First measurement of the underlying event activity at the LHC with [square root of s] = 0.9 TeV

A measurement of the underlying activity in scattering processes with [p.sub.T] scale in the GeV region is performed in proton-proton collisions at [square root of s] = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direct...

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Bibliographic Details
Published inThe European physical journal. C, Particles and fields Vol. 70; no. 3; pp. 555 - 572
Format Journal Article
LanguageEnglish
Published Springer 01.12.2010
Subjects
Analysis
Collisions (Nuclear physics)
Detectors
Measurement
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Summary:A measurement of the underlying activity in scattering processes with [p.sub.T] scale in the GeV region is performed in proton-proton collisions at [square root of 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 [absolute value of η] < 2, [p.sub.T] > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-010-1453-9