Multiplicity dependence of two-particle angular correlations of identified particles in pp collisions at s=13 TeV

ALICE Collaboration

doi:10.1140/epjc/s10052-026-15447-z

Multiplicity dependence of two-particle angular correlations of identified particles in pp collisions at s=13 TeV

ALICE Collaboration

Chair of Nuclear Physics

A.I. Alikhanyan National Science Laboratory (YerPhi)
European Organization for Nuclear Research
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
University of Brescia
INFN Sez. di Torino
Dipartimento di Fisica 'G. Galilei' and INFN
Central China Normal University
GSI Helmholtz Center
University of Science and Technology of China
Fudan University
Niels Bohr Institutet
China Institute of Atomic Energy
LAIC, Université d'Auvergne
University Paris-Sud
Heidelberg University
Institute of Physics of the Czech Academy of Sciences
INFN- Sezione di Trieste
Department of Physics and Technology
University of Bergen
Chungbuk National University
Inha University
Department of Physics
Pusan National University
Department of Physics
University of California at Berkeley
Lawrence Berkeley National Laboratory
Hiroshima University
VECC Kolkata
Rheinische Friedrich-Wilhelms-Universität Bonn
University of Lyon
Physik-Department
Technical University of Munich
University of Texas at Austin
Univ of Mining and Metallurgy
Institut für Kernphysik
University of Münster
National Center for Nuclear Research (NCBJ)
Department of Physics
University of Oslo
Johann Wolfgang Goethe University
Frankfurt Institute for Advanced Studies
P. J. Safarik University
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
Wayne State University
School of Physics and Astronomy
University of Birmingham
University of Jyväskylä
Sezione INFN di Roma La Sapienza
National Research Foundation
University of the Witwatersrand, Johannesburg
University of Split
the University of Utrecht
Wigner Research Centre for Physics
The Indian Institute of Technology Bombay
University of Houston
INFN, Laboratori Nazionali Di Frascati
Physics Department
National and Kapodistrian University of Athens
Instituto de Ciencias Nucleares de la UNAM
Yale University
Science Park 105
Physics Department
University of Jammu
Sezione INFN di Cagliari
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
Warsaw Institute of Technology
Bogolyubov Institute for Theoretical Physics Nasu
Laboratori Nazionali Del Sud
Politecnico di Bari
Dipartimento di Scienze MIFT
Multimedia and Distributed Systems Laboratory
l'institut du thorax
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Bose Institute
High Energy Physics Group
Benemerita Universidad Autonoma de Puebla
Horia Hulubei National Institute of Physics and Nuclear Engineering
University Politehnica of Bucharest
University of Kansas
Physics Department
Panjab University
Homi Bhabha National Institute
University of Campinas
University of Grenoble Alpes
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
BRIN
University of São Paulo
Institute of Space Sciences
Fysiska institutionen
Lund University
Ohio State University
University of Eastern Piedmont
Comenius University
Department of Physics
Aligarh Muslim University
Indian Institute of Technology Indore
Sofia University
Suranaree University of Technology
Nara Women's University
Department of Physics
Gauhati University
Facultad de Ciencias
Universidad Nacional Autónoma de México
Institut Pluridisciplinaire Hubert Curien
University of Tokyo
Creighton University
Marietta Blau Institute
Physikalisches Institut
University of Tübingen
Oak Ridge National Laboratory
Tsukuba University
Korea Institute of Science and Technology Information
National Nuclear Research Center
Czech Technical University in Prague
Environmental and Social Sciences
Faculty of Technology
Wrocław University
UFABC
University of Tennessee
University of Helsinki and Helsinki Institute of Physics
Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN
University of Silesia
University of Cape Town
Physics department
University of Zagreb
China University of Geosciences
Yonsei University
Sungkyunkwan University
Nagasaki Institute of Applied Science
Department of Physics
Sejong University
University of Liverpool
Institute of Experimental Physics Slovak Academy of Sciences
Department of Applied Physics
Instituto de Física
University of Foggia
Technical University of Košice
University of South-Eastern Norway
Universidad Autonoma de Sinaloa
Nuclear Physics Institute of the Cas
Instituto de Física
UFRGS
California Polytechnic State University, San Luis Obispo
Chonbuk National University
Yildiz Technical University
CINVESTAV
Chicago State University
Sección Física
Pontifical Catholic University of Peru San Miguel
Saga University
University of Derby
Politecnico di Torino
University of Pavia
Max-Planck-Institut für Physik
Nuclear Physics Group
STFC Daresbury Laboratory

Research output: Contribution to journal › Article › peer-review

Abstract

Two-particle angular correlations probe particle production mechanisms and the underlying event-wide phenomena present in hadronic collisions. The correlations are examined as a function of rapidity and azimuthal-angle differences (Δy,Δφ) for pairs of like- and unlike-sign pions, kaons, and (anti-)protons produced in pp collisions at s = 13 TeV, measured by the ALICE experiment. Two-particle correlation functions are provided together with Δy and Δφ projections and compared to Monte Carlo (MC) model predictions. For the first time, the measurement is performed as a function of the event’s charged-particle density. Previous studies conducted for pp collisions at s = 7 TeV at ALICE revealed a near-side anticorrelation for baryon–baryon and antibaryon–antibaryon pairs, whose origin remains unresolved. Here, an additional approach is introduced to study the multiplicity dependence and the expected inverse multiplicity scaling of the correlation function. This method highlights qualitative differences in the underlying sources of correlations, such as quantum-statistics effects, final-state interactions, and resonance decays. The puzzling near-side anticorrelation in baryon baryon measurements is observed across all multiplicity classes and continues to challenge current particle-production models. Furthermore, the multiplicity dependence of the correlations between mesons provides an independent probe of the sensitivity of current MC models to soft-QCD effects and hadronization dynamics. The presented measurements, together with the baryon results, enrich the experimental picture of two-particle correlations in pp collisions and serve as valuable input for ongoing theoretical developments.

Original language	English
Article number	756
Journal	European Physical Journal C
Volume	86
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-026-15447-z
State	Published - Jul 2026

Access to Document

10.1140/epjc/s10052-026-15447-z

Cite this

@article{9958e6ec96664285afb6edff02e85729,

title = "Multiplicity dependence of two-particle angular correlations of identified particles in pp collisions at s=13 TeV",

abstract = "Two-particle angular correlations probe particle production mechanisms and the underlying event-wide phenomena present in hadronic collisions. The correlations are examined as a function of rapidity and azimuthal-angle differences (Δy,Δφ) for pairs of like- and unlike-sign pions, kaons, and (anti-)protons produced in pp collisions at s = 13 TeV, measured by the ALICE experiment. Two-particle correlation functions are provided together with Δy and Δφ projections and compared to Monte Carlo (MC) model predictions. For the first time, the measurement is performed as a function of the event{\textquoteright}s charged-particle density. Previous studies conducted for pp collisions at s = 7 TeV at ALICE revealed a near-side anticorrelation for baryon{\textendash}baryon and antibaryon{\textendash}antibaryon pairs, whose origin remains unresolved. Here, an additional approach is introduced to study the multiplicity dependence and the expected inverse multiplicity scaling of the correlation function. This method highlights qualitative differences in the underlying sources of correlations, such as quantum-statistics effects, final-state interactions, and resonance decays. The puzzling near-side anticorrelation in baryon baryon measurements is observed across all multiplicity classes and continues to challenge current particle-production models. Furthermore, the multiplicity dependence of the correlations between mesons provides an independent probe of the sensitivity of current MC models to soft-QCD effects and hadronization dynamics. The presented measurements, together with the baryon results, enrich the experimental picture of two-particle correlations in pp collisions and serve as valuable input for ongoing theoretical developments.",

author = "\{ALICE Collaboration\} and N. Zurlo and Zugravel, \{S. C.\} and A. Zingaretti and Y. Zhu and S. Zhu and J. Zhu and Y. Zhou and D. Zhou and Y. Zhi and V. Zherebchevskii and Z. Zhang and Y. Zhang and Y. Zhang and X. Zhang and S. Zhang and M. Zhang and M. Zhang and L. Zhang and C. Zhang and B. Zhang and P. Z{\'a}vada and N. Zardoshti and F. Zanone and C. Zampolli and V. Zaccolo and A. Yuncu and S. Yuan and H. Yu and Yoon, \{J. H.\} and Yoo, \{I. K.\} and Z. Yin and R. Yin and J. Yi and Yeats, \{E. R.\} and Z. Ye and S. Yano and S. Yang and S. Yang and Y. Yamaguchi and Yadav, \{A. K.\} and A. Yadav and R. Xu and L. Xu and Z. Xiong and K. Xiong and Y. Wu and W. Wu and Wu, \{C. T.\} and Wright, \{J. R.\} and M. Wojnar and J. Witte and B. Windelband and Willems, \{G. A.\} and J. Wilkinson and G. Wilk and J. Wikne and J. Wiechula and Wiacek, \{P. K.\} and Wessels, \{J. P.\} and Wenzel, \{S. C.\} and F. Weiglhofer and Z. Wang and Y. Wang and Y. Wang and D. Wang and C. Wang and J. Wan and J. Vrl{\'a}kov{\'a} and N. Vozniuk and I. Vorobyev and \{von Haller\}, B. and G. Volpe and Voloshin, \{S. A.\} and V{\"o}lkl, \{M. A.\} and A. Vodopyanov and Virta, \{M. M.O.\} and T. Virgili and A. Vinogradov and Villiers, \{C. J.D.\} and A. Villani and Z. Vilakazi and L. Vickovic and M. Verweij and R. V{\'e}rtesi and R. Verma and E. Vercellin and P. Veen and V. Vechernin and \{Vazquez Rueda\}, O. and \{V{\'a}zquez Doce\}, O. and M. Vasileiou and Torres, \{P. Vargas\} and Z. Varga and D. Varga and \{van Weelden\}, \{R. J.G.\} and \{van Veen\}, \{C. A.\} and \{van Leeuwen\}, M. and \{van Doremalen\}, \{L. V.R.\} and N. Valle and M. Vala and M. Vaid and Usai, \{G. L.\} and M. Urioni and A. Uras and S. Upadhyaya and B. Ulukutlu and K. Ullaland and Tveter, \{T. S.\} and R. Turrisi and A. Tumkin and R. Tu and C. Tsolanta and Trzcinski, \{T. P.\} and Trzaska, \{W. H.\} and V. Trubnikov and S. Trogolo and T. Tripathy and S. Tripathy and Triolo, \{A. S.\} and T. Triloki and A. 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Gargiulo and S. Garetti and E. Garcia-Solis and \{Garc{\'i}a Ch{\'a}vez\}, T. and Garcia, \{J. M.\} and C. Garabatos and P. Ganoti and S. Gami and Galvan, \{C. D.\} and T. Gahlaut and Gago, \{A. M.\} and M. Gagliardi and Gaardh{\o}je, \{J. J.\} and T. Fusayasu and A. Furs and C. Furget and N. Funicello and U. Fuchs and H. Fribert and E. Fragiacomo and R. Forynski and U. Follo and S. Fokin and I. Fokin and S. Foertsch and Flores, \{A. N.\} and Fionda, \{F. M.\} and D. Finogeev and Feuillard, \{V. J.G.\} and A. Ferretti and C. Ferrero and A. Ferrero and L. Ferrandi and \{Fern{\'a}ndez T{\'e}llez\}, A. and G. Feofilov and W. Feng and A. Feliciello and A. Fantoni and T. Fang and W. Fan and F. Fan and J. Faivre and M. Faggin and G. Fabbri and L. Fabbietti and D. Evans and G. Eulisse and B. Espagnon and F. Ercolessi and B. Erazmus and D. Elia and R. Ejima and F. Eisenhut and Ehlers, \{R. J.\} and Eder, \{T. M.\} and N. Dzalaiova and P. Dupieux and A. Dubla and Dubinski, \{J. M.\} and L. D{\"o}pper and B. D{\"o}nigus and A. Dobrin and U. Dmitrieva and R. Divi{\`a} and J. Ditzel and Y. Ding and B. Diab and \{Di Ruzza\}, B. and \{Di Mauro\}, A. and \{Di Costanzo\}, M. and \{Di Bari\}, D. and P. Dhankher and \{de Souza\}, \{G. G.A.\} and Stritto, \{L. Dello\} and \{Del Grande\}, R. and R. Deb and \{De Pasquale\}, S. and \{De Martin\}, C. and \{De Marco\}, N. and \{De Gruttola\}, D. and \{De Falco\}, A. and \{de Cuveland\}, J. and \{de Cataldo\}, G. and \{De Caro\}, A. and S. Dash and Dash, \{A. R.\} and S. Das and P. Das and A. Daribayeva and A. Danu and Danisch, \{M. C.\} and G. Dange and A. Dainese and Czarnynoga, \{M. M.\} and P. Crochet and S. Costanza and F. Costa and Cosentino, \{M. R.\} and P. Cortese and Coquet, \{M. L.\} and Contreras, \{J. G.\} and G. Contin and \{del Valle\}, \{Z. Conesa\} and Balbastre, \{G. Conesa\} and M. Concas and M. Colocci and A. Colelli and D. Colella and F. Colamaria and F. Cindolo and G. Cimador and C. Cicalo and M. Ciacco and B. Chytla and T. Chujo and P. Christiansen and Christensen, \{C. H.\} and P. Christakoglou and Chochulska, \{Z. A.\} and P. Chochula and S. Cho and J. Cho and Chizzali, \{E. S.\} and F. Chinu and Chinellato, \{D. D.\} and Barroso, \{V. Chibante\} and D. Chiappara and C. Cheshkov and T. Cheng and M. Chen and S. Chattopadhay and M. Chartier and S. Chapeland and S. Chandra and Chan, \{J. W.O.\} and P. Chakraborty and I. Chakaberia and R. Cerri and S. Cattaruzzi and F. Catalano and M. Castoldi and \{Castillo Castellanos\}, J. and Carvalho, \{L. A.D.\} and F. Carnesecchi and M. Carabas and Cantway, \{S. L.\} and S. Cannito and Canedo, \{F. D.M.\} and Camerlingo, \{M. T.\} and P. Camerini and Camacho, \{J. M.M.\} and \{Calvo Villar\}, E. and A. Caliva and H. Caines and Cabrera, \{M. F.T.\} and \{Cabanillas Noris\}, \{J. C.\} and C. Carr and A. Bylinkin and Z. Buthelezi and N. Burmasov and P. Buhler and S. Bufalino and H. Buesching and Buckland, \{M. D.\} and Buchakchiev, \{V. D.\} and Bruno, \{G. E.\} and M. Broz and M. Bregant and P. Braun-Munzinger and L. Bratrud and Brandibur, \{D. C.\} and Bouziani, \{Y. E.M.\} and N. Bouchhar and E. Botta and Carcamo, \{A. G.Borquez\} and A. Borissov and H. Borel and G. Bonomi and Bond, \{P. M.\} and M. Bombara and L. Boldizs{\'a}r and T. Bodova and F. Bock and C. Blume and N. Bluhme and Blidaru, \{M. B.\} and D. Blau and S. Biswas and G. Biro and A. Binoy and A. Bilandzic and J. Biel{\v c}{\'i}kov{\'a} and J. Biel{\v c}{\'i}k and L. Bianchi and S. Bhattarai and B. Bhattacharjee and A. Bhasin and T. Bhalla and Bhaduri, \{P. P.\} and L. Betev and L. Bernardinis and L. Bergmann and A. Berdnikova and Y. Berdnikov and S. Beole and A. Bensaoula and G. Bencedi and Beltran, \{Y. A.V.\} and Beltran, \{L. G.E.\} and R. Bellwied and F. Bellini and Bella, \{V. D.\} and I. Belikov and S. Behera and D. Behera and P. Becht and Bearden, \{I. G.\} and Alba, \{J. L.Bazo\} and D. Bauri and L. Baudino and B. Batyunya and D. Battistini and G. Batigne and N. Bastid and E. Bartsch and K. Barth and L. Barreto and V. Barret and E. Barreau and Barnby, \{L. S.\} and Barnaf{\"o}ldi, \{G. G.\} and B. Barman and M. Barlou and L. Barioglio and F. Barile and V. Barbasova and Z. Banoo and S. Bangalia and B. Balis and A. Baldisseri and R. Bala and Y. Bailung and R. Bailhache and X. Bai and Baek, \{Y. W.\} and Y. Bae and J. Bae and A. Badal{\`a} and Babu, \{A. R.J.\} and H. Baba and Azmi, \{M. D.\} and R. Averbeck and A. Augustinus and M. Arslandok and Arsene, \{I. C.\} and Arneiro, \{J. G.M.C.A.\} and R. Arnaldi and S. Arcelli and H. Appelsh{\"a}user and N. Apadula and P. Antonioli and F. Antinori and V. Anguelov and M. Angeletti and E. Andronov and A. Andronic and N. Andreou and C. Andrei and I. Altsybeev and T. Alt and G. Alocco and J. Alme and A. Alkin and A. Alici and B. Ali and \{Alfaro Molina\}, R. and B. Alessandro and D. Aleksandrov and M. Al-Turany and V. Akishina and A. Akindinov and Akbar, \{Z. U.L.\} and I. Ahuja and S. Ahmad and Z. Ahammed and N. Agrawal and L. Aglietta and Rinella, \{G. Aglieri\} and S. Acharya and Abualrob, \{I. J.\}",

note = "Publisher Copyright: {\textcopyright} CERN for the benefit of the ALICE Collaboration 2026.",

year = "2026",

month = jul,

doi = "10.1140/epjc/s10052-026-15447-z",

language = "English",

volume = "86",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "7",

}

TY - JOUR

T1 - Multiplicity dependence of two-particle angular correlations of identified particles in pp collisions at s=13 TeV

AU - ALICE Collaboration

AU - Zurlo, N.

AU - Zugravel, S. C.

AU - Zingaretti, A.

AU - Zhu, Y.

AU - Zhu, S.

AU - Zhu, J.

AU - Zhou, Y.

AU - Zhou, D.

AU - Zhi, Y.

AU - Zherebchevskii, V.

AU - Zhang, Z.

AU - Zhang, Y.

AU - Zhang, X.

AU - Zhang, S.

AU - Zhang, M.

AU - Zhang, L.

AU - Zhang, C.

AU - Zhang, B.

AU - Závada, P.

AU - Zardoshti, N.

AU - Zanone, F.

AU - Zampolli, C.

AU - Zaccolo, V.

AU - Yuncu, A.

AU - Yuan, S.

AU - Yu, H.

AU - Yoon, J. H.

AU - Yoo, I. K.

AU - Yin, Z.

AU - Yin, R.

AU - Yi, J.

AU - Yeats, E. R.

AU - Ye, Z.

AU - Yano, S.

AU - Yang, S.

AU - Yamaguchi, Y.

AU - Yadav, A. K.

AU - Yadav, A.

AU - Xu, R.

AU - Xu, L.

AU - Xiong, Z.

AU - Xiong, K.

AU - Wu, Y.

AU - Wu, W.

AU - Wu, C. T.

AU - Wright, J. R.

AU - Wojnar, M.

AU - Witte, J.

AU - Windelband, B.

AU - Willems, G. A.

AU - Wilkinson, J.

AU - Wilk, G.

AU - Wikne, J.

AU - Wiechula, J.

AU - Wiacek, P. K.

AU - Wessels, J. P.

AU - Wenzel, S. C.

AU - Weiglhofer, F.

AU - Wang, Z.

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AU - Wang, C.

AU - Wan, J.

AU - Vrláková, J.

AU - Vozniuk, N.

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PY - 2026/7

Y1 - 2026/7

N2 - Two-particle angular correlations probe particle production mechanisms and the underlying event-wide phenomena present in hadronic collisions. The correlations are examined as a function of rapidity and azimuthal-angle differences (Δy,Δφ) for pairs of like- and unlike-sign pions, kaons, and (anti-)protons produced in pp collisions at s = 13 TeV, measured by the ALICE experiment. Two-particle correlation functions are provided together with Δy and Δφ projections and compared to Monte Carlo (MC) model predictions. For the first time, the measurement is performed as a function of the event’s charged-particle density. Previous studies conducted for pp collisions at s = 7 TeV at ALICE revealed a near-side anticorrelation for baryon–baryon and antibaryon–antibaryon pairs, whose origin remains unresolved. Here, an additional approach is introduced to study the multiplicity dependence and the expected inverse multiplicity scaling of the correlation function. This method highlights qualitative differences in the underlying sources of correlations, such as quantum-statistics effects, final-state interactions, and resonance decays. The puzzling near-side anticorrelation in baryon baryon measurements is observed across all multiplicity classes and continues to challenge current particle-production models. Furthermore, the multiplicity dependence of the correlations between mesons provides an independent probe of the sensitivity of current MC models to soft-QCD effects and hadronization dynamics. The presented measurements, together with the baryon results, enrich the experimental picture of two-particle correlations in pp collisions and serve as valuable input for ongoing theoretical developments.

AB - Two-particle angular correlations probe particle production mechanisms and the underlying event-wide phenomena present in hadronic collisions. The correlations are examined as a function of rapidity and azimuthal-angle differences (Δy,Δφ) for pairs of like- and unlike-sign pions, kaons, and (anti-)protons produced in pp collisions at s = 13 TeV, measured by the ALICE experiment. Two-particle correlation functions are provided together with Δy and Δφ projections and compared to Monte Carlo (MC) model predictions. For the first time, the measurement is performed as a function of the event’s charged-particle density. Previous studies conducted for pp collisions at s = 7 TeV at ALICE revealed a near-side anticorrelation for baryon–baryon and antibaryon–antibaryon pairs, whose origin remains unresolved. Here, an additional approach is introduced to study the multiplicity dependence and the expected inverse multiplicity scaling of the correlation function. This method highlights qualitative differences in the underlying sources of correlations, such as quantum-statistics effects, final-state interactions, and resonance decays. The puzzling near-side anticorrelation in baryon baryon measurements is observed across all multiplicity classes and continues to challenge current particle-production models. Furthermore, the multiplicity dependence of the correlations between mesons provides an independent probe of the sensitivity of current MC models to soft-QCD effects and hadronization dynamics. The presented measurements, together with the baryon results, enrich the experimental picture of two-particle correlations in pp collisions and serve as valuable input for ongoing theoretical developments.

UR - https://www.scopus.com/pages/publications/105044256059

U2 - 10.1140/epjc/s10052-026-15447-z

DO - 10.1140/epjc/s10052-026-15447-z

M3 - Article

AN - SCOPUS:105044256059

SN - 1434-6044

VL - 86

JO - European Physical Journal C

JF - European Physical Journal C

IS - 7

M1 - 756

ER -

Multiplicity dependence of two-particle angular correlations of identified particles in pp collisions at s=13 TeV

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