First Measurement of the Underlying Event Activity at the LHC with √s = 0.9 TeV
Author(s)
CMS Collaboration; Alver, Burak Han; Bauer, Gerry P; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; D'Enterria, David; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Harris, Philip Coleman; Chan, M.; ... Show more Show less
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A measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton-proton collisions at √s = 0.9 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 {pipe}η{pipe} < 2, p T > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.
Date issued
2010-11Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
European Physical Journal C: Particles and Fields
Publisher
European Physical Journal C: Particles and Fields
Citation
Khachatryan, V. et al. “First Measurement of the Underlying Event Activity at the LHC with √s = 0.9 TeV.” The European Physical Journal C 70, 3 (November 2010): 555–572 © CERN for benefit of the CMS collaboration 2010
Version: Final published version
ISSN
1434-6044
1434-6052