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First measurement of the underlying event activity at the LHC with √s = 0.9 TeV


CMS Collaboration; Khachatryan, V; Amsler, C; Chiochia, V; De Visscher, S (2010). First measurement of the underlying event activity at the LHC with √s = 0.9 TeV. European Physical Journal C - Particles and Fields, 70(3):555-572.

Abstract

A measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton–proton collisions at TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged particles with pseudorapidity |η|<2, p T >0.5 GeV/c, and azimuthal direction transverse to that of the leading object.

A measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton–proton collisions at TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged particles with pseudorapidity |η|<2, p T >0.5 GeV/c, and azimuthal direction transverse to that of the leading object.

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32 citations in Web of Science®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2010
Deposited On:14 Feb 2011 19:20
Last Modified:05 Apr 2016 14:46
Publisher:Springer
ISSN:1434-6044
Publisher DOI:https://doi.org/10.1140/epjc/s10052-010-1453-9
Related URLs:http://arxiv.org/abs/1006.2083
Permanent URL: https://doi.org/10.5167/uzh-45550

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