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Measurement of underlying event characteristics using charged particles in pp collisions at root s = 900 GeV and 7 TeV with the ATLAS detector
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
2011 (engelsk)Inngår i: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 83, nr 11, s. 112001-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Measurements of charged particle distributions, sensitive to the underlying event, have been performed with the ATLAS detector at the LHC. The measurements are based on data collected using a minimum-bias trigger to select proton-proton collisions at center-of-mass energies of 900 GeV and 7 TeV. The "underlying event'' is defined as those aspects of a hadronic interaction attributed not to the hard scattering process, but rather to the accompanying interactions of the rest of the proton. Three regions are defined in azimuthal angle with respect to the highest transverse momentum charged particle in the event, such that the region transverse to the dominant momentum-flow is most sensitive to the underlying event. In each of these regions, distributions of the charged particle multiplicity, transverse momentum density, and average p(T) are measured. The data show generally higher underlying event activity than that predicted by Monte Carlo models tuned to pre-LHC data.

sted, utgiver, år, opplag, sider
2011. Vol. 83, nr 11, s. 112001-
Emneord [en]
DUAL PARTON MODEL, DISTRIBUTIONS, PHOTOPRODUCTION, LHC
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-35300DOI: 10.1103/PhysRevD.83.112001ISI: 000291091000001Scopus ID: 2-s2.0-79960782937OAI: oai:DiVA.org:kth-35300DiVA, id: diva2:427065
Forskningsfinansiär
Swedish Research Council
Merknad
QC 20110627Tilgjengelig fra: 2011-06-27 Laget: 2011-06-27 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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