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

ATLAS Collaboration

doi:10.1016/j.physletb.2010.03.064

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

ATLAS Collaboration

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Research output: Contribution to journal › Article › peer-review

185 Scopus citations

Abstract

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 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 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.

Original language	English
Pages (from-to)	21-42
Number of pages	22
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	688
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2010.03.064
State	Published - 26 Apr 2010
Externally published	Yes

Keywords

900 GeV
ATLAS
Charged-particle
LHC
Minimum bias
Multiplicities

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10.1016/j.physletb.2010.03.064

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@article{4a94f6d87c24433883e59a937c683f09,

title = "Charged-particle multiplicities in pp interactions at √ s = 900 GeV measured with the ATLAS detector at the LHC",

abstract = "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.",

keywords = "900 GeV, ATLAS, Charged-particle, LHC, Minimum bias, Multiplicities",

author = "G. Aad and E. Abat and B. Abbott and J. Abdallah and S. Kabana and \{ATLAS Collaboration\}",

note = "Publisher Copyright: {\textcopyright} CERN, for the benefit of the ATLAS Collaboration.",

year = "2010",

month = apr,

day = "26",

doi = "10.1016/j.physletb.2010.03.064",

language = "English",

volume = "688",

pages = "21--42",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

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

AU - Aad, G.

AU - Abat, E.

AU - Abbott, B.

AU - Abdallah, J.

AU - Kabana, S.

AU - ATLAS Collaboration

N1 - Publisher Copyright: © CERN, for the benefit of the ATLAS Collaboration.

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.

KW - 900 GeV

KW - ATLAS

KW - Charged-particle

KW - LHC

KW - Minimum bias

KW - Multiplicities

UR - https://www.scopus.com/pages/publications/84864623625

U2 - 10.1016/j.physletb.2010.03.064

DO - 10.1016/j.physletb.2010.03.064

M3 - Article

AN - SCOPUS:84864623625

SN - 0370-2693

VL - 688

SP - 21

EP - 42

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1

ER -

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

Abstract

Keywords

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