https://doi.org/10.1140/epjc/s10052-016-4176-8
Regular Article - Experimental Physics
Measurement of event-shape observables in
events in pp collisions at
with the ATLAS detector at the LHC
1
Department of Physics, University of Adelaide, Adelaide, Australia
2
Physics Department, SUNY Albany, Albany, NY, USA
3
Department of Physics, University of Alberta, Edmonton, AB, Canada
4
Department of Physics, Ankara University, Ankara, Turkey
5
Istanbul Aydin University, Istanbul, Turkey
6
Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
7
LAPP, CNRS/IN2P3 and Université Savoie Mont Blanc, Annecy-le-Vieux, France
8
High Energy Physics Division, Argonne National Laboratory, Argonne, IL, USA
9
Department of Physics, University of Arizona, Tucson, AZ, USA
10
Department of Physics, The University of Texas at Arlington, Arlington, TX, USA
11
Physics Department, University of Athens, Athens, Greece
12
Physics Department, National Technical University of Athens, Zografou, Greece
13
Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
14
Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Barcelona, Spain
15
Institute of Physics, University of Belgrade, Belgrade, Serbia
16
Department for Physics and Technology, University of Bergen, Bergen, Norway
17
Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, USA
18
Department of Physics, Humboldt University, Berlin, Germany
19
Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
20
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
21
Department of Physics, Bogazici University, Istanbul, Turkey
22
Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
23
Faculty of Engineering and Natural Sciences, Istanbul Bilgi University, Istanbul, Turkey
24
Faculty of Engineering and Natural Sciences, Bahcesehir University, Istanbul, Turkey
25
Centro de Investigaciones, Universidad Antonio Narino, Bogotá, Colombia
26
INFN Sezione di Bologna, Bologna, Italy
27
Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
28
Physikalisches Institut, University of Bonn, Bonn, Germany
29
Department of Physics, Boston University, Boston, MA, USA
30
Department of Physics, Brandeis University, Waltham, MA, USA
31
Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
32
Electrical Circuits Department, Federal University of Juiz de Fora (UFJF), Juiz de Fora, Brazil
33
Federal University of Sao Joao del Rei (UFSJ), Sao Joao del Rei, Brazil
34
Instituto de Fisica, Universidade de Sao Paulo, São Paulo, Brazil
35
Physics Department, Brookhaven National Laboratory, Upton, NY, USA
36
Transilvania University of Brasov, Brasov, Romania
37
National Institute of Physics and Nuclear Engineering, Bucharest, Romania
38
Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj Napoca, Romania
39
University Politehnica Bucharest, Bucharest, Romania
40
West University in Timisoara, Timisoara, Romania
41
Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina
42
Cavendish Laboratory, University of Cambridge, Cambridge, UK
43
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, USA
46
Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
47
Departamento de Física, Universidad Técnica Federico Santa María, Valparaiso, Chile
48
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
49
Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, China
50
Department of Physics, Nanjing University, Nanjing, Jiangsu, China
51
School of Physics, Shandong University, Jinan, Shandong, China
52
Shanghai Key Laboratory for Particle Physics and Cosmology, Department of Physics and Astronomy, Shanghai Jiao Tong University, (also affiliated with PKU-CHEP), Shanghai, China
53
Physics Department, Tsinghua University, Beijing, 100084, China
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Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Clermont-Ferrand, France
55
Nevis Laboratory, Columbia University, Irvington, NY, USA
56
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
57
INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
58
Dipartimento di Fisica, Università della Calabria, Rende, Italy
59
Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland
60
Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
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Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
62
Physics Department, Southern Methodist University, Dallas, TX, USA
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Physics Department, University of Texas at Dallas, Richardson, TX, USA
64
DESY, Hamburg and Zeuthen, Germany
65
Institut für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
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Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
67
Department of Physics, Duke University, Durham, NC, USA
68
SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
69
INFN Laboratori Nazionali di Frascati, Frascati, Italy
70
Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany
71
Section de Physique, Université de Genève, Geneva, Switzerland
72
INFN Sezione di Genova, Genoa, Italy
73
Dipartimento di Fisica, Università di Genova, Genoa, Italy
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E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
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High Energy Physics Institute, 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, UK
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II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany
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Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble, France
80
Department of Physics, Hampton University, Hampton, VA, USA
81
Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, USA
82
Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
83
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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ZITI Institut für technische Informatik, Ruprecht-Karls-Universität Heidelberg, Mannheim, Germany
85
Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan
86
Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
87
Department of Physics, The University of Hong Kong, Hong Kong, China
88
Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
89
Department of Physics, Indiana University, Bloomington, IN, USA
90
Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
91
University of Iowa, Iowa City, IA, USA
92
Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
93
Joint Institute for Nuclear Research, JINR Dubna, Dubna, Russia
94
KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
95
Graduate School of Science, Kobe University, Kobe, Japan
96
Faculty of Science, Kyoto University, Kyoto, Japan
97
Kyoto University of Education, Kyoto, Japan
98
Department of Physics, Kyushu University, Fukuoka, Japan
99
Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
100
Physics Department, Lancaster University, Lancaster, UK
101
INFN Sezione di Lecce, Lecce, Italy
102
Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
103
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
104
Department of Physics, Jožef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia
105
School of Physics and Astronomy, Queen Mary University of London, London, UK
106
Department of Physics, Royal Holloway University of London, Surrey, UK
107
Department of Physics and Astronomy, University College London, London, UK
108
Louisiana Tech University, Ruston, LA, USA
109
Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France
110
Fysiska institutionen, Lunds universitet, Lund, Sweden
111
Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, Spain
112
Institut für Physik, Universität Mainz, Mainz, Germany
113
School of Physics and Astronomy, University of Manchester, Manchester, UK
114
CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France
115
Department of Physics, University of Massachusetts, Amherst, MA, USA
116
Department of Physics, McGill University, Montreal, QC, Canada
117
School of Physics, University of Melbourne, Melbourne, VIC, Australia
118
Department of Physics, The University of Michigan, Ann Arbor, MI, USA
119
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
120
INFN Sezione di Milano, Milan, Italy
121
Dipartimento di Fisica, Università di Milano, Milan, Italy
122
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
124
Group of Particle Physics, University of Montreal, Montreal, QC, Canada
125
P.N. Lebedev Physical Institute of the Russian, Academy of Sciences, Moscow, Russia
126
Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia
127
National Research Nuclear University MEPhI, Moscow, Russia
128
D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
129
Fakultät für Physik, Ludwig-Maximilians-Universität München, Munich, Germany
130
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Munich, Germany
131
Nagasaki Institute of Applied Science, Nagasaki, Japan
132
Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
133
INFN Sezione di Napoli, Naples, Italy
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Dipartimento di Fisica, Università di Napoli, Naples, Italy
135
Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
136
Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, The Netherlands
137
Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, The Netherlands
138
Department of Physics, Northern Illinois University, DeKalb, IL, USA
139
Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
140
Department of Physics, New York University, New York, NY, USA
141
Ohio State University, Columbus, OH, USA
142
Faculty of Science, Okayama University, Okayama, Japan
143
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
144
Department of Physics, Oklahoma State University, Stillwater, OK, USA
145
Palacký University, RCPTM, Olomouc, Czech Republic
146
Center for High Energy Physics, University of Oregon, Eugene, OR, USA
147
LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris Saclay, Orsay, France
148
Graduate School of Science, Osaka University, Osaka, Japan
149
Department of Physics, University of Oslo, Oslo, Norway
150
Department of Physics, Oxford University, Oxford, UK
151
INFN Sezione di Pavia, Pavia, Italy
152
Dipartimento di Fisica, Università di Pavia, Pavia, Italy
153
Department of Physics, University of Pennsylvania, Philadelphia, PA, USA
154
National Research Centre “Kurchatov Institute” B.P.Konstantinov Petersburg Nuclear Physics Institute, St. Petersburg, Russia
155
INFN Sezione di Pisa, Pisa, Italy
156
Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
157
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, USA
158
Laboratório de Instrumentação e Física Experimental de Partículas-LIP, Lisbon, Portugal
159
Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
160
Department of Physics, University of Coimbra, Coimbra, Portugal
161
Centro de Física Nuclear da Universidade de Lisboa, Lisbon, Portugal
162
Departamento de Fisica, Universidade do Minho, Braga, Portugal
163
Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain
164
Dep Fisica and CEFITEC of Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
165
Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
166
Czech Technical University in Prague, Prague, Czech Republic
167
Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic
168
State Research Center Institute for High Energy Physics (Protvino), NRC KI, Protvino, Russia
169
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
170
INFN Sezione di Roma, Rome, Italy
171
Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
172
INFN Sezione di Roma Tor Vergata, Rome, Italy
173
Dipartimento di Fisica, Università di Roma Tor Vergata, Rome, Italy
174
INFN Sezione di Roma Tre, Rome, Italy
175
Dipartimento di Matematica e Fisica, Università Roma Tre, Rome, Italy
176
Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies-Université Hassan II, Casablanca, Morocco
177
Centre National de l’Energie des Sciences Techniques Nucleaires, Rabat, Morocco
178
Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Marrakech, Morocco
179
Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco
180
Faculté des Sciences, Université Mohammed V, Rabat, Morocco
181
DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers), CEA Saclay (Commissariat à l’Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, France
182
Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, USA
183
Department of Physics, University of Washington, Seattle, WA, USA
184
Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
185
Department of Physics, Shinshu University, Nagano, Japan
186
Fachbereich Physik, Universität Siegen, Siegen, Germany
187
Department of Physics, Simon Fraser University, Burnaby, BC, Canada
188
SLAC National Accelerator Laboratory, Stanford, CA, USA
189
Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak Republic
190
Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
191
Department of Physics, University of Cape Town, Cape Town, South Africa
192
Department of Physics, University of Johannesburg, Johannesburg, South Africa
193
School of Physics, University of the Witwatersrand, Johannesburg, South Africa
194
Department of Physics, Stockholm University, Stockholm, Sweden
195
The Oskar Klein Centre, Stockholm, Sweden
196
Physics Department, Royal Institute of Technology, Stockholm, Sweden
197
Departments of Physics and Astronomy and Chemistry, Stony Brook University, Stony Brook, NY, USA
198
Department of Physics and Astronomy, University of Sussex, Brighton, UK
199
School of Physics, University of Sydney, Sydney, Australia
200
Institute of Physics, Academia Sinica, Taipei, Taiwan
201
Department of Physics, Technion: Israel Institute of Technology, Haifa, Israel
202
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
203
Department of Physics, Aristotle University of Thessaloniki, Thessaloníki, Greece
204
International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan
205
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
206
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
207
Department of Physics, University of Toronto, Toronto, ON, Canada
208
TRIUMF, Vancouver, BC, Canada
209
Department of Physics and Astronomy, York University, Toronto, ON, Canada
210
Faculty of Pure and Applied Sciences, and Center for Integrated Research in Fundamental Science and Engineering, University of Tsukuba, Tsukuba, Japan
211
Department of Physics and Astronomy, Tufts University, Medford, MA, USA
212
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
213
INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
214
ICTP, Trieste, Italy
215
Dipartimento di Chimica Fisica e Ambiente, Università di Udine, Udine, Italy
216
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
217
Department of Physics, University of Illinois, Urbana, IL, USA
218
Instituto de Física Corpuscular (IFIC) and Departamento de Física Atómica, Molecular y Nuclear and Departamento de Ingeniería Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, Spain
219
Department of Physics, University of British Columbia, Vancouver, BC, Canada
220
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
221
Department of Physics, University of Warwick, Coventry, UK
222
Waseda University, Tokyo, Japan
223
Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
224
Department of Physics, University of Wisconsin, Madison, WI, USA
225
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany
226
Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
227
Department of Physics, Yale University, New Haven, CT, USA
228
Yerevan Physics Institute, Yerevan, Armenia
229
Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France
230
CERN, Geneva, Switzerland
* e-mail: atlas.publications@cern.ch
Received:
1
March
2016
Accepted:
2
June
2016
Published online:
6
July
2016
Event-shape observables measured using charged particles in inclusive Z-boson events are presented, using the electron and muon decay modes of the Z bosons. The measurements are based on an integrated luminosity of of proton–proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy
. Charged-particle distributions, excluding the lepton–antilepton pair from the Z-boson decay, are measured in different ranges of transverse momentum of the Z boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and
-parameter, which are in particular sensitive to properties of the underlying event at small values of the Z-boson transverse momentum. The measured observables are compared with predictions from Pythia 8, Sherpa, and Herwig 7. Typically, all three Monte Carlo generators provide predictions that are in better agreement with the data at high Z-boson transverse momenta than at low Z-boson transverse momenta, and for the observables that are less sensitive to the number of charged particles in the event.
© CERN for the benefit of the ATLAS collaboration, 2016