Publication
Title
Measurement of the underlying event activity at the LHC with $\sqrt{s}$ = 7 TeV and comparison with $\sqrt{s}$ = 09 TeV
Author
Institution/Organisation
CMS Collaboration
Abstract
 A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at s=09 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η| < 2 and transverse momentum p T  > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-p T sum of the particles in the transverse region is observed with increasing p T of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet p T larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in pythia are compared to the data.
Language
English
Source (journal)
Journal of high energy physics. - Bristol
Publication
Bristol : 2011
ISSN
1126-6708
1029-8479 [online]
Volume/pages
9(2011), p. 1-31
Article Reference
109
ISI
000296086700034
Medium
E-only publicatie
Full text (Publishers DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address