TY - JOUR
T1 - First measurement of the underlying event activity at the LHC with s√=0.9 TeV
AU - Leonidopoulos, Christos
AU - Collaboration, The CMS
PY - 2010/12
Y1 - 2010/12
N2 - 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.
AB - 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.
U2 - 10.1140/epjc/s10052-010-1453-9
DO - 10.1140/epjc/s10052-010-1453-9
M3 - Article
VL - C70
SP - 555
EP - 572
JO - European Physical Journal C
JF - European Physical Journal C
SN - 1434-6044
ER -