Artigo
First measurement of the underlying event activity at the LHC with √ = 0.9 TeV
Fecha
2010-12-01Registro en:
European Physical Journal C, v. 70, n. 3, p. 555-572, 2010.
1434-6044
1434-6052
10.1140/epjc/s10052-010-1453-9
2-s2.0-78651432547
2-s2.0-78651432547.pdf
Autor
Yerevan Physics Institute
Institut für Hochenergiephysik der OeAW
National Centre for Particle and High Energy Physics
Universiteit Antwerpen
Vrije Universiteit Brussel
Université Libre de Bruxelles
Ghent University
Université Catholique de Louvain
Université de Mons
Centro Brasileiro de Pesquisas Físicas (CBPF)
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (Unesp)
Institute for Nuclear Research and Nuclear Energy
University of Sofia
Institute of High Energy Physics
Peking University
Universidad de los Andes
Technical University of Split
University of Split
Institute Rudjer Boskovic
University of Cyprus
Academy of Scientific Research and Technology of the Arab Republic of Egypt
National Institute of Chemical Physics and Biophysics
University of Helsinki
Helsinki Institute of Physics
Lappeenranta University of Technology
IN2P3-CNRS
CEA/Saclay
CNRS/IN2P3
Centre de Calcul de l'Institut National de Physique Nucleaire et de Physique des Particules (IN2P3)
Université de Lyon, Université Claude Bernard Lyon 1
Academy of Science
RWTH Aachen University
Deutsches Elektronen-Synchrotron
University of Hamburg
Institut für Experimentelle Kernphysik
Institute of Nuclear Physics Demokritos
University of Athens
University of Ioánnina
KFKI Research Institute for Particle and Nuclear Physics
Institute of Nuclear Research ATOMKI
University of Debrecen
Panjab University
University of Delhi
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research - EHEP
Tata Institute of Fundamental Research - HECR
Institute for Studies in Theoretical Physics and Mathematics (IPM)
INFN Sezione di Bari
Università di Bari
Politecnico di Bari
INFN Sezione di Bologna
Università di Bologna
INFN Sezione di Catania
Università di Catania
INFN Sezione di Firenze
Università di Firenze
INFN Laboratori Nazionali di Frascati
INFN Sezione di Genova
INFN Sezione di Milano-Biccoca
Università di Milano-Bicocca
INFN Sezione di Napoli
Università di Napoli Federico II
INFN Sezione di Padova
Università di Padova
Università di Trento (Trento)
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Università di Pavia
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Università di Perugia
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Università di Pisa
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Università di Roma La Sapienza
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Università di Trieste
Kyungpook National University
Chonnam National University
Korea University
University of Seoul
Sungkyunkwan University
Vilnius University
Centro de Investigacion y de Estudios Avanzados del IPN
Universidad Iberoamericana
Benemerita Universidad Autonoma de Puebla
Universidad Autónoma de San Luis Potosí
University of Auckland
University of Canterbury
Quaid-I-Azam University
Institute of Experimental Physics
Soltan Institute for Nuclear Studies
Laboratório de Instrumentação e Física Experimental de Partículas (LIP)
Joint Institute for Nuclear Research
Petersburg Nuclear Physics Institute
Institute for Nuclear Research
Institute for Theoretical and Experimental Physics (ITEP)
Moscow State University
P.N. Lebedev Physical Institute
State Research Center of Russian Federation
University of Belgrade
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Universidad Autónoma de Madrid
Universidad de Oviedo
CSIC-Universidad de Cantabria
CERN, European Organization for Nuclear Research
Paul Scherrer Institut
ETH Zurich
Universität Zürich
National Central University
National Taiwan University (NTU)
Cukurova University
Middle East Technical University
Bogaziçi University
National Scientific Center
University of Bristol
Rutherford Appleton Laboratory
University of London
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Boston University
Brown University
University of California, Davis
University of California, Los Angeles
University of California, Riverside (UCR)
University of California, San Diego
University of California, Santa Barbara
California Institute of Technology
Carnegie Mellon University
University of Colorado at Boulder
Cornell University
Fairfield University
Fermi National Accelerator Laboratory
University of Florida
Florida International University
Florida State University
Florida Institute of Technology
University of Illinois at Chicago (UIC)
The University of Iowa
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Resumen
A measurement of the underlying activity in scattering processes with pT scale in the GeV region is performed in proton-proton collisions at √ = 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 {pipe}η{pipe} < 2, pT > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object. © 2010 CERN for benefit of the CMS collaboration.