Centers and Institutes
Published May 31, 2011 | Version v1
Journal article Open

Measurement of underlying event characteristics using charged particles in $pp$ collisions at $\sqrt{s}=900$ $GeV$ and 7 TeV with the ATLAS detector

Creators

  • 1. Albert-Ludwigs-Universität
  • 2. University of Oklahoma
  • 3. Universitat Autònoma de Barcelona
  • 4. Université de Genève
  • 5. Oxford University
  • 6. Azerbaijan Academy of Sciences
  • 7. Oklahoma State University
  • 8. Michigan State University
  • 9. Tel Aviv University
  • 10. Université Paris-Sud
  • 11. INFN Sezione di Milano
  • 12. Università di Udine
  • 13. University of Bonn
  • 14. Brookhaven National Laboratory
  • 15. Hampton University
  • 16. Yale University
  • 17. University of Chicago

Description

Measurements of charged particle distributions, sensitive to the underlying event, have been performed with the ATLAS detector at the LHC. The measurements are based on data collected using a minimum-bias trigger to select proton-proton collisions at center-of-mass energies of 900 GeV and 7 TeV. The "underlying event" is defined as those aspects of a hadronic interaction attributed not to the hard scattering process, but rather to the accompanying interactions of the rest of the proton. Three regions are defined in azimuthal angle with respect to the highest transverse momentum charged particle in the event, such that the region transverse to the dominant momentum-flow is most sensitive to the underlying event. In each of these regions, distributions of the charged particle multiplicity, transverse momentum density, and average are measured. The data show generally higher underlying event activity than that predicted by Monte Carlo models tuned to pre-LHC data.

Notes

Due to the large number of authors, only the first 20 and the University of Chicago authors are included on the above author list. Please download the article for the complete list of authors.

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PhysRevD.83.112001.pdf

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Additional details

Identifiers

DOI
10.1103/PhysRevD.83.112001
Other
oai:uchicago.tind.io:12458

Funding

Agencia Nacional de Promoción Científica y Tecnológica
Yerevan Physics Institute
Australian Research Council
Bundesministerium für Bildung, Wissenschaft und Forschung
Azerbaijan National Academy of Sciences
SSTC
National Council for Scientific and Technological Development
Fundação de Amparo à Pesquisa do Estado de São Paulo
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Canada Foundation for Innovation
CERN
Consejo Nacional de Innovación, Ciencia y Tecnología
Chinese Academy of Sciences
Ministry of Science and Technology
National Natural Science Foundation of China
Ministerio de Ciencia, Tecnología e Innovación
Ministry of Education, Youth and Sports
Ministry of Industry and Trade
VSC CR
Danish National Research Foundation
Danish Natural Sciences Research Council
Lundbeck Foundation
ARTEMIS
Institut National de Physique Nucléaire et de Physique des Particules
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Georgian National Academy of Sciences
Bundesministerium für Forschung, Technologie und Raumfahrt
Deutsche Forschungsgemeinschaft
HGF
MPG
AvH Foundation
GSRT
ISF
MINERVA
GIF
DIP
Benoziyo Center
INFN
MEXT
JSPS
CNRST
FOM
NWO
RCN
MNiSW
Gabinete de Relações Internacionais da Ciência e do Ensino Superior
Fundação para a Ciência e Tecnologia
MERYS (MECTS)
MES of Russia
Rosatom (Russia)
Joint Institute for Nuclear Research
Ministry of Education, Science and Technological Development
MSSR
The Slovenian Research and Innovation Agency
Ministry of Science Technology and Higher Education
DST/NRF
Ministerio de Ciencia, Innovación y Universidades
Stockholm Resilience Centre
Wallenberg Foundation
SER
Swiss National Science Foundation
Cantons of Bern and Geneva
National Science and Technology Council
Turkish Atomic Energy Authority
Science and Technology Facilities Council
Royal Society
Leverhulme Trust
U.S. Department of Energy
National Science Foundation

UChicago Information

Division(s)
Physical Sciences Division
Department(s)
Enrico Fermi Institute