Charged-particle multiplicities in pp interactions at sqrt(s) = 900 GeV measured with the ATLAS detector at the LHC
(2010) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 688, n° 1, p. 21-42 (2010)
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- Abstract
- he 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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The ATLAS Collaboration, Aad, G., Jez, P., & et al. (2010). Charged-particle multiplicities in pp interactions at sqrt(s) = 900 GeV measured with the ATLAS detector at the LHC. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 688(1), 21-42. https://doi.org/10.1016/j.physletb.2010.03.064 (Original work published 2010)