Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC.

Aad, G and Abbott, B. and Abdallah, J. and Abdelalim, A .A. and Abdesselam, A. and Abdinov, O. and Abi, B. and Abolins, M. and Bell, William, The ATLAS collaboration (2011) Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC. New Journal of Physics, 13 (053033). 053033. ISSN 1367-2630

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    Abstract

    Measurements are presented from proton–proton collisions at centre-of-mass energies of , 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 pT>100 MeV, is measured to be 3.483±0.009 (stat)±0.106 (syst) at and 5.630±0.003 (stat)±0.169 (syst) at .

    ORCID iDs

    Aad, G, Abbott, B., Abdallah, J., Abdelalim, A .A., Abdesselam, A., Abdinov, O., Abi, B., Abolins, M. and Bell, William ORCID logoORCID: https://orcid.org/0000-0002-0138-8639;
    • Item type:Article
      ID code:74861
      Dates:
      Date
      Event
      19 May 2011
      Published
      Notes:G Aad et al 2011 New J. Phys. 13 053033
      Keywords:ATLAS detector, LHC, charged-particle multiplicities, proton–proton collisions, Physics, Mathematics, Physics and Astronomy(all), Mathematics(all), Computer Science(all)
      Subjects:Science > Physics
      Science > Mathematics
      Department:Faculty of Science > Computer and Information Sciences
      Depositing user: Pure Administrator
      Date deposited:10 Dec 2020 13:30
      Last modified:10 Sep 2021 03:13
      URI:https://strathprints.strath.ac.uk/id/eprint/74861
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