https://doi.org/10.1140/epjc/s10052-017-5129-6
Regular Article - Experimental Physics
Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at 
TeV
1
A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia
2
Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
3
Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine
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Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Bose Institute, Kolkata, India
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Budker Institute for Nuclear Physics, Novosibirsk, Russia
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California Polytechnic State University, San Luis Obispo, CA, USA
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Central China Normal University, Wuhan, China
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Centre de Calcul de l’IN2P3, Villeurbanne, Lyon, France
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Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba
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Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
11
Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico
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Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Rome, Italy
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Chicago State University, Chicago, IL, USA
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China Institute of Atomic Energy, Beijing, China
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Commissariat à l’Energie Atomique, IRFU, Saclay, France
16
COMSATS Institute of Information Technology (CIIT), Islamabad, Pakistan
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Departamento de Física de Partículas and IGFAE, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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Department of Physics, Aligarh Muslim University, Aligarh, India
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Department of Physics, Ohio State University, Columbus, OH, USA
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Department of Physics, Sejong University, Seoul, South Korea
21
Department of Physics, University of Oslo, Oslo, Norway
22
Department of Physics and Technology, University of Bergen, Bergen, Norway
23
Dipartimento di Fisica dell’Università ‘La Sapienza’ and Sezione INFN, Rome, Italy
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Dipartimento di Fisica dell’Università and Sezione INFN, Cagliari, Italy
25
Dipartimento di Fisica dell’Università and Sezione INFN, Trieste, Italy
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Dipartimento di Fisica dell’Università and Sezione INFN, Turin, Italy
27
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy
28
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, Italy
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Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padua, Italy
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Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy
31
Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy
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Dipartimento di Scienze e Innovazione Tecnologica dell’Università del Piemonte Orientale and INFN Sezione di Torino, Alessandria, Italy
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Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy
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Division of Experimental High Energy Physics, University of Lund, Lund, Sweden
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European Organization for Nuclear Research (CERN), Geneva, Switzerland
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Excellence Cluster Universe, Technische Universität München, Munich, Germany
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Faculty of Engineering, Bergen University College, Bergen, Norway
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Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
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Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
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Faculty of Science, P.J. Šafárik University, Kosice, Slovakia
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Faculty of Technology, Buskerud and Vestfold University College, Tonsberg, Norway
42
Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
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Gangneung-Wonju National University, Gangneung, South Korea
44
Department of Physics, Gauhati University, Guwahati, India
45
Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
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Helsinki Institute of Physics (HIP), Helsinki, Finland
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Hiroshima University, Hiroshima, Japan
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Indian Institute of Technology Bombay (IIT), Mumbai, India
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Indian Institute of Technology Indore, Indore, India
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Indonesian Institute of Sciences, Jakarta, Indonesia
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Inha University, Incheon, South Korea
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Institut de Physique Nucléaire d’Orsay (IPNO), Université Paris-Sud, CNRS-IN2P3, Orsay, France
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Institute for Nuclear Research, Academy of Sciences, Moscow, Russia
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Institute for Subatomic Physics of Utrecht University, Utrecht, The Netherlands
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Institute for Theoretical and Experimental Physics, Moscow, Russia
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Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
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Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Institute of Physics, Bhubaneswar, India
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Institute of Space Science (ISS), Bucharest, Romania
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Institut für Informatik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
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Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
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Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
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Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico
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Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
65
Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
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Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, CNRS-IN2P3, Strasbourg, France
67
iThemba LABS, National Research Foundation, Somerset West, South Africa
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Joint Institute for Nuclear Research (JINR), Dubna, Russia
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Konkuk University, Seoul, South Korea
70
Korea Institute of Science and Technology Information, Daejeon, South Korea
71
KTO Karatay University, Konya, Turkey
72
Laboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, France
73
Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France
74
Laboratori Nazionali di Frascati, INFN, Frascati, Italy
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Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy
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Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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Moscow Engineering Physics Institute, Moscow, Russia
78
Nagasaki Institute of Applied Science, Nagasaki, Japan
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Physics Department, National and Kapodistrian University of Athens, Athens, Greece
80
National Centre for Nuclear Studies, Warsaw, Poland
81
National Institute for Physics and Nuclear Engineering, Bucharest, Romania
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National Institute of Science Education and Research, Bhubaneswar, India
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National Research Centre Kurchatov Institute, Moscow, Russia
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Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
85
Nikhef, Nationaal instituut voor subatomaire fysica, Amsterdam, The Netherlands
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Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, UK
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Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech Republic
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Oak Ridge National Laboratory, Oak Ridge, TN, USA
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Petersburg Nuclear Physics Institute, Gatchina, Russia
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Physics Department, Creighton University, Omaha, NE, USA
91
Physics Department, Panjab University, Chandigarh, India
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Physics Department, University of Cape Town, Cape Town, South Africa
93
Physics Department, University of Jammu, Jammu, India
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Physics Department, University of Rajasthan, Jaipur, India
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Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany
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Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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Physik Department, Technische Universität München, Munich, Germany
98
Purdue University, West Lafayette, IN, USA
99
Pusan National University, Pusan, South Korea
100
Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
101
Rudjer Bošković Institute, Zagreb, Croatia
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Russian Federal Nuclear Center (VNIIEF), Sarov, Russia
103
Saha Institute of Nuclear Physics, Kolkata, India
104
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
105
Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru
106
Sezione INFN, Bari, Italy
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Sezione INFN, Bologna, Italy
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Sezione INFN, Cagliari, Italy
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Sezione INFN, Catania, Italy
110
Sezione INFN, Padua, Italy
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Sezione INFN, Rome, Italy
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Sezione INFN, Trieste, Italy
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Sezione INFN, Turin, Italy
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SSC IHEP of NRC Kurchatov Institute, Protvino, Russia
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Stefan Meyer Institut für Subatomare Physik (SMI), Vienna, Austria
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SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
117
Suranaree University of Technology, Nakhon Ratchasima, Thailand
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Technical University of Košice, Kosice, Slovakia
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Technical University of Split FESB, Split, Croatia
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The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
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Physics Department, The University of Texas at Austin, Austin, TX, USA
122
Universidad Autónoma de Sinaloa, Culiacán, Mexico
123
Universidade de São Paulo (USP), São Paulo, Brazil
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Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
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Universidade Federal do ABC, Santo Andre, Brazil
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University of Houston, Houston, TX, USA
127
University of Jyväskylä, Jyväskylä, Finland
128
University of Liverpool, Liverpool, UK
129
University of Tennessee, Knoxville, TN, USA
130
University of the Witwatersrand, Johannesburg, South Africa
131
University of Tokyo, Tokyo, Japan
132
University of Tsukuba, Tsukuba, Japan
133
University of Zagreb, Zagreb, Croatia
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Université de Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, Villeurbanne, Lyon, France
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Università di Brescia, Brescia, Italy
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V. Fock Institute for Physics, St. Petersburg State University, St. Petersburg, Russia
137
Variable Energy Cyclotron Centre, Kolkata, India
138
Warsaw University of Technology, Warsaw, Poland
139
Wayne State University, Detroit, MI, USA
140
Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
141
Yale University, New Haven, CT, USA
142
Yonsei University, Seoul, South Korea
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Zentrum für Technologietransfer und Telekommunikation (ZTT), Fachhochschule Worms, Worms, Germany
144
CERN, 1211, Geneva 23, Switzerland
* e-mail: alice-publications@cern.ch
Received:
11
January
2017
Accepted:
2
August
2017
Published online:
24
August
2017
Two-particle angular correlations were measured in pp collisions at 
TeV for pions, kaons, protons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected peak dominated by effects associated with mini-jets and are well reproduced by general purpose Monte Carlo generators. However, for baryon–baryon and anti-baryon–anti-baryon pairs, where both particles have the same baryon number, a near-side anti-correlation structure is observed instead of a peak. This effect is interpreted in the context of baryon production mechanisms in the fragmentation process. It currently presents a challenge to Monte Carlo models and its origin remains an open question.
© CERN for the benefit of the ALICE collaboration, 2017
