Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb–Pb collisions at sNN=5.02 TeV

ALICE Collaboration

doi:10.1016/j.physletb.2024.139017

Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ⁰ photoproduction in Pb–Pb collisions at s_NN=5.02 TeV

ALICE Collaboration

Clermont-Auvergne University
Nuclear Physics Institute ASCR
Variable Energy Cyclotron Centre India
European Organization for Nuclear Research
INFN Sezione di Torino
INFN Sezione di Bologna
Aligarh Muslim University
Korea Institute of Science and Technology Information
University of P.J. Šafárik
FIAS
GSI Helmholtzzentrum fur Schwerionenforschung
Central China Normal University
Universidad Nacional Autónoma de México
University of Houston
Sungkyunkwan University
University of Bergen
Sezione INFN di Cagliari
Goethe University Frankfurt am Main
INFN Sezione di Bari
Technical University of Munich
Benemerita Universidad Autonoma de Puebla
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Derby
University of Münster
University of Heidelberg
INFN
Ernest Orlando Lawrence Berkeley National Laboratory
Université de Nantes
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
University of São Paulo
University of Oslo
Yale University
Université Paris-Saclay
University of Tokyo
INFN Sezione di Catania
Kangwon National University
University of Science and Technology of China
Indian Institute of Technology Indore
University of Jammu
Agh University of Science and Technology Faculty of Computer Science
Bose Institute
University of Athens
Gauhati University
Wigner Research Centre for Physics
University of Liverpool
Lund University
Indian Institute of Technology Bombay
Pontificia Universidad Católica del Perú
Niels Bohr Institutet
Université de Strasbourg
Universidad Autonoma de Sinaloa
Institute of Space Sciences
LNF-INFN
Czech Technical University in Prague
The University of Texas at Austin
University of Pavia
INFN Sezione di Pavia
Oak Ridge National Laboratory
Pusan National University
University of Brescia
Politecnico di Bari
Sofia University St. Kliment Ohridski
INFN Sezione di Trieste
Stefan Meyer Institute for Subatomic Physics (SMI)
National Research Foundation
University of the Witwatersrand, Johannesburg
Institute for Nuclear Physics
Sezione di Roma
University 'Politehnica' of Bucharest
University of Lyon
Warsaw University of Technology
An OCC of Homi Bhabha National Institute
Fudan University
University of Campinas (UNICAMP)
Max-Planck-Institut für Physik
Inha University
Science Park 105
University of Tsukuba
ENEA Climate Modeling and Impacts
University of Birmingham
Laboratory of Molecular Pathology
Federal University of ABC (UFABC)
University of California, Berkeley
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Cape Town
Comenius University
Hiroshima University
Politecnico di Torino
Saga University
Chicago State University
University of Kansas
Universidade Federal do Rio Grande do Sul
University of Tennessee
Nagasaki Institute of Applied Science
Wayne State University
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Universiteit Utrecht
Yerevan Physics Institute
Yonsei University
University of Jyväskylä
University Bonn
Western Norway University of Applied Sciences
CINVESTAV-IPN
The Ohio State University
Technical University of Kosice
National Research and Innovation Agency - BRIN
China Institute of Atomic Energy
Instituto de Ciencias Nucleares de la UNAM
Suranaree University of Technology
Institute of Experimental Physics Slovak Academy of Sciences
KTO Karatay University
Yildiz Technical University
University of Zagreb
Zentrum für Technologie und Transfer (ZTT)
Chonbuk National University
Sejong University
California Polytechnic State University, San Luis Obispo
Panjab University
National Centre for Nuclear Research (NCBJ)
Università degli Studi di Catania
University College of Southeast Norway
Daresbury Laboratory
University of Messina
Università di Foggia
Helsinki Institute of Physics
Chungbuk National University
China University of Geosciences
Creighton University
Wroclaw University
National Nuclear Research Center
University of Tübingen
Nara Women's University
Bogolyubov Institute for Theoretical Physics Nasu
Institute of Physics of the Czech Academy of Sciences

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

9 Citations (Scopus)

Résumé

This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced ρ⁰ mesons. The ρ⁰ mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos⁡(2ϕ) modulation, where ϕ is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb–Pb collisions at a center-of-mass energy of s_NN=5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos⁡(2ϕ) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos⁡(2ϕ) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.

langue originale	Anglais
Numéro d'article	139017
journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	858
Les DOIs	https://doi.org/10.1016/j.physletb.2024.139017
état	Publié - 1 nov. 2024
Modification externe	Oui

Accès au document

10.1016/j.physletb.2024.139017

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Contient cette citation

@article{b2c8de49daf94e00973f812d76505fc7,

title = "Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb{\textendash}Pb collisions at sNN=5.02 TeV",

abstract = "This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced ρ0 mesons. The ρ0 mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos⁡(2ϕ) modulation, where ϕ is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb{\textendash}Pb collisions at a center-of-mass energy of sNN=5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos⁡(2ϕ) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos⁡(2ϕ) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.",

author = "\{ALICE Collaboration\} and S. Acharya and D. Adamov{\'a} and A. Agarwal 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 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 Alvarado, \{J. R.\} and Alvarez, \{C. O.R.\} 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 L. Aphecetche and H. Appelsh{\"a}user and C. Arata and S. Arcelli and M. Aresti and R. Arnaldi and Arneiro, \{J. G.M.C.A.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and A. Shatat",

note = "Publisher Copyright: {\textcopyright} 2024 CERN for the benefit of the ALICE Collaboration",

year = "2024",

month = nov,

day = "1",

doi = "10.1016/j.physletb.2024.139017",

language = "English",

volume = "858",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb–Pb collisions at sNN=5.02 TeV

AU - ALICE Collaboration

AU - Acharya, S.

AU - Adamová, D.

AU - Agarwal, A.

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 - 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 - Alvarado, J. R.

AU - Alvarez, C. O.R.

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 - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arata, C.

AU - Arcelli, S.

AU - Aresti, M.

AU - Arnaldi, R.

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

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Shatat, A.

PY - 2024/11/1

Y1 - 2024/11/1

N2 - This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced ρ0 mesons. The ρ0 mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos⁡(2ϕ) modulation, where ϕ is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb–Pb collisions at a center-of-mass energy of sNN=5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos⁡(2ϕ) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos⁡(2ϕ) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.

AB - This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced ρ0 mesons. The ρ0 mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos⁡(2ϕ) modulation, where ϕ is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb–Pb collisions at a center-of-mass energy of sNN=5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos⁡(2ϕ) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos⁡(2ϕ) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.

UR - https://www.scopus.com/pages/publications/85204389624

U2 - 10.1016/j.physletb.2024.139017

DO - 10.1016/j.physletb.2024.139017

M3 - Article

AN - SCOPUS:85204389624

SN - 0370-2693

VL - 858

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 139017