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Measurement of the underlying event in jet events from 7 proton-proton collisions with the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0003-3867-0336
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Rekke forfattare: 28752014 (engelsk)Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 74, nr 8, s. 2965-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Distributions sensitive to the underlying event in QCD jet events have been measured with the ATLAS detector at the LHC, based on of proton-proton collision data collected at a centre-of-mass energy of 7 . Charged-particle mean and densities of all-particle and charged-particle multiplicity and have been measured in regions azimuthally transverse to the hardest jet in each event. These are presented both as one-dimensional distributions and with their mean values as functions of the leading-jet transverse momentum from 20 to 800 . The correlation of charged-particle mean with charged-particle multiplicity is also studied, and the densities include the forward rapidity region; these features provide extra data constraints for Monte Carlo modelling of colour reconnection and beam-remnant effects respectively. For the first time, underlying event observables have been computed separately for inclusive jet and exclusive dijet event selections, allowing more detailed study of the interplay of multiple partonic scattering and QCD radiation contributions to the underlying event. Comparisons to the predictions of different Monte Carlo models show a need for further model tuning, but the standard approach is found to generally reproduce the features of the underlying event in both types of event selection.

sted, utgiver, år, opplag, sider
2014. Vol. 74, nr 8, s. 2965-
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URN: urn:nbn:se:kth:diva-150950DOI: 10.1140/epjc/s10052-014-2965-5ISI: 000340543600001Scopus ID: 2-s2.0-84908304404OAI: oai:DiVA.org:kth-150950DiVA, id: diva2:745893
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QC 20140911

Tilgjengelig fra: 2014-09-11 Laget: 2014-09-11 Sist oppdatert: 2019-12-04bibliografisk kontrollert

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Jovicevic, JelenaKuwertz, EmmaJensen, BengtMorley, AnthonyStrandberg, Jonas
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