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

Christos Leonidopoulos, The CMS Collaboration

Research output: Contribution to journalArticlepeer-review

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 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 |η|<2, p T >0.5 GeV/c, and azimuthal direction transverse to that of the leading object.
Original languageEnglish
Pages (from-to)555-572
Number of pages18
JournalEuropean Physical Journal C
VolumeC70
DOIs
Publication statusPublished - Dec 2010

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