@article{207d3ef31bcf429b91883fe97f93bc7d,

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 = "{Atlas Collaboration} and G. Aad and E. Abat and B. Abbott and J. Abdallah and Abdelalim, {A. A.} and A. Abdesselam and O. Abdinov and B. Abi and M. Abolins and H. Abramowicz and H. Abreu and E. Acerbi and Acharya, {B. S.} and Adams, {D. L.} and Addy, {T. N.} and J. Adelman and M. Aderholz and C. Adorisio and P. Adragna and T. Adye and S. Aefsky and Aguilar-Saavedra, {J. A.} and M. Aharrouche and Ahlen, {S. P.} and F. Ahles and A. Ahmad and H. Ahmed and G. Aielli and T. Akdogan and {\AA}kesson, {P. F.} and {\AA}kesson, {T. P.A.} and G. Akimoto and Akimov, {A. V.} and A. Aktas and Alam, {M. S.} and Alam, {M. A.} and J. Albert and S. Albrand and M. Aleksa and Aleksandrov, {I. N.} and M. Aleppo and F. Alessandria and C. Alexa and G. Alexander and G. Alexandre and T. Alexopoulos and M. Alhroob and M. Aliev and G. Alimonti and J. Alison and M. Aliyev and Allport, {P. P.} and Allwood-Spiers, {S. E.} and J. Almond and A. Aloisio and R. Alon and A. Alonso and J. Alonso and Alviggi, {M. G.} and K. Amako and P. Amaral and G. Ambrosini and G. Ambrosio and C. Amelung and Ammosov, {V. V.} and A. Amorim and G. Amor{\'o}s and N. Amram and C. Anastopoulos and T. Andeen and Anders, {C. F.} and Anderson, {K. J.} and A. Andreazza and V. Andrei and Andrieux, {M. L.} and Anduaga, {X. S.} and Burton Budick and Kyle Cranmer and Andrew Haas and Marta Losada and Mincer, {A. I.} and P. Nemethy",

year = "2010",

month = apr,

day = "26",

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

language = "English (US)",

volume = "688",

pages = "21--42",

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

issn = "0370-2693",

publisher = "Elsevier",

number = "1",

}