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Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
University of Chicago.ORCID-id: 0000-0002-8913-0981
Vise andre og tillknytning
Rekke forfattare: 30382011 (engelsk)Inngår i: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 13, s. 053033-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2011. Vol. 13, s. 053033-
Emneord [en]
TRANSVERSE-MOMENTUM SPECTRA, SQUARE-ROOT-S, CM ENERGIES, DISTRIBUTIONS, COLLISIONS, COLLIDER, TEV
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Identifikatorer
URN: urn:nbn:se:kth:diva-36441DOI: 10.1088/1367-2630/13/5/053033ISI: 000292002100003Scopus ID: 2-s2.0-81555215516OAI: oai:DiVA.org:kth-36441DiVA, id: diva2:430794
Merknad
QC 20110711. Antal författare 3 038.Tilgjengelig fra: 2011-07-12 Laget: 2011-07-12 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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