https://doi.org/10.1140/epjc/s10052-011-1636-z
Regular Article - Experimental Physics
Measurements of underlying-event properties using neutral and charged particles in pp collisions at 
GeV and 
TeV with the ATLAS detector at the LHC
1
CERN, 1211, Geneva 23, Switzerland
2
University at Albany, Albany, NY, United States of America
3
Department of Physics, University of Alberta, Edmonton, AB, Canada
4
Department of Physics, Ankara University, Ankara, Turkey
5
Department of Physics, Dumlupinar University, Kutahya, Turkey
6
Department of Physics, Gazi University, Ankara, Turkey
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Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
8
Turkish Atomic Energy Authority, Ankara, Turkey
9
LAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, France
10
High Energy Physics Division, Argonne National Laboratory, Argonne, IL, United States of America
11
Department of Physics, University of Arizona, Tucson, AZ, United States of America
12
Department of Physics, The University of Texas at Arlington, Arlington, TX, United States of America
13
Physics Department, University of Athens, Athens, Greece
14
Physics Department, National Technical University of Athens, Zografou, Greece
15
Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
16
Institut de Física d’Altes Energies and Universitat Autònoma de Barcelona and ICREA, Barcelona, Spain
17
Institute of Physics, University of Belgrade, Belgrade, Serbia
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Vinca Institute of Nuclear Sciences, Belgrade, Serbia
19
Department for Physics and Technology, University of Bergen, Bergen, Norway
20
Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, United States of America
21
Department of Physics, Humboldt University, Berlin, Germany
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Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
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School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
24
Department of Physics, Bogazici University, Istanbul, Turkey
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Division of Physics, Dogus University, Istanbul, Turkey
26
Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
27
Department of Physics, Istanbul Technical University, Istanbul, Turkey
28
INFN Sezione di Bologna, Bologna, Italy
29
Dipartimento di Fisica, Università di Bologna, Bologna, Italy
30
Physikalisches Institut, University of Bonn, Bonn, Germany
31
Department of Physics, Boston University, Boston, MA, United States of America
32
Department of Physics, Brandeis University, Waltham, MA, United States of America
33
Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
34
Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, Brazil
35
Physics Department, Brookhaven National Laboratory, Upton, NY, United States of America
36
National Institute of Physics and Nuclear Engineering, Bucharest, Romania
37
University Politehnica Bucharest, Bucharest, Romania
38
West University in Timisoara, Timisoara, Romania
39
Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina
40
Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
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Department of Physics, Carleton University, Ottawa, ON, Canada
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CERN, Geneva, Switzerland
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Enrico Fermi Institute, University of Chicago, Chicago, IL, United States of America
44
Departamento de Fisica, Pontificia Universidad Católica de Chile, Santiago, Chile
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Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile
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Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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Department of Modern Physics, University of Science and Technology of China, Anhui, China
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Department of Physics, Nanjing University, Jiangsu, China
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High Energy Physics Group, Shandong University, Shandong, China
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Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Aubiere Cedex, France
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Nevis Laboratory, Columbia University, Irvington, NY, United States of America
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Niels Bohr Institute, University of Copenhagen, Kobenhavn, Denmark
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INFN Gruppo Collegato di Cosenza, Arcavata di Rende, Italy
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Dipartimento di Fisica, Università della Calabria, Arcavata di Rende, Italy
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Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
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The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
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Physics Department, Southern Methodist University, Dallas, TX, United States of America
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University of Texas at Dallas, Richardson, TX, United States of America
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DESY, Hamburg and Zeuthen, Germany
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Institut für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
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Institut für Kern- und Teilchenphysik, Technical University Dresden, Dresden, Germany
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Department of Physics, Duke University, Durham, NC, United States of America
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SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
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Fachhochschule Wiener Neustadt, Wiener Neustadt, Austria
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INFN Laboratori Nazionali di Frascati, Frascati, Italy
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Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg i.Br., Germany
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Section de Physique, Université de Genève, Geneva, Switzerland
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INFN Sezione di Genova, Genova, Italy
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Dipartimento di Fisica, Università di Genova, Genova, Italy
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Institute of Physics and HEP Institute, Georgian Academy of Sciences and Tbilisi State University, Tbilisi, Georgia
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II Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
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SUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
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II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany
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Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier and CNRS/IN2P3 and Institut National Polytechnique de Grenoble, Grenoble, France
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Department of Physics, Hampton University, Hampton, VA, United States of America
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Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, United States of America
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Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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ZITI Institut für technische Informatik, Ruprecht-Karls-Universität Heidelberg, Mannheim, Germany
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Faculty of Science, Hiroshima University, Hiroshima, Japan
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Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan
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Department of Physics, Indiana University, Bloomington, IN, United States of America
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Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
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University of Iowa, Iowa City, IA, United States of America
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Department of Physics and Astronomy, Iowa State University, Ames, IA, United States of America
86
JINR Dubna, Joint Institute for Nuclear Research, Dubna, Russia
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High Energy Accelerator Research Organization, KEK, Tsukuba, Japan
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Graduate School of Science, Kobe University, Kobe, Japan
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Faculty of Science, Kyoto University, Kyoto, Japan
90
Kyoto University of Education, Kyoto, Japan
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Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
92
Physics Department, Lancaster University, Lancaster, United Kingdom
93
INFN Sezione di Lecce, Lecce, Italy
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Dipartimento di Fisica, Università del Salento, Lecce, Italy
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Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
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Department of Physics, Jožef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia
97
Department of Physics, Queen Mary University of London, London, United Kingdom
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Department of Physics, Royal Holloway University of London, Surrey, United Kingdom
99
Department of Physics and Astronomy, University College London, London, United Kingdom
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Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France
101
Fysiska institutionen, Lunds universitet, Lund, Sweden
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Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, Spain
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Institut für Physik, Universität Mainz, Mainz, Germany
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School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
105
CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France
106
Department of Physics, University of Massachusetts, Amherst, MA, United States of America
107
Department of Physics, McGill University, Montreal, QC, Canada
108
School of Physics, University of Melbourne, Victoria, Australia
109
Department of Physics, The University of Michigan, Ann Arbor, MI, United States of America
110
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, United States of America
111
INFN Sezione di Milano, Milano, Italy
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Dipartimento di Fisica, Università di Milano, Milano, Italy
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B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Republic of Belarus
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National Scientific and Educational Centre for Particle and High Energy Physics, Minsk, Republic of Belarus
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Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, United States of America
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Group of Particle Physics, University of Montreal, Montreal, QC, Canada
117
P.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, Russia
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Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia
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Moscow Engineering and Physics Institute (MEPhI), Moscow, Russia
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Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
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Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany
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Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany
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Nagasaki Institute of Applied Science, Nagasaki, Japan
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Graduate School of Science, Nagoya University, Nagoya, Japan
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INFN Sezione di Napoli, Napoli, Italy
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Dipartimento di Scienze Fisiche, Università di Napoli, Napoli, Italy
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Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, United States of America
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Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands
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Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands
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Department of Physics, Northern Illinois University, DeKalb, IL, United States of America
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Budker Institute of Nuclear Physics (BINP), Novosibirsk, Russia
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Department of Physics, New York University, New York, NY, United States of America
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Ohio State University, Columbus, OH, United States of America
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Faculty of Science, Okayama University, Okayama, Japan
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Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States of America
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Department of Physics, Oklahoma State University, Stillwater, OK, United States of America
137
RCPTM, Palacký University, Olomouc, Czech Republic
138
Center for High Energy Physics, University of Oregon, Eugene, OR, United States of America
139
LAL, Univ. Paris-Sud and CNRS/IN2P3, Orsay, France
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Graduate School of Science, Osaka University, Osaka, Japan
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Department of Physics, University of Oslo, Oslo, Norway
142
Department of Physics, Oxford University, Oxford, United Kingdom
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INFN Sezione di Pavia, Pavia, Italy
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Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Pavia, Italy
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Department of Physics, University of Pennsylvania, Philadelphia, PA, United States of America
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Petersburg Nuclear Physics Institute, Gatchina, Russia
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INFN Sezione di Pisa, Pisa, Italy
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Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
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Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, United States of America
150
Laboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP, Lisboa, Portugal
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Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain
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Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
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Faculty of Mathematics and Physics, Charles University in Prague, Praha, Czech Republic
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Czech Technical University in Prague, Praha, Czech Republic
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State Research Center Institute for High Energy Physics, Protvino, Russia
156
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom
157
Physics Department, University of Regina, Regina, SK, Canada
158
Ritsumeikan University, Kusatsu, Shiga, Japan
159
INFN Sezione di Roma I, Roma, Italy
160
Dipartimento di Fisica, Università La Sapienza, Roma, Italy
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INFN Sezione di Roma Tor Vergata, Roma, Italy
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Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy
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INFN Sezione di Roma Tre, Roma, Italy
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Dipartimento di Fisica, Università Roma Tre, Roma, Italy
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Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies-Université Hassan II, Casablanca, Morocco
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Centre National de l’Energie des Sciences Techniques Nucleaires, Rabat, Morocco
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Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco
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Faculté des Sciences, Université Mohammed V, Rabat, Morocco
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DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers), CEA Saclay (Commissariat a l’Energie Atomique), Gif-sur-Yvette, France
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Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, United States of America
171
Department of Physics, University of Washington, Seattle, WA, United States of America
172
Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom
173
Department of Physics, Shinshu University, Nagano, Japan
174
Fachbereich Physik, Universität Siegen, Siegen, Germany
175
Department of Physics, Simon Fraser University, Burnaby, BC, Canada
176
SLAC National Accelerator Laboratory, Stanford, CA, United States of America
177
Faculty of Mathematics, Physics & Informatics, Comenius University, Bratislava, Slovak Republic
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Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
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Department of Physics, University of Johannesburg, Johannesburg, South Africa
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School of Physics, University of the Witwatersrand, Johannesburg, South Africa
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Department of Physics, Stockholm University, Stockholm, Sweden
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The Oskar Klein Centre, Stockholm, Sweden
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Physics Department, Royal Institute of Technology, Stockholm, Sweden
184
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, United States of America
185
Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom
186
School of Physics, University of Sydney, Sydney, Australia
187
Institute of Physics, Academia Sinica, Taipei, Taiwan
188
Technion: Israel Inst. of Technology, Haifa, Israel
189
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
190
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
191
International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan
192
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
193
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
194
Department of Physics, University of Toronto, Toronto, ON, Canada
195
TRIUMF, Vancouver, BC, Canada
196
Department of Physics and Astronomy, York University, Toronto, ON, Canada
197
Institute of Pure and Applied Sciences, University of Tsukuba, Ibaraki, Japan
198
Science and Technology Center, Tufts University, Medford, MA, United States of America
199
Centro de Investigaciones, Universidad Antonio Narino, Bogota, Colombia
200
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, United States of America
201
INFN Gruppo Collegato di Udine, Udine, Italy
202
ICTP, Trieste, Italy
203
Dipartimento di Fisica, Università di Udine, Udine, Italy
204
Department of Physics, University of Illinois, Urbana, IL, United States of America
205
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
206
Instituto de Física Corpuscular (IFIC) and Departamento de Física Atómica, Molecular y Nuclear and Departamento de Ingenierá Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, Spain
207
Department of Physics, University of British Columbia, Vancouver, BC, Canada
208
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
209
Waseda University, Tokyo, Japan
210
Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
211
Department of Physics, University of Wisconsin, Madison, WI, United States of America
212
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany
213
Fachbereich C Physik, Bergische Universität Wuppertal, Wuppertal, Germany
214
Department of Physics, Yale University, New Haven, CT, United States of America
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Yerevan Physics Institute, Yerevan, Armenia
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Domaine scientifique de la Doua, Centre de Calcul CNRS/IN2P3, Villeurbanne Cedex, France
* e-mail: atlas.publications@cern.ch
Received:
10
March
2011
Revised:
7
April
2011
Published online:
10
May
2011
We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters. Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV. Events were selected using a minimum-bias trigger which required a charged particle in scintillation counters on either side of the interaction point. Particle flows, sensitive to the underlying event, are measured using clusters of energy in the ATLAS calorimeters, taking advantage of their fine granularity. No Monte Carlo generator used in this analysis can accurately describe the measurements. The results are independent of those based on charged particles measured by the ATLAS tracking systems and can be used to constrain the parameters of Monte Carlo generators.
© Springer-Verlag / Società Italiana di Fisica, 2011
