https://doi.org/10.1140/epjc/s10052-021-09843-w
Regular Article - Experimental Physics
Measurement of the c-jet mistagging efficiency in 
events using pp collision data at 
collected with the ATLAS detector
1
Department of Physics, University of Adelaide, Adelaide, Australia
2
Department of Physics, University of Alberta, Edmonton, AB, Canada
3
Department of Physics, Ankara University, Ankara, Turkey
4
Application and Research Center for Advanced Studies, Istanbul Aydin University, Istanbul, Turkey
5
Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
6
LAPP, Univ. Savoie Mont Blanc, CNRS/IN2P3, Annecy, France
7
High Energy Physics Division, Argonne National Laboratory, Argonne, IL, USA
8
Department of Physics, University of Arizona, Tucson, AZ, USA
9
Department of Physics, University of Texas at Arlington, Arlington, TX, USA
10
Physics Department, National and Kapodistrian University of Athens, Athens, Greece
11
Physics Department, National Technical University of Athens, Zografou, Greece
12
Department of Physics, University of Texas at Austin, Austin, TX, USA
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Faculty of Engineering and Natural Sciences, Bahcesehir University, Istanbul, Turkey
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Faculty of Engineering and Natural Sciences, Istanbul Bilgi University, Istanbul, Turkey
15
Department of Physics, Bogazici University, Istanbul, Turkey
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Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
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Department of Physics, Istanbul University, Istanbul, Turkey
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Istinye University, Sariyer, Istanbul, Turkey
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Institut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain
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Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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Physics Department, Tsinghua University, Beijing, China
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Department of Physics, Nanjing University, Nanjing, China
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University of Chinese Academy of Science (UCAS), Beijing, China
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Institute of Physics, University of Belgrade, Belgrade, Serbia
25
Department for Physics and Technology, University of Bergen, Bergen, Norway
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Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, USA
27
Institut für Physik, Humboldt Universität zu Berlin, Berlin, Germany
28
Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
29
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
30
Facultad de Ciencias y Centro de Investigaciónes, Universidad Antonio Nariño, Bogotá, Colombia
31
Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
32
Dipartimento di Fisica e Astronomia A. Righi, Università di Bologna, Bologna, Italy
33
INFN Sezione di Bologna, Bologna, Italy
34
Physikalisches Institut, Universität Bonn, Bonn, Germany
35
Department of Physics, Boston University, Boston, MA, USA
36
Department of Physics, Brandeis University, Waltham, MA, USA
37
Transilvania University of Brasov, Brasov, Romania
38
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
39
Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
40
Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
41
University Politehnica Bucharest, Bucharest, Romania
42
West University in Timisoara, Timisoara, Romania
43
Faculty of Mathematics, Physics and 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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Physics Department, Brookhaven National Laboratory, Upton, NY, USA
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Departamento de Física (FCEN) and IFIBA, Universidad de Buenos Aires and CONICET, Buenos Aires, Argentina
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California State University, Long Beach, CA, USA
48
Cavendish Laboratory, University of Cambridge, Cambridge, UK
49
Department of Physics, University of Cape Town, Cape Town, South Africa
50
iThemba Labs, Cape Town, Western Cape, South Africa
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Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
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National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
53
University of South Africa, Department of Physics, Pretoria, South Africa
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University of Zululand, KwaDlangezwa, South Africa
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School of Physics, University of the Witwatersrand, Johannesburg, South Africa
56
Department of Physics, Carleton University, Ottawa, ON, Canada
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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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Faculté des Sciences, Université Ibn-Tofail, Kenitra, Morocco
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Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Marrakech, Morocco
60
LPMR, Faculté des Sciences, Université Mohamed Premier, Oujda, Morocco
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Faculté des Sciences, Université Mohammed V, Rabat, Morocco
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Mohammed VI Polytechnic University, Ben Guerir, Morocco
63
CERN, Geneva, Switzerland
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Enrico Fermi Institute, University of Chicago, Chicago, IL, USA
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LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, France
66
Nevis Laboratory, Columbia University, Irvington, NY, USA
67
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
68
Dipartimento di Fisica, Università della Calabria, Rende, Italy
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INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
70
Physics Department, Southern Methodist University, Dallas, TX, USA
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Physics Department, University of Texas at Dallas, Richardson, TX, USA
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National Centre for Scientific Research “Demokritos”, Agia Paraskevi, Greece
73
Department of Physics, Stockholm University, Stockholm, Sweden
74
Oskar Klein Centre, Stockholm, Sweden
75
Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany
76
Lehrstuhl für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
77
Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
78
Department of Physics, Duke University, Durham, NC, USA
79
SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
80
INFN e Laboratori Nazionali di Frascati, Frascati, Italy
81
Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
82
II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
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Département de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland
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Dipartimento di Fisica, Università di Genova, Genoa, Italy
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INFN Sezione di Genova, Genoa, Italy
86
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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LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, France
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Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, USA
90
Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
91
Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao, China
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Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
93
Tsung-Dao Lee Institute, Shanghai, China
94
Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
95
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
96
Department of Physics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
97
Department of Physics, University of Hong Kong, Hong Kong, China
98
Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
99
Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
100
IJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405, Orsay, France
101
Department of Physics, Indiana University, Bloomington, IN, USA
102
INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
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ICTP, Trieste, Italy
104
Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine, Udine, Italy
105
INFN Sezione di Lecce, Lecce, Italy
106
Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
107
INFN Sezione di Milano, Milan, Italy
108
Dipartimento di Fisica, Università di Milano, Milan, Italy
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INFN Sezione di Napoli, Naples, Italy
110
Dipartimento di Fisica, Università di Napoli, Naples, Italy
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INFN Sezione di Pavia, Pavia, Italy
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Dipartimento di Fisica, Università di Pavia, Pavia, Italy
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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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INFN Sezione di Roma, Rome, Italy
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Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
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INFN Sezione di Roma Tor Vergata, Rome, Italy
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Dipartimento di Fisica, Università di Roma Tor Vergata, Rome, Italy
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INFN Sezione di Roma Tre, Rome, Italy
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Dipartimento di Matematica e Fisica, Università Roma Tre, Rome, Italy
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INFN-TIFPA, Povo, Italy
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Università degli Studi di Trento, Trento, Italy
123
Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
124
University of Iowa, Iowa City, IA, USA
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Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
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Joint Institute for Nuclear Research, Dubna, Russia
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Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, Brazil
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Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
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Instituto de Física, Universidade de São Paulo, São Paulo, Brazil
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Rio de Janeiro State University, Rio de Janeiro, Brazil
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KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
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Graduate School of Science, Kobe University, Kobe, Japan
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Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland
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Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
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Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
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Faculty of Science, Kyoto University, Kyoto, Japan
137
Kyoto University of Education, Kyoto, Japan
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Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka, Japan
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Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
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Physics Department, Lancaster University, Lancaster, UK
141
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
142
Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, Slovenia
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School of Physics and Astronomy, Queen Mary University of London, London, UK
144
Department of Physics, Royal Holloway University of London, Egham, UK
145
Department of Physics and Astronomy, University College London, London, UK
146
Louisiana Tech University, Ruston, LA, USA
147
Fysiska institutionen, Lunds universitet, Lund, Sweden
148
Departamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, Spain
149
Institut für Physik, Universität Mainz, Mainz, Germany
150
School of Physics and Astronomy, University of Manchester, Manchester, UK
151
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
152
Department of Physics, University of Massachusetts, Amherst, MA, USA
153
Department of Physics, McGill University, Montreal, QC, Canada
154
School of Physics, University of Melbourne, Melbourne, VIC, Australia
155
Department of Physics, University of Michigan, Ann Arbor, MI, USA
156
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
157
B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus
158
Research Institute for Nuclear Problems of Byelorussian State University, Minsk, Belarus
159
Group of Particle Physics, University of Montreal, Montreal, QC, Canada
160
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
161
National Research Nuclear University MEPhI, Moscow, Russia
162
D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
163
Fakultät für Physik, Ludwig-Maximilians-Universität München, Munich, Germany
164
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Munich, Germany
165
Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
166
Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
167
Institute for Mathematics, Astrophysics and Particle Physics, Radboud University/Nikhef, Nijmegen, The Netherlands
168
Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, The Netherlands
169
Department of Physics, Northern Illinois University, DeKalb, IL, USA
170
Budker Institute of Nuclear Physics and NSU, SB RAS, Novosibirsk, Russia
171
Novosibirsk State University, Novosibirsk, Russia
172
Institute for High Energy Physics of the National Research Centre Kurchatov Institute, Protvino, Russia
173
Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of National Research Centre “Kurchatov Institute”, Moscow, Russia
174
Department of Physics, New York University, New York, NY, USA
175
Ochanomizu University, Otsuka, Bunkyo-ku, Tokyo, Japan
176
Ohio State University, Columbus, OH, USA
177
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
178
Department of Physics, Oklahoma State University, Stillwater, OK, USA
179
Joint Laboratory of Optics, Palacký University, Olomouc, Czech Republic
180
Institute for Fundamental Science, University of Oregon, Eugene, OR, USA
181
Graduate School of Science, Osaka University, Osaka, Japan
182
Department of Physics, University of Oslo, Oslo, Norway
183
Department of Physics, Oxford University, Oxford, UK
184
LPNHE, Sorbonne Université, Université de Paris, CNRS/IN2P3, Paris, France
185
Department of Physics, University of Pennsylvania, Philadelphia, PA, USA
186
Konstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”, PNPI, St. Petersburg, Russia
187
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, USA
188
Laboratório de Instrumentação e Física Experimental de Partículas-LIP, Lisbon, Portugal
189
Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
190
Departamento de Física, Universidade de Coimbra, Coimbra, Portugal
191
Centro de Física Nuclear da Universidade de Lisboa, Lisbon, Portugal
192
Departamento de Física, Universidade do Minho, Braga, Portugal
193
Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, Spain
194
Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
195
Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
196
Czech Technical University in Prague, Prague, Czech Republic
197
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
198
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
199
IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
200
Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, USA
201
Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
202
Millennium Institute for Subatomic Physics at High Energy Frontier (SAPHIR), Santiago, Chile
203
Universidad de la Serena, La Serena, Chile
204
Department of Physics, Universidad Andres Bello, Santiago, Chile
205
Instituto de Alta Investigación, Universidad de Tarapacá, Arica, Chile
206
Departamento de Física, Universidad Técnica Federico Santa María, Valparaiso, Chile
207
Universidade Federal de São João del Rei (UFSJ), São João del Rei, Brazil
208
Department of Physics, University of Washington, Seattle, WA, USA
209
Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
210
Department of Physics, Shinshu University, Nagano, Japan
211
Department Physik, Universität Siegen, Siegen, Germany
212
Department of Physics, Simon Fraser University, Burnaby, BC, Canada
213
SLAC National Accelerator Laboratory, Stanford, CA, USA
214
Department of Physics, Royal Institute of Technology, Stockholm, Sweden
215
Departments of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA
216
Department of Physics and Astronomy, University of Sussex, Brighton, UK
217
School of Physics, University of Sydney, Sydney, Australia
218
Institute of Physics, Academia Sinica, Taipei, Taiwan
219
E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
220
High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
221
Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel
222
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
223
Department of Physics, Aristotle University of Thessaloniki, Thessaloníki, Greece
224
International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan
225
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
226
Tomsk State University, Tomsk, Russia
227
Department of Physics, University of Toronto, Toronto, ON, Canada
228
TRIUMF, Vancouver, BC, Canada
229
Department of Physics and Astronomy, York University, Toronto, ON, Canada
230
Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
231
Department of Physics and Astronomy, Tufts University, Medford, MA, USA
232
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
233
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
234
Department of Physics, University of Illinois, Urbana, IL, USA
235
Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
236
Department of Physics, University of British Columbia, Vancouver, BC, Canada
237
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
238
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany
239
Department of Physics, University of Warwick, Coventry, UK
240
Waseda University, Tokyo, Japan
241
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel
242
Department of Physics, University of Wisconsin, Madison, WI, USA
243
Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
244
Department of Physics, Yale University, New Haven, CT, USA
245
Borough of Manhattan Community College, City University of New York, New York, NY, USA
246
Bruno Kessler Foundation, Trento, Italy
247
Center for High Energy Physics, Peking University, Beijing, China
248
Centro Studi e Ricerche Enrico Fermi, Rome, Italy
249
CERN, Geneva, Switzerland
250
Département de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland
251
Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain
252
Department of Financial and Management Engineering, University of the Aegean, Chios, Greece
253
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
254
Department of Physics and Astronomy, University of Louisville, Louisville, KY, USA
255
Department of Physics, Ben Gurion University of the Negev, Beersheba, Israel
256
Department of Physics, California State University, East Bay, USA
257
Department of Physics, California State University, Fresno, USA
258
Department of Physics, California State University, Sacramento, USA
259
Department of Physics, King’s College London, London, UK
260
Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg, Russia
261
Department of Physics, University of Fribourg, Fribourg, Switzerland
262
Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
263
Faculty of Physics, Sofia University, ‘St. Kliment Ohridski’, Sofia, Bulgaria
264
Graduate School of Science, Osaka University, Osaka, Japan
265
Hellenic Open University, Patras, Greece
266
Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain
267
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
268
Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary
269
Institute of Particle Physics (IPP), Victoria, Canada
270
Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
271
Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia
272
Instituto de Fisica Teorica, IFT-UAM/CSIC, Madrid, Spain
273
Department of Physics, Istanbul University, Istanbul, Turkey
274
Joint Institute for Nuclear Research, Dubna, Russia
275
Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia
276
National Research Nuclear University MEPhI, Moscow, Russia
277
Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
278
The City College of New York, New York, NY, USA
279
TRIUMF, Vancouver, BC, Canada
280
Universita di Napoli Parthenope, Naples, Italy
281
University of Chinese Academy of Sciences (UCAS), Beijing, China
282
Physics Department, Yeditepe University, Istanbul, Turkey
283
CERN, 1211, Geneva 23, Switzerland
u
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Received:
23
September
2021
Accepted:
17
November
2021
Published online:
31
January
2022
A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using events, where one of the W bosons decays into an electron or muon and a neutrino and the other decays into a quark–antiquark pair. The measurement utilises the relatively large and known 
branching ratio, which allows a measurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at 
and corresponds to an integrated luminosity of 139 fb
. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3–17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirement.
© The Author(s) 2022
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