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

TY - JOUR

T1 - Charged-particle multiplicities in pp interactions at root s=900 GeV measured with the ATLAS detector at the LHC ATLAS Collaboration

AU - Aad...[et al.], G.

AU - Abat, E.

AU - Abbott, B.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Jørn Dines

AU - Hansen, John Renner

AU - Hansen, Peter Henrik

AU - Xella, Stefania

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

PY - 2010/4/26

Y1 - 2010/4/26

N2 - 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 chargedparticle multiplicity are measured for events with at least one charged particle in the kinematic range |η| < 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 η = 0 is measured to be 1.333 ± 0.003(stat.) ± 0.040(syst.), which is 5-15% higher than the Monte Carlo models predict.

AB - 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 chargedparticle multiplicity are measured for events with at least one charged particle in the kinematic range |η| < 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 η = 0 is measured to be 1.333 ± 0.003(stat.) ± 0.040(syst.), which is 5-15% higher than the Monte Carlo models predict.

U2 - 10.1016/j.physletb.2010.03.064

DO - 10.1016/j.physletb.2010.03.064

M3 - Journal article

SN - 0370-2693

VL - 688

SP - 21

EP - 42

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -