Long-Range Transverse-Momentum Correlations and Radial Flow in Pb-Pb Collisions at the LHC

(ALICE Collaboration)

doi:10.1103/l36g-6f46

Long-Range Transverse-Momentum Correlations and Radial Flow in Pb-Pb Collisions at the LHC

(ALICE Collaboration)

Sección de Física

National Institute for Nuclear Physics
CERN
Variable Energy Cyclotron Centre
Aligarh Muslim University
Korea Institute of Science and Technology Information
Pavol Jozef Šafárik University
National Research and Innovation Agency Republic of Indonesia
Goethe University Frankfurt
GSI Helmholtz Centre for Heavy Ion Research
Central China Normal University
Universidad Nacional Autónoma de México
University of Houston
Sungkyunkwan University
University of Bergen
Technical University of Munich
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Derby
University of Münster
Heidelberg University
Lawrence Berkeley National Laboratory
Université Grenoble Alpes
Universidade de São Paulo
University of Oslo
Yale University
The University of Tokyo
Kangwon National University
University of Science and Technology of China
Indian Institute of Technology Indore
University of Jammu
Université Paris-Saclay
AGH University of Krakow
University of Kansas
National and Kapodistrian University of Athens
Gauhati University
Wigner Research Centre for Physics
Nantes Université
Université Clermont Auvergne
Lund University
Indian Institute of Technology Bombay
University of Copenhagen
Université de Strasbourg
Universidad Autonoma de Sinaloa
Benemerita Universidad Autonoma de Puebla
Panjab University
Faculty of Nuclear Sciences and Physical Engineering
Czech Academy of Sciences
Bose Institute
Oak Ridge National Laboratory
Pusan National University
University of Brescia
Institute for Space Sciences
Polytechnic University of Bari
Sofia University
STFC Daresbury Laboratory
Austrian Academy of Sciences
National Research Foundation
University of the Witwatersrand
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Pontificia Universidad Católica del Perú
National University of Science and Technology POLITEHNICA Bucharest
Warsaw University of Technology
University of Liverpool
Fudan University
Université de Lyon
Max Planck Institute for Physics (Werner Heisenberg Institute)
Inha University
Homi Bhabha National Institute
National Institute for Subatomic Physics
University of Tsukuba
Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile
University of Birmingham
University of Eastern Piedmont
Universidade Federal do ABC
University of Pavia
University of California at Berkeley
University of Foggia
Comenius University
Hiroshima University
Polytechnic University of Turin
University of Texas at Austin
Saga University
Chicago State University
Universidade Federal do Rio Grande do Sul
University of Tennessee, Knoxville
Wayne State University
University of Split
Utrecht University
A. Alikhanian Yerevan Institute of Physics
China National Nuclear Corporation
Nagasaki Institute of Applied Science
Yonsei University
University of Jyväskylä
University of Bonn
Faculty of Technology
Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional
Ohio State University
Technical University of Kosice
Universidade Estadual de Campinas
Suranaree University of Technology
Slovak Academy of Sciences
Yildiz Technical University
Jeonbuk National University
Sejong University
California Polytechnic State University, San Luis Obispo
University of Zagreb
National Centre for Nuclear Research
University of Catania
University of South-Eastern Norway
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Messina
University of Helsinki
Chungbuk National University
China University of Geosciences, Wuhan
Creighton University
University of Wrocław
National Nuclear Research Center
University of Tübingen
Nara Women's University
NASU - Bogolyubov Institute for Theoretical Physics

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

9 Scopus citations

Abstract

This Letter presents measurements of long-range transverse-momentum correlations using a new observable, v0(pT), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium's properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at sNN=5.02 TeV, recorded by the ALICE detector. A pseudorapidity-gap technique, similar to that used in anisotropic-flow studies, is employed to suppress short-range correlations. At low pT, a characteristic mass ordering consistent with hydrodynamic collective flow is observed. At higher pT (>3 GeV/c), protons exhibit larger v0(pT) than pions and kaons, in agreement with expectations from quark-recombination models. Comparisons to viscous hydrodynamic calculations with varying bulk viscosity and equation of state demonstrate the sensitivity of the v0(pT) observable to these key medium properties. The findings establish v0(pT) as a valuable addition to the set of observables used in Bayesian analyses for extracting the transport properties and constraining the equation of state of strongly interacting matter, while also helping to systematically explore its sensitivity and impact within such global studies.

Original language	English
Article number	032302
Journal	Physical Review Letters
Volume	136
Issue number	3
DOIs	https://doi.org/10.1103/l36g-6f46
State	Published - 23 Jan 2026

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10.1103/l36g-6f46

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@article{39cfda7c995644fa9e48b63dc364d46a,

title = "Long-Range Transverse-Momentum Correlations and Radial Flow in Pb-Pb Collisions at the LHC",

abstract = "This Letter presents measurements of long-range transverse-momentum correlations using a new observable, v0(pT), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium's properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at sNN=5.02 TeV, recorded by the ALICE detector. A pseudorapidity-gap technique, similar to that used in anisotropic-flow studies, is employed to suppress short-range correlations. At low pT, a characteristic mass ordering consistent with hydrodynamic collective flow is observed. At higher pT (>3 GeV/c), protons exhibit larger v0(pT) than pions and kaons, in agreement with expectations from quark-recombination models. Comparisons to viscous hydrodynamic calculations with varying bulk viscosity and equation of state demonstrate the sensitivity of the v0(pT) observable to these key medium properties. The findings establish v0(pT) as a valuable addition to the set of observables used in Bayesian analyses for extracting the transport properties and constraining the equation of state of strongly interacting matter, while also helping to systematically explore its sensitivity and impact within such global studies.",

author = "\{(ALICE Collaboration)\} and S. Acharya and \{Aglieri Rinella\}, G. and L. Aglietta and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, \{S. U.\} and I. Ahuja and Z. Akbar and A. Akindinov and V. Akishina and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and B. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and G. Alocco and T. Alt and Altamura, \{A. R.\} and I. Altsybeev and Anaam, \{M. N.\} and C. Andrei and N. Andreou and A. Andronic and E. Andronov and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and H. Appelsh{\"a}user and C. Arata and S. Arcelli and R. Arnaldi and Arneiro, \{J. G.M.C.A.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and D. Averyanov and Azmi, \{M. D.\} and H. Baba and A. Badal{\`a} and \{Bazo Alba\}, \{J. L.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} 2026 CERN.",

year = "2026",

month = jan,

day = "23",

doi = "10.1103/l36g-6f46",

language = "English",

volume = "136",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "3",

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TY - JOUR

T1 - Long-Range Transverse-Momentum Correlations and Radial Flow in Pb-Pb Collisions at the LHC

AU - (ALICE Collaboration)

AU - Acharya, S.

AU - Aglieri Rinella, G.

AU - Aglietta, L.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akbar, Z.

AU - Akindinov, A.

AU - Akishina, V.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altamura, A. R.

AU - Altsybeev, I.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, N.

AU - Andronic, A.

AU - Andronov, E.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Appelshäuser, H.

AU - Arata, C.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arneiro, J. G.M.C.A.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Averyanov, D.

AU - Azmi, M. D.

AU - Baba, H.

AU - Badalà, A.

AU - Bazo Alba, J. L.

AU - Gago, A. M.

PY - 2026/1/23

Y1 - 2026/1/23

N2 - This Letter presents measurements of long-range transverse-momentum correlations using a new observable, v0(pT), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium's properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at sNN=5.02 TeV, recorded by the ALICE detector. A pseudorapidity-gap technique, similar to that used in anisotropic-flow studies, is employed to suppress short-range correlations. At low pT, a characteristic mass ordering consistent with hydrodynamic collective flow is observed. At higher pT (>3 GeV/c), protons exhibit larger v0(pT) than pions and kaons, in agreement with expectations from quark-recombination models. Comparisons to viscous hydrodynamic calculations with varying bulk viscosity and equation of state demonstrate the sensitivity of the v0(pT) observable to these key medium properties. The findings establish v0(pT) as a valuable addition to the set of observables used in Bayesian analyses for extracting the transport properties and constraining the equation of state of strongly interacting matter, while also helping to systematically explore its sensitivity and impact within such global studies.

AB - This Letter presents measurements of long-range transverse-momentum correlations using a new observable, v0(pT), serving as a probe of event-by-event radial-flow fluctuations, the underlying radial expansion, and the medium's properties in heavy-ion collisions. Results are reported for inclusive charged particles, pions, kaons, and protons across various centrality intervals in Pb-Pb collisions at sNN=5.02 TeV, recorded by the ALICE detector. A pseudorapidity-gap technique, similar to that used in anisotropic-flow studies, is employed to suppress short-range correlations. At low pT, a characteristic mass ordering consistent with hydrodynamic collective flow is observed. At higher pT (>3 GeV/c), protons exhibit larger v0(pT) than pions and kaons, in agreement with expectations from quark-recombination models. Comparisons to viscous hydrodynamic calculations with varying bulk viscosity and equation of state demonstrate the sensitivity of the v0(pT) observable to these key medium properties. The findings establish v0(pT) as a valuable addition to the set of observables used in Bayesian analyses for extracting the transport properties and constraining the equation of state of strongly interacting matter, while also helping to systematically explore its sensitivity and impact within such global studies.

UR - https://www.scopus.com/pages/publications/105028656957

U2 - 10.1103/l36g-6f46

DO - 10.1103/l36g-6f46

M3 - Article

AN - SCOPUS:105028656957

SN - 0031-9007

VL - 136

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 032302

ER -

Long-Range Transverse-Momentum Correlations and Radial Flow in Pb-Pb Collisions at the LHC

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