Measurement of isolated-prompt photon–hadron correlations in Pb–Pb collisions at $$\sqrt{{s}_{{\textrm{NN}}}} = 5.02$$ TeV

Abstract The ALICE Collaboration has measured the azimuthal correlation between trigger isolated-prompt photons and associated charged hadrons in Pb–Pb collisions at the CERN LHC, at a centre-of-mass energy per nucleon pair of $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ s NN = 5.02 TeV. The trigger isolated-prompt photons are measured in the transverse-momentum range $$18 18 < p T γ < 40 GeV/ c and pseudorapidity range $$|\eta ^{\gamma }| <0.67$$ | η γ | < 0.67 . The isolation selection is based on a charged particle isolation momentum threshold $$p_{\textrm{T}}^{\mathrm{iso,\,ch}} = 1.5$$ p T iso , ch = 1.5 GeV/ c within a cone of radius $$R=0.2$$ R = 0.2 . The associated charged particles are measured in the transverse-momentum ranges $$p_{\textrm{T}}^{\textrm{h}} > 1.8$$ p T h > 1.8 GeV/ c and pseudorapidity $$|\eta ^{{\textrm{h}}}| <0.9$$ | η h | < 0.9 . The yield D( $$z_{\textrm{T}}$$ z T ) of associated hadrons per trigger, with $$z_{\textrm{T}} = p_{\textrm{T}}^{{\textrm{h}}}/p_{\textrm{T}}^{\gamma }$$ z T = p T h / p T γ , is measured in three Pb–Pb collision centrality classes: central (0–30%), semicentral (30–50%), and peripheral (50–90%). The D( $$z_{\textrm{T}}$$ z T

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Journal
The European Physical Journal C
Published
2026-09-28
DOI
https://doi.org/10.1140/epjc/s10052-026-16192-z
Primary Topic
High-Energy Particle Collisions Research
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article
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Measurement of isolated-prompt photon–hadron correlations in Pb–Pb collisions at $$\sqrt{{s}_{{\textrm{NN}}}} = 5.02$$ TeV

K. Barth, N. Agrawal, I. G. Bearden, A. Augustinus et al.
The European Physical Journal C
High-Energy Particle Collisions Research
article

Measurement of isolated-prompt photon–hadron correlations in Pb–Pb collisions at $$\sqrt{{s}_{{\textrm{NN}}}} = 5.02$$ TeV

K. Barth, N. Agrawal, I. G. Bearden, A. Augustinus, Y. W. Baek, S. Arcelli, A. Bhasin, I. Altsybeev, A. Andronic, Bushra Ali, S. Ahmad, M. Arslandok, L. Betev, T. Alt, Partha Pratim Bhaduri, E. Barreau, F. Antinori, R. Bellwied, G. Batigne, L. Bianchi, Renu Bala, F. Bellini, J. Bielčík, J. Bielčíková, M. D. Azmi, I. Ahuja, G. Aglieri Rinella, A. R. Alfarasyi, L. S. Barnby, M. Al-Turany, Y. Bailung, Bartosz Baliś, B. Bhattacharjee, D. Behera, N. Apadula, V. Anguelov, L. G. E. Beltran, A. Bilandzic, C. Arata, H. Appelshäuser, B. Alessandro, R. Averbeck, Massimo Angeletti, Kshitij Agarwal, G. Bencédi, N. Bastid, D. Battistini, Byungyun Kong, A. Berdnikova, R. Arnaldi, A. Alici, Valentina Akishina, Alberto Baldisseri, X. Bai, L. Bergmann, L. Barreto, G. Alocco, I. Belikov, R. Bailhache, Z. Ahammed, S. Beolè, Joonsuk Bae, N. Andreou, Yael Antonio Vásquez Beltran, Luca Aglietta, Veronika Barbasová, P. Antonioli, I. C. Arsene, Banajit Barman, A. Badalà, Valerie Ramillien Barret, E. Bartsch, B. Batyunya, S. Acharya, F. Barile, J. Alme, G. G. Barnaföldi, L. Barioglio, Y. Bae, R. Alfaro Molina, C. Andrei, T. N. BHALLA, M. Barlou, J. L. Bazo Alba, Anna Binoy, Lorenzo Bernardinis, Ibrahim Jaser Abualrob, Valerio Di Bella, L. Baudino, S. Behera, M. A. C. Behling, O. Benchikhi, D. A. H. Abdallah, S. Bangalia, A. Bensaoula, H. Baba, D. Bauri, K. Barai, A. R. J. Babu, Z. Akbar
article en

Abstract

Abstract The ALICE Collaboration has measured the azimuthal correlation between trigger isolated-prompt photons and associated charged hadrons in Pb–Pb collisions at the CERN LHC, at a centre-of-mass energy per nucleon pair of $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ s NN = 5.02 TeV. The trigger isolated-prompt photons are measured in the transverse-momentum range $$18 18 < p T γ < 40 GeV/ c and pseudorapidity range $$|\eta ^{\gamma }| <0.67$$ | η γ | < 0.67 . The isolation selection is based on a charged particle isolation momentum threshold $$p_{\textrm{T}}^{\mathrm{iso,\,ch}} = 1.5$$ p T iso , ch = 1.5 GeV/ c within a cone of radius $$R=0.2$$ R = 0.2 . The associated charged particles are measured in the transverse-momentum ranges $$p_{\textrm{T}}^{\textrm{h}} > 1.8$$ p T h > 1.8 GeV/ c and pseudorapidity $$|\eta ^{{\textrm{h}}}| <0.9$$ | η h | < 0.9 . The yield D( $$z_{\textrm{T}}$$ z T ) of associated hadrons per trigger, with $$z_{\textrm{T}} = p_{\textrm{T}}^{{\textrm{h}}}/p_{\textrm{T}}^{\gamma }$$ z T = p T h / p T γ , is measured in three Pb–Pb collision centrality classes: central (0–30%), semicentral (30–50%), and peripheral (50–90%). The D( $$z_{\textrm{T}}$$ z T

The European Physical Journal CVol. 86(9)
Goethe University Frankfurt (DE), University of Copenhagen (DK), University of Science and Technology of China (CN), Centre National de la Recherche Scientifique (FR), Gauhati University (IN), University of Jammu (IN), University of Kansas (US), Lawrence Berkeley National Laboratory (US), Istituto Nazionale di Fisica Nucleare (IT), Indian Institute of Technology Bombay (IN), GSI Helmholtz Centre for Heavy Ion Research (DE), Aligarh Muslim University (IN), Universidade de São Paulo (BR), University of Oslo (NO), Wayne State University (US), Universidad Autónoma de Sinaloa (MX), Université Clermont Auvergne (FR), Homi Bhabha National Institute (IN), Université de Lyon (FR), University of Pavol Jozef Šafárik (SK), University of Derby (GB), Heidelberg University (DE), University of Münster (DE), Fondazione Bruno Kessler (IT), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), CEA Paris-Saclay - Etablissement de Saclay (FR), Institut Pluridisciplinaire Hubert Curien (FR), Yale University (US), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Laboratoire de Physique Subatomique et des Technologies Associées (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT), HUN-REN Wigner Research Centre for Physics (HU), IMT Atlantique (FR), Institut National de Physique Nucléaire et de Physique des Particules (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Czech Academy of Sciences, Nuclear Physics Institute (CZ), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), National Research and Innovation Agency (ID), Institut de Physique des 2 Infinis de Lyon (FR), University of Bergen (NO), University of Houston (US), Czech Technical University in Prague (CZ), Panjab University (IN), Technical University of Munich (DE), Indian Institute of Technology Indore (IN), Pontificia Universidad Católica del Perú (PE), European Organization for Nuclear Research (CH), AGH University of Krakow (PL), Université de Strasbourg (FR), Benemérita Universidad Autónoma de Puebla (MX), The University of Tokyo (JP), Suranaree University of Technology (TH), Sungkyunkwan University (KR), Korea Institute of Science & Technology Information (KR), Universidad Nacional Autónoma de México (MX), Université Grenoble Alpes (FR), Nantes Université (FR)
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