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Abstract
An invariant differential cross section measurement of inclusive and meson production at mid-rapidity in pp collisions at TeV was carried out by the ALICE experiment at the LHC. The spectra of and mesons were measured in transverse momentum ranges of and , respectively. Next-to-leading order perturbative QCD calculations using fragmentation functions DSS14 for the and AESSS for the overestimate the cross sections of both neutral mesons, although such calculations agree with the measured ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the ratio seen for NA27, PHENIX and ALICE data for pp collisions from GeV to TeV within experimental uncertainties. A relation between the and production cross sections for pp collisions at TeV is given by scaling for . However, a deviation from this empirical scaling rule is observed for transverse momenta below in the ratio with a significance of .
Details
1 Variable Energy Cyclotron Centre, Kolkata, India
2 Physics Department, Creighton University, Omaha, NE, USA
3 Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řežu Prahy, Czech Republic
4 Division of Experimental High Energy Physics, University of Lund, Lund, Sweden
5 Physics Department, Panjab University, Chandigarh, India
6 European Organization for Nuclear Research (CERN), Geneva, Switzerland
7 Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy
8 Indian Institute of Technology Bombay (IIT), Mumbai, India
9 Department of Physics, Aligarh Muslim University, Aligarh, India
10 Korea Institute of Science and Technology Information, Daejeon, Republic of Korea
11 Yale University, New Haven, CT, USA
12 Institute for Theoretical and Experimental Physics, Moscow, Russia
13 Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
14 Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru
15 Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
16 National Research Centre Kurchatov Institute, Moscow, Russia
17 INFN, Sezione di Torino, Turin, Italy
18 Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
19 Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi’, Rome, Italy; Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy; INFN, Sezione di Bologna, Bologna, Italy
20 Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine
21 Department of Physics and Technology, University of Bergen, Bergen, Norway
22 Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
23 V. Fock Institute for Physics, St. Petersburg State University, St. Petersburg, Russia
24 Universidade de São Paulo (USP), São Paulo, Brazil
25 National Institute for Physics and Nuclear Engineering, Bucharest, Romania
26 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
27 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
28 Rudjer Bošković Institute, Zagreb, Croatia
29 INFN, Sezione di Padova, Padua, Italy
30 INFN, Sezione di Bologna, Bologna, Italy
31 University of Houston, Houston, TX, USA
32 SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, France
33 Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy
34 Excellence Cluster Universe, Technische Universität München, Munich, Germany; Physik Department, Technische Universität München, Munich, Germany
35 Department of Physics, University of Oslo, Oslo, Norway
36 INFN, Sezione di Catania, Catania, Italy
37 Inha University, Incheon, Republic of Korea; Konkuk University, Seoul, Republic of Korea
38 Physics Department, University of Jammu, Jammu, India
39 IRFU, CEA, Université Paris-Saclay, Saclay, France
40 Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
41 Institute of Physics, Bhubaneswar, India; National Institute of Science Education and Research, HBNI, Jatni, India
42 Dipartimento di Fisica dell’Università and Sezione INFN, Turin, Italy
43 Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, Italy
44 Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy; INFN, Sezione di Bari, Bari, Italy
45 Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
46 Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, UK
47 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
48 Central China Normal University, Wuhan, China
49 Wayne State University, Detroit, MI, USA
50 Joint Institute for Nuclear Research (JINR), Dubna, Russia
51 Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
52 Institute for Subatomic Physics of Utrecht University, Utrecht, The Netherlands
53 Inha University, Incheon, Republic of Korea
54 Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
55 Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
56 Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
57 Universidad Autónoma de Sinaloa, Culiacán, Mexico
58 Moscow Engineering Physics Institute, Moscow, Russia
59 Petersburg Nuclear Physics Institute, Gatchina, Russia
60 University of Tennessee, Knoxville, TN, USA
61 Department of Physics, Gauhati University, Guwahati, India
62 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
63 INFN, Laboratori Nazionali di Frascati, Frascati, Italy
64 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
65 Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Bose Institute, Kolkata, India
66 Physics Department, The University of Texas at Austin, Austin, TX, USA
67 Università degli Studi di Pavia, Pavia, Italy
68 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
69 Faculty of Science, P.J. Šafárik University, Kosice, Slovakia
70 Università di Brescia, Brescia, Italy
71 Department of Physics, Pusan National University, Pusan, Republic of Korea; Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
72 University of Liverpool, Liverpool, UK
73 Helsinki Institute of Physics (HIP), Helsinki, Finland
74 Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
75 Russian Federal Nuclear Center (VNIIEF), Sarov, Russia
76 Stefan Meyer Institut für Subatomare Physik (SMI), Vienna, Austria
77 University of Tsukuba, Tsukuba, Japan
78 iThemba LABS, National Research Foundation, Somerset West, South Africa
79 COMSATS Institute of Information Technology (CIIT), Islamabad, Pakistan
80 Department of Physics, Ohio State University, Columbus, OH, USA
81 Technical University of Košice, Kosice, Slovakia
82 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Nikhef, Nationaal instituut voor subatomaire fysica, Amsterdam, The Netherlands
83 Institute for Subatomic Physics of Utrecht University, Utrecht, The Netherlands; Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
84 Dipartimento di Fisica dell’Università and Sezione INFN, Trieste, Italy
85 Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi’, Rome, Italy; Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy
86 INFN, Sezione di Cagliari, Cagliari, Italy
87 Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba
88 University of Jyväskylä, Jyväskylä, Finland
89 Université de Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, Lyon, France
90 Nikhef, Nationaal instituut voor subatomaire fysica, Amsterdam, The Netherlands
91 Department of Physics, Pusan National University, Pusan, Republic of Korea
92 Physics Department, University of Cape Town, Cape Town, South Africa
93 Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy
94 European Organization for Nuclear Research (CERN), Geneva, Switzerland; INFN, Sezione di Bari, Bari, Italy; Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
95 Lawrence Berkeley National Laboratory, Berkeley, CA, USA
96 Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France
97 Institut de Physique Nucléaire d’Orsay (IPNO), Université Paris-Sud, CNRS-IN2P3, Orsay, France
98 Oak Ridge National Laboratory, Oak Ridge, TN, USA
99 Dipartimento di Scienze e Innovazione Tecnologica dell’Università del Piemonte Orientale and INFN Sezione di Torino, Alessandria, Italy
100 Universidade Federal do ABC, Santo Andre, Brazil
101 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico
102 Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
103 Institute of Space Science (ISS), Bucharest, Romania
104 Saha Institute of Nuclear Physics, Kolkata, India
105 National Institute of Science Education and Research, HBNI, Jatni, India
106 Indian Institute of Technology Indore, Indore, India; Universidade de São Paulo (USP), São Paulo, Brazil
107 Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy
108 INFN, Sezione di Bari, Bari, Italy
109 Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
110 Dipartimento di Fisica dell’Università and Sezione INFN, Cagliari, Italy
111 Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi’, Rome, Italy; Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy
112 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany; Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
113 National Centre for Nuclear Studies, Warsaw, Poland
114 Institut für Informatik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
115 Physics department, Faculty of science, University of Zagreb, Zagreb, Croatia
116 SSC IHEP of NRC Kurchatov institute, Protvino, Russia
117 Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA
118 Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padua, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
119 IRFU, CEA, Université Paris-Saclay, Saclay, France; Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
120 Institute for Nuclear Research, Academy of Sciences, Moscow, Russia
121 Department of Physics and Technology, University of Bergen, Bergen, Norway; Dipartimento di Fisica dell’Università and Sezione INFN, Cagliari, Italy
122 INFN, Sezione di Trieste, Trieste, Italy
123 Physics Department, National and Kapodistrian University of Athens, Athens, Greece
124 Chicago State University, Chicago, IL, USA
125 Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
126 European Organization for Nuclear Research (CERN), Geneva, Switzerland; INFN, Sezione di Torino, Turin, Italy; Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
127 Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padua, Italy
128 Technical University of Split FESB, Split, Croatia
129 Warsaw University of Technology, Warsaw, Poland
130 A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia
131 University of Tokyo, Tokyo, Japan
132 Nagasaki Institute of Applied Science, Nagasaki, Japan
133 Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi’, Rome, Italy; INFN, Sezione di Bologna, Bologna, Italy
134 Faculty of Engineering, Bergen University College, Bergen, Norway
135 Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico
136 Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany
137 Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
138 Physik Department, Technische Universität München, Munich, Germany
139 Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France; University of Tsukuba, Tsukuba, Japan
140 Department of Physics, Sejong University, Seoul, Republic of Korea
141 Moscow Engineering Physics Institute, Moscow, Russia; National Research Centre Kurchatov Institute, Moscow, Russia
142 Excellence Cluster Universe, Technische Universität München, Munich, Germany
143 Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
144 Yonsei University, Seoul, Republic of Korea
145 KTO Karatay University, Konya, Turkey
146 Zentrum für Technologietransfer und Telekommunikation (ZTT), Fachhochschule Worms, Worms, Germany
147 Indian Institute of Technology Indore, Indore, India
148 Gangneung-Wonju National University, Gangneung, Republic of Korea
149 California Polytechnic State University, San Luis Obispo, CA, USA
150 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
151 Suranaree University of Technology, Nakhon Ratchasima, Thailand
152 Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia; School of Physics and Astronomy, University of Birmingham, Birmingham, UK
153 Faculty of Technology, Buskerud and Vestfold University College, Tonsberg, Norway
154 Department of Physics, University of Oslo, Oslo, Norway; IRFU, CEA, Université Paris-Saclay, Saclay, France
155 China Institute of Atomic Energy, Beijing, China
156 Dipartimento di Fisica dell’Università and Sezione INFN, Trieste, Italy; INFN, Sezione di Trieste, Trieste, Italy
157 iThemba LABS, National Research Foundation, Somerset West, South Africa; University of the Witwatersrand, Johannesburg, South Africa
158 INFN, Sezione di Roma, Rome, Italy
159 Dipartimento di Fisica dell’Università ‘La Sapienza’ and Sezione INFN, Rome, Italy
160 Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
161 Institute for Theoretical and Experimental Physics, Moscow, Russia; Joint Institute for Nuclear Research (JINR), Dubna, Russia
162 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Warsaw University of Technology, Warsaw, Poland
163 Hiroshima University, Hiroshima, Japan
164 Budker Institute for Nuclear Physics, Novosibirsk, Russia
165 European Organization for Nuclear Research (CERN), Geneva, Switzerland; INFN, Sezione di Bologna, Bologna, Italy
166 Physics Department, University of Rajasthan, Jaipur, India
167 Oak Ridge National Laboratory, Oak Ridge, TN, USA; University of Tennessee, Knoxville, TN, USA
168 INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy
169 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
170 Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padua, Italy; INFN, Sezione di Padova, Padua, Italy
171 National Nuclear Research Center, Baku, Azerbaijan
172 Institute of Physics, Bhubaneswar, India
173 Moscow Engineering Physics Institute, Moscow, Russia; Petersburg Nuclear Physics Institute, Gatchina, Russia
174 Purdue University, West Lafayette, IN, USA
175 Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany; Oak Ridge National Laboratory, Oak Ridge, TN, USA
176 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
177 Moscow Engineering Physics Institute, Moscow, Russia; Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
178 Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine; European Organization for Nuclear Research (CERN), Geneva, Switzerland; Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
179 Physics Department, Panjab University, Chandigarh, India; University of Tennessee, Knoxville, TN, USA
180 Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba; Dipartimento di Fisica dell’Università and Sezione INFN, Turin, Italy
181 Indonesian Institute of Sciences, Jakarta, Indonesia
182 Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia; Technical University of Košice, Kosice, Slovakia
183 Centre de Calcul de l’IN2P3, Lyon, France
184 University of the Witwatersrand, Johannesburg, South Africa
185 Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany; Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
186 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
187 University of Tokyo, Tokyo, Japan; University of Tsukuba, Tsukuba, Japan
188 INFN, Sezione di Bologna, Bologna, Italy; Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
189 Central China Normal University, Wuhan, China; Department of Physics and Technology, University of Bergen, Bergen, Norway
190 Central China Normal University, Wuhan, China; Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France





