TY - JOUR
T1 - Charged-Particle Multiplicities In pp Interactions Measured With the Atlas Detector At the Lhc
AU - Aad, G
AU - Charlton, David
AU - Bracinik, Juraj
AU - Hawkes, Christopher
AU - Head, Simon
AU - Hillier, Stephen
AU - Thomas, Jurgen
AU - Thompson, Paul
AU - Watkins, Peter
AU - Watson, Miriam
AU - Watson, Alan
AU - Bansil, Hardeep
AU - Curtis, Christopher
AU - Dowell, John
AU - Garvey, John
AU - Hadley, David
AU - Harrison, K
AU - Mahout, G
AU - Martin, Timothy
AU - McLaughlan, Thomas
AU - Newman, Paul
AU - Palmer, Jody
AU - Slater, Mark
AU - Wilson, John
AU - Collins, NJ
PY - 2011/5/19
Y1 - 2011/5/19
N2 - Measurements are presented from proton-proton collisions at centre-of-mass energies of root s = 0.9, 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 p(T) > 100 MeV, is measured to be 3.483 +/- 0.009 (stat) +/- 0.106 (syst) at root s = 0.9 TeV and 5.630 +/- 0.003 (stat) +/- 0.169 (syst) at root s = 7 TeV.
AB - Measurements are presented from proton-proton collisions at centre-of-mass energies of root s = 0.9, 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 p(T) > 100 MeV, is measured to be 3.483 +/- 0.009 (stat) +/- 0.106 (syst) at root s = 0.9 TeV and 5.630 +/- 0.003 (stat) +/- 0.169 (syst) at root s = 7 TeV.
U2 - 10.1088/1367-2630/13/5/053033
DO - 10.1088/1367-2630/13/5/053033
M3 - Article
VL - 13
SP - 053033-
JO - New Journal of Physics
JF - New Journal of Physics
IS - 5
ER -