Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV

Details Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV Measurement of the Underlying Event Activity in Proton-Proton Collisions at 0.9 TeV

2010-06-10

arxiv.org/abs/1006.2083v1

Eur.Phys.J.C70:555-572,2010

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1140/epjc/s10052-010-1453-9

A measurement of the underlying activity in scattering processes with transverse momentum scale in the GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged hadron 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 hadrons with pseudorapidity eta < 2, p_T > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.

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