb.2010.03.064
ISSN0370-2693
Appears in Collections:(IFIC) Artículos

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