Measurement of the inclusive isolated-photon production cross section in pp and Pb–Pb collisions at $$\mathbf {\sqrt{\textit{s}_{NN }} = 5.02}$$ TeV

Abstract The ALICE Collaboration at the CERN LHC has measured the inclusive production cross section of isolated photons at midrapidity as a function of the photon transverse momentum ( $$p_{\textrm{T}}^{\gamma }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:msubsup> </mml:math> ), in Pb–Pb collisions in different centrality intervals, and in pp collisions, at centre-of-momentum energy per nucleon pair of $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mspace/> <mml:mo>=</mml:mo> <mml:mspace/> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV. The photon transverse momentum range is between 10–14 and 40–140 GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> , depending on the collision system and on the Pb–Pb centrality class. The result extends to lower $$p_{\textrm{T}}^{\gamma }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:msubsup> </mml:math> than previously published results by the ATLAS and CMS experiments at the same collision energy. The covered pseudorapidity range is $$|\eta ^{\gamma } | &lt;0.67$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msup> <mml:mi>η</mml:mi> <mml:mi>γ</mml:mi> </mml:msup> <mml:mrow> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>0.67</mml:mn> </mml:mrow> </mml:mrow> </mml:math> . The isolation selection is based on a charged particle isolation momentum threshold $$p_{\textrm{T}}^\mathrm{iso,~ch} = 1.5$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> </mml:mrow> <mml:mrow> <mml:mi>iso</mml:mi> <mml:mo>,</mml:mo> <mml:mspace/> <mml:mi>ch</mml:mi> </mml:mrow> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mn>1.5</mml:mn> </mml:mrow> </mml:math> GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> within a cone of radii $$R=0.2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.2</mml:mn> </mml:mrow> </mml:math> and 0.4. The nuclear modification factor is calculated and found to be consistent with unity in all centrality classes, and also consistent with the HG-PYTHIA model, which describes the event selection and geometry biases that affect the centrality determination in peripheral Pb–Pb collisions. The measurement is compared to next-to-leading order perturbative QCD calculations and to the measurements of isolated photons and Z $$^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mn>0</mml:mn> </mml:mmultiscripts> </mml:math> bosons from the CMS experiment, which are all found to be in agreement.

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The European Physical Journal C
Published
2025-05-19
DOI
https://doi.org/10.1140/epjc/s10052-025-13971-y
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2
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High-Energy Particle Collisions Research
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article
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3.74

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article

Measurement of the inclusive isolated-photon production cross section in pp and Pb–Pb collisions at $$\mathbf {\sqrt{\textit{s}_{NN }} = 5.02}$$ TeV

F. Ronchetti, L. Lautner, I. Chakaberia, K. Barth et al.
2 citations
The European Physical Journal C
High-Energy Particle Collisions Research
3.74
article

Measurement of the inclusive isolated-photon production cross section in pp and Pb–Pb collisions at $$\mathbf {\sqrt{\textit{s}_{NN }} = 5.02}$$ TeV

F. Ronchetti, L. Lautner, I. Chakaberia, K. Barth, Adrian Horzyk, N. Rubini, S. Y. Noh, M. Germain, E. López Torres, C. Lippmann, B. Jacak, P. Gasik, M. Guilbaud, Md Samsul Islam, A. Yuncu, K. Schweda, F. Manso, A. Manea, J. G. Contreras, M. Mazzilli, N. Agrawal, C. Kim, M. N. Anaam, M. Gagliardi, Felix Willi Hoffmann, I.-K. Yoo, I. G. Bearden, B. Paul, Manuel Viqueira Rodriguez, G. Luparello, A. Dubla, W. Guo, T. Virgili, B. Polichtchouk, R. Turrisi, D. Hatzifotiadou, F. Cindolo, R. Rath, Artem Kotliarov, Y. Kwon, H. Buesching, K. Røed, G. De Cataldo, D. Ruggiano, I. Selyuzhenkov, S. Thakur, Martin Andreas Volkl, V. Kučera, S. R. Klein, I. Fokin, Tonatiuh García Chàvez, A. Shangaraev, A. Grelli, T. Bodova, M. V. Hartung, D. Røhr, A. Augustinus, C. Andrei, Y. W. Baek, A. Margotti, S. Arcelli, A. Bhasin, M. Sitta, C. Markert, I. Altsybeev, T. Tkacik, T. Siemiarczuk, M. M. Czarnynoga, A. Andronic, Giulia Gioachin, M. Agnello, G. L. Usaı́, A. Nyanin, R. Divià, B. Ulukutlu, Bushra Ali, J. Castillo Castellanos, M. Planinić, A. Rakotozafindrabe, C. Terrevoli, J. Schukraft, Emma Rose Yeats, A. Tavira García, Gianni Shigeru Setoue Liveraro, V. Nikulin, R. Lietava, Y. Sekiguchi, A. Morsch, M. B. Gay Ducati, A. Vodopyanov, K. Gwizdziel, V. Zaccolo, E. Grecka, D. Röhrich, R. Lavicka, E. García-Solis, Siyu Tang, F. Soramel, Mihaela Gabriela Besoiu, J. Wilkinson, P. Chochula, A. Kalweit, S. A. Bysiak, Jesús Ricardo Alvarado García, Pritam Chakraborty, Konstantin Mikhaylov, J. W. Myrcha, S. Ahmad, H. M. Alfanda, Z. Banoo, Mihai Carabaș, M. Arslandok, T. Fusayasu, W. Deng, S. Saha, S. Das, K. E. Iversen, C. Wang, F. Mazzaschi, D. Mallick, B. Sitár, I. Ravasenga, C. Ferrero, A. Sturniolo, Corentin Cot, M. Bombara, Guido Alexander Willems, A. Harton, Olaf Massen, F. Grosa, A. Hutson, A. Trifirò, L. Betev, T. Alt, Ernst Hellbär, D. Colella, A. Rai, F. Colamaria, M. Chen, S. Grigoryan, C. Sonnabend, Nicolas Schmidt, R. J. G. van Weelden, Justin Thomas Blair, E. 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Peitzmann, Mingyang Li, Sadhana Dash, L. Zhang
article en
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Abstract

Abstract The ALICE Collaboration at the CERN LHC has measured the inclusive production cross section of isolated photons at midrapidity as a function of the photon transverse momentum ( $$p_{\textrm{T}}^{\gamma }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:msubsup> </mml:math> ), in Pb–Pb collisions in different centrality intervals, and in pp collisions, at centre-of-momentum energy per nucleon pair of $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mspace/> <mml:mo>=</mml:mo> <mml:mspace/> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV. The photon transverse momentum range is between 10–14 and 40–140 GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> , depending on the collision system and on the Pb–Pb centrality class. The result extends to lower $$p_{\textrm{T}}^{\gamma }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:msubsup> </mml:math> than previously published results by the ATLAS and CMS experiments at the same collision energy. The covered pseudorapidity range is $$|\eta ^{\gamma } | &lt;0.67$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msup> <mml:mi>η</mml:mi> <mml:mi>γ</mml:mi> </mml:msup> <mml:mrow> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>0.67</mml:mn> </mml:mrow> </mml:mrow> </mml:math> . The isolation selection is based on a charged particle isolation momentum threshold $$p_{\textrm{T}}^\mathrm{iso,~ch} = 1.5$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mtext>T</mml:mtext> </mml:mrow> <mml:mrow> <mml:mi>iso</mml:mi> <mml:mo>,</mml:mo> <mml:mspace/> <mml:mi>ch</mml:mi> </mml:mrow> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mn>1.5</mml:mn> </mml:mrow> </mml:math> GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> within a cone of radii $$R=0.2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.2</mml:mn> </mml:mrow> </mml:math> and 0.4. The nuclear modification factor is calculated and found to be consistent with unity in all centrality classes, and also consistent with the HG-PYTHIA model, which describes the event selection and geometry biases that affect the centrality determination in peripheral Pb–Pb collisions. The measurement is compared to next-to-leading order perturbative QCD calculations and to the measurements of isolated photons and Z $$^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mn>0</mml:mn> </mml:mmultiscripts> </mml:math> bosons from the CMS experiment, which are all found to be in agreement.

The European Physical Journal CVol. 85(5)
Université Claude Bernard Lyon 1 (FR), University of Foggia (IT), Warsaw University of Technology (PL), National Agency for New Technologies, Energy and Sustainable Economic Development (IT), University of Messina (IT), Hiroshima University (JP), Goethe University Frankfurt (DE), Creighton University (US), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), University of Copenhagen (DK), University of Science and Technology of China (CN), Jagiellonian University (PL), Oak Ridge National Laboratory (US), Centre National de la Recherche Scientifique (FR), Universidade Federal do Rio Grande do Sul (BR), A. Alikhanyan National Laboratory (AM), Gangneung–Wonju National University (KR), Berkeley College (US), University of Bonn (DE), Gauhati University (IN), University of Jammu (IN), University of Tsukuba (JP), University of Kansas (US), University of Liverpool (GB), National Academy of Sciences of Ukraine (UA), California Polytechnic State University (US), University of Cape Town (ZA), Indian Institute of Technology Bombay (IN), National Institute of Science Education and Research (IN), Chungbuk National University (KR), GSI Helmholtz Centre for Heavy Ion Research (DE), Aligarh Muslim University (IN), Saga University (JP), Politecnico di Torino (IT), Western Norway University of Applied Sciences (NO), University of Zagreb (HR), Universidade Estadual de Campinas (UNICAMP) (BR), Technical University of Košice (SK), University of Oslo (NO), Wayne State University (US), Lund University (SE), Nagasaki Institute of Applied Science (JP), Inha University (KR), University of the Witwatersrand (ZA), Utrecht University (NL), Yonsei University (KR), Universidad Autónoma de Sinaloa (MX), Homi Bhabha National Institute (IN), National and Kapodistrian University of Athens (GR), University of Pavol Jozef Šafárik (SK), Slovak Academy of Sciences (SK), University of Wrocław (PL), University of Derby (GB), Heidelberg University (DE), Fudan University (CN), University of Pavia (IT), Helsinki Institute of Physics (FI), University of South-Eastern Norway (NO), Daresbury Laboratory (GB), University of California System (US), Sejong University (KR), China University of Geosciences (CN), Yale University (US), Central China Normal University (CN), Yıldız Technical University (TR), Max Planck Institute for Physics (DE), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), National Institute for Subatomic Physics (NL), China Institute of Atomic Energy (CN), National Centre for Nuclear Research (PL), Institut de Physique (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Pavia (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), HUN-REN Wigner Research Centre for Physics (HU), Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (IT), National Nuclear Research Center (AZ), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), South Great Plain Regional Innovation Agency (HU), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Hospital Universitário da Universidade de São Paulo (BR), Institute of Space Science - INFLPR Subsidiary (RO), 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), Stefan Meyer Institute for Subatomic Physics (AT), Max Planck Institute for Nuclear Physics (DE), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CU), Gesellschaft Fur Mathematik Und Datenverarbeitung (DE), National Research and Innovation Agency (ID), University of Bergen (NO), University of Houston (US), Czech Technical University in Prague (CZ), Pusan National University (KR), Panjab University (IN), The Ohio State University (US), Universitatea Națională de Știință și Tehnologie Politehnica București (RO), Technical University of Munich (DE), Indian Institute of Technology Indore (IN), Pontificia Universidad Católica del Perú (PE), European Organization for Nuclear Research (CH), Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (MX), AGH University of Krakow (PL), Polytechnic University of Bari (IT), Université de Strasbourg (FR), Universidade Federal do ABC (BR), Benemérita Universidad Autónoma de Puebla (MX), Chicago State University (US), Comenius University Bratislava (SK), The University of Tokyo (JP), University of Tennessee at Knoxville (US), University of Birmingham (GB), University of Brescia (IT), Jeonbuk National University (KR), University of Tübingen (DE), Suranaree University of Technology (TH), Sungkyunkwan University (KR), The University of Texas at Austin (US), Korea Institute of Science & Technology Information (KR), Universidad Nacional Autónoma de México (MX), Université Grenoble Alpes (FR), University of Split (HR), University of Jyväskylä (FI), Nara Women's University (JP), Polish Academy of Sciences (PL)
National Science Foundation, U.S. Department of Energy, Villum Fonden, Ministry of Education and Science, CERN, Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, Badan Riset dan Inovasi Nasional, European Commission, National Research Foundation, Department of Science and Technology, Ministry of Science and Technology, India, Council of Scientific and Industrial Research, India, University Grants Commission, Ministry of Education, Culture, Sports, Science and Technology, Danmarks Grundforskningsfond, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Österreichischen Akademie der Wissenschaften, Grantová Agentura České Republiky, Ministry of Education of the People's Republic of China, Bundesministerium für Bildung und Forschung, Austrian Science Fund, Consejo Nacional de Ciencia y Tecnología, Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, General Secretariat for Research and Technology, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Korea Institute of Science and Technology, Korea Institute of Science and Technology Information, National Research Foundation of Korea, National Science and Technology Development Agency, Suranaree University of Technology, Vetenskapsrådet, Hrvatska Zaklada za Znanost, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Danmarks Frie Forskningsfond, Universidade Federal do Rio Grande do Sul, Norges Forskningsråd, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, State Committee of Science, Fondo de Cooperación Internacional en Ciencia y Tecnología, Pontificia Universidad Católica del Perú, Istituto Nazionale di Fisica Nucleare, Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, GSI Helmholtzzentrum für Schwerionenforschung, Institut National de Physique Nucléaire et de Physique des Particules, National Research, Development and Innovation Office, Nuclear Physics, FP7 International Cooperation
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High-Energy Particle Collisions Research
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