https://doi.org/10.1140/epjc/s10052-013-2432-8
Regular Article - Experimental Physics
Measurement of k
T splitting scales in W→ℓν events at 
with the ATLAS detector
1
CERN, 1211, Geneva 23, Switzerland
2
School of Chemistry and Physics, University of Adelaide, Adelaide, Australia
3
Physics Department, SUNY Albany, Albany, NY, United States of America
4
Department of Physics, University of Alberta, Edmonton, AB, Canada
5
Department of Physics, Ankara University, Ankara, Turkey
6
Department of Physics, Dumlupinar University, Kutahya, Turkey
7
Department of Physics, Gazi University, Ankara, Turkey
8
Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
9
Turkish Atomic Energy Authority, Ankara, Turkey
10
LAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, France
11
High Energy Physics Division, Argonne National Laboratory, Argonne, IL, United States of America
12
Department of Physics, University of Arizona, Tucson, AZ, United States of America
13
Department of Physics, The University of Texas at Arlington, Arlington, TX, United States of America
14
Physics Department, University of Athens, Athens, Greece
15
Physics Department, National Technical University of Athens, Zografou, Greece
16
Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
17
Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona, and ICREA, Barcelona, Spain
18
Institute of Physics, University of Belgrade, Belgrade, Serbia
19
Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
20
Department for Physics and Technology, University of Bergen, Bergen, Norway
21
Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, United States of America
22
Department of Physics, Humboldt University, Berlin, Germany
23
Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
24
School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
25
Department of Physics, Bogazici University, Istanbul, Turkey
26
Division of Physics, Dogus University, Istanbul, Turkey
27
Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
28
Department of Physics, Istanbul Technical University, Istanbul, Turkey
29
INFN Sezione di Bologna, Bologna, Italy
30
Dipartimento di Fisica, Università di Bologna, Bologna, Italy
31
Physikalisches Institut, University of Bonn, Bonn, Germany
32
Department of Physics, Boston University, Boston, MA, United States of America
33
Department of Physics, Brandeis University, Waltham, MA, United States of America
34
Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
35
Federal University of Juiz de Fora (UFJF), Juiz de Fora, Brazil
36
Federal University of Sao Joao del Rei (UFSJ), Sao Joao del Rei, Brazil
37
Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, Brazil
38
Physics Department, Brookhaven National Laboratory, Upton, NY, United States of America
39
National Institute of Physics and Nuclear Engineering, Bucharest, Romania
40
University Politehnica Bucharest, Bucharest, Romania
41
West University in Timisoara, Timisoara, Romania
42
Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina
43
Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
44
Department of Physics, Carleton University, Ottawa, ON, Canada
45
CERN, Geneva, Switzerland
46
Enrico Fermi Institute, University of Chicago, Chicago, IL, United States of America
47
Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
48
Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile
49
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
50
Department of Modern Physics, University of Science and Technology of China, Anhui, China
51
Department of Physics, Nanjing University, Jiangsu, China
52
School of Physics, Shandong University, Shandong, China
53
Physics Department, Shanghai Jiao Tong University, Shanghai, China
54
Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Clermont-Ferrand, France
55
Nevis Laboratory, Columbia University, Irvington, NY, United States of America
56
Niels Bohr Institute, University of Copenhagen, Kobenhavn, Denmark
57
INFN Gruppo Collegato di Cosenza, Rende, Italy
58
Dipartimento di Fisica, Università della Calabria, Rende, Italy
59
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland
60
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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Physics Department, University of Texas at Dallas, Richardson, TX, United States of America
63
DESY, Hamburg and Zeuthen, Germany
64
Institut für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
65
Institut für Kern- und Teilchenphysik, Technical University Dresden, Dresden, Germany
66
Department of Physics, Duke University, Durham, NC, United States of America
67
SUPA - School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
68
INFN Laboratori Nazionali di Frascati, Frascati, Italy
69
Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany
70
Section de Physique, Université de Genève, Geneva, Switzerland
71
INFN Sezione di Genova, Genova, Italy
72
Dipartimento di Fisica, Università di Genova, Genova, Italy
73
E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
74
High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
75
II Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
76
SUPA - School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
77
II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany
78
Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier and CNRS/IN2P3 and Institut National Polytechnique de Grenoble, Grenoble, France
79
Department of Physics, Hampton University, Hampton, VA, United States of America
80
Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, United States of America
81
Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
82
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
83
ZITI Institut für technische Informatik, Ruprecht-Karls-Universität Heidelberg, Mannheim, Germany
84
Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan
85
Department of Physics, Indiana University, Bloomington, IN, United States of America
86
Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
87
University of Iowa, Iowa City, IA, United States of America
88
Department of Physics and Astronomy, Iowa State University, Ames, IA, United States of America
89
Joint Institute for Nuclear Research, JINR Dubna, Dubna, Russia
90
KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
91
Graduate School of Science, Kobe University, Kobe, Japan
92
Faculty of Science, Kyoto University, Kyoto, Japan
93
Kyoto University of Education, Kyoto, Japan
94
Department of Physics, Kyushu University, Fukuoka, Japan
95
Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
96
Physics Department, Lancaster University, Lancaster, United Kingdom
97
INFN Sezione di Lecce, Lecce, Italy
98
Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
99
Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
100
Department of Physics, Jožef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia
101
School of Physics and Astronomy, Queen Mary University of London, London, United Kingdom
102
Department of Physics, Royal Holloway University of London, Surrey, United Kingdom
103
Department of Physics and Astronomy, University College London, London, United Kingdom
104
Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France
105
Fysiska institutionen, Lunds universitet, Lund, Sweden
106
Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, Spain
107
Institut für Physik, Universität Mainz, Mainz, Germany
108
School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
109
CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France
110
Department of Physics, University of Massachusetts, Amherst, MA, United States of America
111
Department of Physics, McGill University, Montreal, QC, Canada
112
School of Physics, University of Melbourne, Victoria, Australia
113
Department of Physics, The University of Michigan, Ann Arbor, MI, United States of America
114
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, United States of America
115
INFN Sezione di Milano, Milano, Italy
116
Dipartimento di Fisica, Università di Milano, Milano, Italy
117
B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Republic of Belarus
118
National Scientific and Educational Centre for Particle and High Energy Physics, Minsk, Republic of Belarus
119
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, United States of America
120
Group of Particle Physics, University of Montreal, Montreal, QC, Canada
121
P.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, Russia
122
Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia
123
Moscow Engineering and Physics Institute (MEPhI), Moscow, Russia
124
D.V.Skobeltsyn Institute of Nuclear Physics, M.V.Lomonosov Moscow State University, Moscow, Russia
125
Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany
126
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany
127
Nagasaki Institute of Applied Science, Nagasaki, Japan
128
Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
129
INFN Sezione di Napoli, Napoli, Italy
130
Dipartimento di Scienze Fisiche, Università di Napoli, Napoli, Italy
131
Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, United States of America
132
Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands
133
Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands
134
Department of Physics, Northern Illinois University, DeKalb, IL, United States of America
135
Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
136
Department of Physics, New York University, New York, NY, United States of America
137
Ohio State University, Columbus, OH, United States of America
138
Faculty of Science, Okayama University, Okayama, Japan
139
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States of America
140
Department of Physics, Oklahoma State University, Stillwater, OK, United States of America
141
RCPTM, Palacký University, Olomouc, Czech Republic
142
Center for High Energy Physics, University of Oregon, Eugene, OR, United States of America
143
LAL, Université Paris-Sud and CNRS/IN2P3, Orsay, France
144
Graduate School of Science, Osaka University, Osaka, Japan
145
Department of Physics, University of Oslo, Oslo, Norway
146
Department of Physics, Oxford University, Oxford, United Kingdom
147
INFN Sezione di Pavia, Pavia, Italy
148
Dipartimento di Fisica, Università di Pavia, Pavia, Italy
149
Department of Physics, University of Pennsylvania, Philadelphia, PA, United States of America
150
Petersburg Nuclear Physics Institute, Gatchina, Russia
151
INFN Sezione di Pisa, Pisa, Italy
152
Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
153
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, United States of America
154
Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP, Lisboa, Portugal
155
Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain
156
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
157
Czech Technical University in Prague, Praha, Czech Republic
158
Faculty of Mathematics and Physics, Charles University in Prague, Praha, Czech Republic
159
State Research Center Institute for High Energy Physics, Protvino, Russia
160
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom
161
Physics Department, University of Regina, Regina, SK, Canada
162
Ritsumeikan University, Kusatsu, Shiga, Japan
163
INFN Sezione di Roma I, Roma, Italy
164
Dipartimento di Fisica, Università La Sapienza, Roma, Italy
165
INFN Sezione di Roma Tor Vergata, Roma, Italy
166
Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy
167
INFN Sezione di Roma Tre, Roma, Italy
168
Dipartimento di Matematica e Fisica, Università Roma Tre, Roma, Italy
169
Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies - Université Hassan II, Casablanca, Morocco
170
Centre National de l’Energie des Sciences Techniques Nucleaires, Rabat, Morocco
171
Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA, Marrakech, Morocco
172
Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco
173
Faculté des sciences, Université Mohammed V-Agdal, Rabat, Morocco
174
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
175
Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, United States of America
176
Department of Physics, University of Washington, Seattle, WA, United States of America
177
Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom
178
Department of Physics, Shinshu University, Nagano, Japan
179
Fachbereich Physik, Universität Siegen, Siegen, Germany
180
Department of Physics, Simon Fraser University, Burnaby, BC, Canada
181
SLAC National Accelerator Laboratory, Stanford, CA, United States of America
182
Faculty of Mathematics, Physics & Informatics, Comenius University, Bratislava, Slovak Republic
183
Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
184
Department of Physics, University of Johannesburg, Johannesburg, South Africa
185
School of Physics, University of the Witwatersrand, Johannesburg, South Africa
186
Department of Physics, Stockholm University, Stockholm, Sweden
187
The Oskar Klein Centre, Stockholm, Sweden
188
Physics Department, Royal Institute of Technology, Stockholm, Sweden
189
Departments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook, NY, United States of America
190
Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom
191
School of Physics, University of Sydney, Sydney, Australia
192
Institute of Physics, Academia Sinica, Taipei, Taiwan
193
Department of Physics, Technion: Israel Institute of Technology, Haifa, Israel
194
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
195
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
196
International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan
197
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
198
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
199
Department of Physics, University of Toronto, Toronto, ON, Canada
200
TRIUMF, Vancouver, BC, Canada
201
Department of Physics and Astronomy, York University, Toronto, ON, Canada
202
Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
203
Department of Physics and Astronomy, Tufts University, Medford, MA, United States of America
204
Centro de Investigaciones, Universidad Antonio Narino, Bogota, Colombia
205
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, United States of America
206
INFN Gruppo Collegato di Udine, Udine, Italy
207
ICTP, Trieste, Italy
208
Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, Italy
209
Department of Physics, University of Illinois, Urbana, IL, United States of America
210
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
211
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
212
Department of Physics, University of British Columbia, Vancouver, BC, Canada
213
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
214
Department of Physics, University of Warwick, Coventry, United Kingdom
215
Waseda University, Tokyo, Japan
216
Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
217
Department of Physics, University of Wisconsin, Madison, WI, United States of America
218
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany
219
Fachbereich C Physik, Bergische Universität Wuppertal, Wuppertal, Germany
220
Department of Physics, Yale University, New Haven, CT, United States of America
221
Yerevan Physics Institute, Yerevan, Armenia
222
Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France
* e-mail: atlas.publications@cern.ch
Received:
6
February
2013
Revised:
18
March
2013
Published online:
15
May
2013
A measurement of splitting scales, as defined by the k T clustering algorithm, is presented for final states containing a W boson produced in proton–proton collisions at a centre-of-mass energy of 7 TeV. The measurement is based on the full 2010 data sample corresponding to an integrated luminosity of 36 pb−1 which was collected using the ATLAS detector at the CERN Large Hadron Collider. Cluster splitting scales are measured in events containing W bosons decaying to electrons or muons. The measurement comprises the four hardest splitting scales in a k T cluster sequence of the hadronic activity accompanying the W boson, and ratios of these splitting scales. Backgrounds such as multi-jet and top-quark-pair production are subtracted and the results are corrected for detector effects. Predictions from various Monte Carlo event generators at particle level are compared to the data. Overall, reasonable agreement is found with all generators, but larger deviations between the predictions and the data are evident in the soft regions of the splitting scales.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2013
