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

Publication ,  Journal Article
Aad, G; Abat, E; Abbott, B; Abdallah, J; Abdelalim, AA; Abdesselam, A; Abdinov, O; Abi, B; Abolins, M; Abramowicz, H; Abreu, H; Acerbi, E ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
April 26, 2010

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.

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Published In

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

DOI

ISSN

0370-2693

Publication Date

April 26, 2010

Volume

688

Issue

1

Start / End Page

21 / 42

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Aad, G., Abat, E., Abbott, B., Abdallah, J., Abdelalim, A. A., Abdesselam, A., … Armbruster, A. J. (2010). Charged-particle multiplicities in pp interactions at √ s = 900 GeV measured with the ATLAS detector at the LHC. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 688(1), 21–42. https://doi.org/10.1016/j.physletb.2010.03.064
Aad, G., E. Abat, B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, et al. “Charged-particle multiplicities in pp interactions at √ s = 900 GeV measured with the ATLAS detector at the LHC.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 688, no. 1 (April 26, 2010): 21–42. https://doi.org/10.1016/j.physletb.2010.03.064.
Aad G, Abat E, Abbott B, Abdallah J, Abdelalim AA, Abdesselam A, et al. Charged-particle multiplicities in pp interactions at √ s = 900 GeV measured with the ATLAS detector at the LHC. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2010 Apr 26;688(1):21–42.
Aad, G., et al. “Charged-particle multiplicities in pp interactions at √ s = 900 GeV measured with the ATLAS detector at the LHC.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 688, no. 1, Apr. 2010, pp. 21–42. Scopus, doi:10.1016/j.physletb.2010.03.064.
Aad G, Abat E, Abbott B, Abdallah J, Abdelalim AA, Abdesselam A, Abdinov O, Abi B, Abolins M, Abramowicz H, Abreu H, Acerbi E, Acharya BS, Ackers M, Adams DL, Addy TN, Adelman J, Aderholz M, Adorisio C, Adragna P, Adye T, Aefsky S, Aguilar-Saavedra JA, Aharrouche M, Ahlen SP, Ahles F, Ahmad A, Ahmed H, Ahsan M, Aielli G, Akdogan T, Åkesson PF, Åkesson TPA, Akimoto G, Akimov AV, Aktas A, Alam MS, Alam MA, Albert J, Albrand S, Aleksa M, Aleksandrov IN, Aleppo M, Alessandria F, Alexa C, Alexander G, Alexandre G, Alexopoulos T, Alhroob M, Aliev M, Alimonti G, Alison J, Aliyev M, Allport PP, Allwood-Spiers SE, Almond J, Aloisio A, Alon R, Alonso A, Alonso J, Alviggi MG, Amako K, Amaral P, Ambrosini G, Ambrosio G, Amelung C, Ammosov VV, Amorim A, Amorós G, Amram N, Anastopoulos C, Andeen T, Anders CF, Anderson KJ, Andreazza A, Andrei V, Andrieux ML, Anduaga XS, Angerami A, Anghinolfi F, Anjos N, Annovi A, Antonaki A, Antonelli M, Antonelli S, Antos J, Antunovic B, Anulli F, Aoun S, Arabidze G, Aracena I, Arai Y, Arce ATH, Archambault JP, Arfaoui S, Arguin JF, Argyropoulos T, Arik E, Arik M, Armbruster AJ. Charged-particle multiplicities in pp interactions at √ s = 900 GeV measured with the ATLAS detector at the LHC. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2010 Apr 26;688(1):21–42.
Journal cover image

Published In

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

DOI

ISSN

0370-2693

Publication Date

April 26, 2010

Volume

688

Issue

1

Start / End Page

21 / 42

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics