Open Access

Measurement of $π^{0}$ -hadron correlations relative to the event plane in semicentral Pb-Pb collisions at $\sqrt{s_{N N}} = 5.02$ TeV

D. A. H. Abdallah ¹³⁴, I. J. Abualrob ¹¹², S. Acharya ⁴⁹, K. Agarwal ^23,*, G. Aglieri Rinella ³², L. Aglietta ²⁴, N. Agrawal ²⁵, Z. Ahammed ¹³², S. Ahmad ¹⁵ et al. (ALICE Collaboration)

S. Ahmad ¹⁵, I. Ahuja ³⁶, Z. Akbar⁷⁹, V. Akishina ³⁸, M. Al-Turany ⁹⁴, B. Alessandro ⁵⁵, R. Alfaro Molina ⁶⁶, B. Ali ¹⁵, A. Alici ^25,†, J. Alme ²⁰, G. Alocco ²⁴, T. Alt ⁶³, I. Altsybeev ⁹², C. Andrei ⁴⁴, N. Andreou ¹¹¹, A. Andronic ¹²³, M. Angeletti ³², V. Anguelov ⁹¹, F. Antinori ⁵³, P. Antonioli ⁵⁰, N. Apadula ⁷¹, H. Appelshäuser ⁶³, S. Arcelli ^25,†, R. Arnaldi ⁵⁵, I. C. Arsene ¹⁹, M. Arslandok ¹³⁵, A. Augustinus ³², R. Averbeck ⁹⁴, M. D. Azmi ¹⁵, H. Baba¹²¹, A. R. J. Babu¹³⁴, A. Badalà ⁵², J. Bae ¹⁰⁰, Y. Bae ¹⁰⁰, Y. W. Baek ¹⁰⁰, X. Bai ¹¹⁶, R. Bailhache ⁶³, Y. Bailung ¹²⁵, R. Bala ⁸⁸, A. Baldisseri ¹²⁷, B. Balis ², S. Bangalia ¹¹⁴, Z. Banoo ⁸⁸, V. Barbasova ³⁶, F. Barile ³¹, L. Barioglio ⁵⁵, M. Barlou ²⁴, B. Barman ⁴⁰, G. G. Barnaföldi ⁴⁵, L. S. Barnby ¹¹¹, E. Barreau ⁹⁹, V. Barret ¹²⁴, L. Barreto ¹⁰⁶, K. Barth ³², E. Bartsch ⁶³, N. Bastid ¹²⁴, G. Batigne ⁹⁹, D. Battistini ^34,92, B. Batyunya ¹³⁹, L. Baudino ^24,‡, D. Bauri⁴⁶, J. L. Bazo Alba ⁹⁸, I. G. Bearden ⁸⁰, P. Becht ⁹⁴, D. Behera ^47,77, S. Behera ⁴⁶, M. A. C. Behling ⁶³, I. Belikov ¹²⁶, V. D. Bella ¹²⁶, F. Bellini ²⁵, R. Bellwied ¹¹², L. G. E. Beltran ¹⁰⁵, Y. A. V. Beltran ⁴³, G. Bencedi ⁴⁵, O. Benchikhi ⁷³, A. Bensaoula¹¹², S. Beole ²⁴, A. Berdnikova ⁹¹, L. Bergmann ⁷¹, L. Bernardinis ²³, L. Betev ³², P. P. Bhaduri ¹³², T. Bhalla ⁸⁷, A. Bhasin ⁸⁸, B. Bhattacharjee ⁴⁰, L. Bianchi ²⁴, J. Bielčík ³⁴, J. Bielčíková ⁸³, A. Bilandzic ⁹², A. Binoy ¹¹⁴, G. Biro ⁴⁵, S. Biswas ⁴, M. B. Blidaru ⁹⁴, N. Bluhme ³⁸, C. Blume ⁶³, F. Bock ⁸⁴, T. Bodova ²⁰, L. Boldizsár ⁴⁵, M. Bombara ³⁶, P. M. Bond ³², G. Bonomi ^131,54, H. Borel ¹²⁷, A. Borissov ¹³⁹, A. G. Borquez Carcamo ⁹¹, E. Botta ²⁴, N. Bouchhar ¹⁷, Y. E. M. Bouziani ⁶³, D. C. Brandibur ⁶², L. Bratrud ⁶³, P. Braun-Munzinger ⁹⁴, M. Bregant ¹⁰⁶, M. Broz ³⁴, G. E. Bruno ^31,93, V. D. Buchakchiev ³⁵, M. D. Buckland ⁸², H. Buesching ⁶³, S. Bufalino ²⁹, P. Buhler ⁷³, N. Burmasov ¹³⁹, Z. Buthelezi ^67,120, A. Bylinkin ²⁰, J. C. Cabanillas Noris ¹⁰⁵, M. F. T. Cabrera ¹¹², H. Caines ¹³⁵, A. Caliva ²⁸, E. Calvo Villar ⁹⁸, J. M. M. Camacho ¹⁰⁵, P. Camerini ²³, M. T. Camerlingo ⁴⁹, F. D. M. Canedo ¹⁰⁶, S. Cannito ²³, S. L. Cantway ¹³⁵, M. Carabas ¹⁰⁹, F. Carnesecchi ³², C. Carr ⁹⁷, L. A. D. Carvalho ¹⁰⁶, J. Castillo Castellanos ¹²⁷, M. Castoldi ³², F. Catalano ¹¹², S. Cattaruzzi ²³, R. Cerri ²⁴, I. Chakaberia ⁷¹, P. Chakraborty ¹³³, J. W. O. Chan¹¹², S. Chandra ¹³², S. Chapeland ³², M. Chartier ¹¹⁵, S. Chattopadhay¹³², M. Chen ³⁹, T. Cheng ⁶, M. I. Cherciu ⁶², C. Cheshkov ¹²⁵, D. Chiappara ²⁷, V. Chibante Barroso ³², D. D. Chinellato ⁷³, F. Chinu ²⁴, E. S. Chizzali ^92,§, J. Cho ⁵⁷, S. Cho ⁵⁷, P. Chochula ³², Z. A. Chochulska ^133,∥, P. Christakoglou ⁸¹, P. Christiansen ⁷², T. Chujo ¹²², B. Chytla ¹³³, M. Ciacco ²⁴, C. Cicalo ⁵¹, G. Cimador ^32,24, F. Cindolo ⁵⁰, F. Colamaria ⁴⁹, D. Colella ³¹, A. Colelli ³¹, M. Colocci ²⁵, M. Concas ³², G. Conesa Balbastre ⁷⁰, Z. Conesa del Valle ¹²⁸, G. Contin ²³, J. G. Contreras ³⁴, M. L. Coquet ⁹⁹, P. Cortese ^130,55, M. R. Cosentino ¹⁰⁸, F. Costa ³², S. Costanza ²¹, P. Crochet ¹²⁴, M. M. Czarnynoga¹³³, A. Dainese ⁵³, E. Dall'occo³², G. Dange³⁸, M. C. Danisch ¹⁶, A. Danu ⁶², A. Daribayeva³⁸, P. Das ³², S. Das ⁴, A. R. Dash ¹²³, S. Dash ⁴⁶, A. De Caro ²⁸, G. de Cataldo ⁴⁹, J. de Cuveland ³⁸, A. De Falco ²², D. De Gruttola ²⁸, N. De Marco ⁵⁵, C. De Martin ²³, S. De Pasquale ²⁸, R. Deb ¹³¹, R. Del Grande ³⁴, L. Dello Stritto ³², G. G. A. de Souza ^106,¶, P. Dhankher ¹⁸, D. Di Bari ³¹, M. Di Costanzo ²⁹, A. Di Mauro ³², B. Di Ruzza ^129,49,†, B. Diab ³², Y. Ding ⁶, J. Ditzel ⁶³, R. Divià ³², U. Dmitrieva ⁵⁵, A. Dobrin ⁶², B. Dönigus ⁶³, L. Döpper ⁴¹, L. Drzensla², J. M. Dubinski ¹³³, A. Dubla ⁹⁴, P. Dupieux ¹²⁴, N. Dzalaiova¹³, T. M. Eder ¹²³, E. C. Ege ⁶³, R. J. Ehlers ⁷¹, F. Eisenhut ⁶³, R. Ejima ⁸⁹, D. Elia ⁴⁹, B. Erazmus ⁹⁹, F. Ercolessi ²⁵, B. Espagnon ¹²⁸, G. Eulisse ³², D. Evans ⁹⁷, L. Fabbietti ⁹², G. Fabbri ⁵⁰, M. Faggin ³², J. Faivre ⁷⁰, W. Fan ¹¹², T. Fang ⁶, A. Fantoni ⁴⁸, A. Feliciello ⁵⁵, W. Feng ⁶, A. Fernández Téllez ⁴³, B. Fernando¹³⁴, L. Ferrandi ¹⁰⁶, A. Ferrero ¹²⁷, C. Ferrero ^55,**, A. Ferretti ²⁴, D. Finogeev ¹³⁹, F. M. Fionda ⁵¹, A. N. Flores ¹⁰⁴, S. Foertsch ⁶⁷, I. Fokin ⁹¹, U. Follo ^55,**, R. Forynski ¹¹¹, E. Fragiacomo ⁵⁶, H. Fribert ⁹², U. Fuchs ³², D. Fuligno ²³, N. Funicello ²⁸, C. Furget ⁷⁰, A. Furs ¹³⁹, T. Fusayasu ⁹⁵, J. J. Gaardhøje ⁸⁰, M. Gagliardi ²⁴, A. M. Gago ⁹⁸, T. Gahlaut ⁴⁶, C. D. Galvan ¹⁰⁵, S. Gami ⁷⁷, C. Garabatos ⁹⁴, J. M. Garcia ⁴³, E. Garcia-Solis ⁹, S. Garetti ¹²⁸, C. Gargiulo ³², P. Gasik ⁹⁴, A. Gautam ¹¹⁴, M. B. Gay Ducati ⁶⁵, M. Germain ⁹⁹, R. A. Gernhaeuser ⁹², M. Giacalone ³², G. Gioachin ²⁹, S. K. Giri ¹³², P. Giubellino ⁵⁵, P. Giubilato ²⁷, P. Glässel ⁹¹, E. Glimos ¹¹⁹, M. G. F. S. A. Gomes ⁹¹, L. Gonella ²³, V. Gonzalez ¹³⁴, M. Gorgon ², K. Goswami ⁴⁷, S. Gotovac ³³, V. Grabski ⁶⁶, L. K. Graczykowski ¹³³, E. Grecka ⁸³, A. Grelli ⁵⁸, C. Grigoras ³², S. Grigoryan ^1,139, O. S. Groettvik ³², M. Gronbeck⁴¹, F. Grosa ³², S. Gross-Bölting ⁹⁴, J. F. Grosse-Oetringhaus ³², R. Grosso ⁹⁴, D. Grund ³⁴, N. A. Grunwald ⁹¹, R. Guernane ⁷⁰, M. Guilbaud ⁹⁹, K. Gulbrandsen ⁸⁰, J. K. Gumprecht ⁷³, T. Gündem ⁶³, T. Gunji ¹²¹, J. Guo¹⁰, W. Guo ⁶, A. Gupta ⁸⁸, R. Gupta ⁸⁸, R. Gupta ⁴⁷, K. Gwizdziel ¹³³, L. Gyulai ⁴⁵, T. Hachiya ⁷⁵, C. Hadjidakis ¹²⁸, F. U. Haider ⁸⁸, S. Haidlova ³⁴, M. Haldar⁴, W. Ham ¹⁰⁰, H. Hamagaki ⁷⁴, Y. Han ¹³⁷, R. Hannigan ¹⁰⁴, J. Hansen ⁷², J. W. Harris ¹³⁵, A. Harton ⁹, M. V. Hartung ⁶³, A. Hasan ¹¹⁸, H. Hassan ¹¹³, D. Hatzifotiadou ⁵⁰, P. Hauer ⁴¹, L. B. Havener ¹³⁵, E. Hellbär ³², H. Helstrup ³⁷, M. Hemmer ⁶³, S. G. Hernandez¹¹², G. Herrera Corral ⁸, K. F. Hetland ³⁷, B. Heybeck ⁶³, H. Hillemanns ³², B. Hippolyte ¹²⁶, I. P. M. Hobus ⁸¹, F. W. Hoffmann ³⁸, B. Hofman ⁵⁸, Y. Hong⁵⁷, A. Horzyk ², Y. Hou ^11,94, P. Hristov ³², L. M. Huhta ¹¹³, T. J. Humanic ⁸⁵, V. Humlova ³⁴, M. Husar ⁸⁶, A. Hutson ¹¹², D. Hutter ³⁸, M. C. Hwang ¹⁸, M. Inaba ¹²², A. Isakov ⁸¹, T. Isidori ¹¹⁴, M. S. Islam ⁴⁶, M. Ivanov ⁹⁴, M. Ivanov¹³, K. E. Iversen ⁷², M. Jablonski ², B. Jacak ^18,71, N. Jacazio ²⁵, P. M. Jacobs ⁷¹, A. Jadlovska¹⁰², S. Jadlovska¹⁰², S. Jaelani ⁷⁹, J. N. Jager ⁶³, C. Jahnke ¹⁰⁷, M. J. Jakubowska ¹³³, E. P. Jamro ², D. M. Janik ³⁴, M. A. Janik ¹³³, C. A. Jauch ⁹⁴, S. Ji ¹⁶, Y. Ji ⁹⁴, S. Jia ⁸⁰, T. Jiang ¹⁰, A. A. P. Jimenez ⁶⁴, S. Jin¹⁰, F. Jonas ⁷¹, D. M. Jones ¹¹⁵, J. M. Jowett ^32,94, J. Jung ⁶³, M. Jung ⁶³, A. Junique ³², J. Juračka ³⁴, J. Kaewjai ^101,115, A. Kaiser ^32,94, P. Kalinak ⁵⁹, A. Kalweit ³², H. Kang¹², A. Karasu Uysal ¹³⁶, N. Karatzenis⁹⁷, T. Karavicheva ¹³⁹, M. J. Karwowska ¹³³, V. Kashyap ⁷⁷, M. Keil ³², B. Ketzer ⁴¹, J. Keul ⁶³, S. S. Khade ⁴⁷, A. Khuntia ⁵⁰, Z. Khuranova ⁶³, B. Kileng ³⁷, B. Kim ¹⁰⁰, D. J. Kim ¹¹³, D. Kim ¹⁰⁰, E. J. Kim ⁶⁸, G. Kim ⁵⁷, H. Kim ⁵⁷, J. Kim ¹³⁷, J. Kim ⁵⁷, J. Kim ¹³⁷, J. Kim ³², M. Kim ¹⁸, S. Kim ¹⁷, T. Kim ¹³⁷, J. T. Kinner ¹²³, I. Kisel ³⁸, A. Kisiel ¹³³, J. L. Klay ⁵, J. Klein ³², S. Klein ⁷¹, C. Klein-Bösing ¹²³, M. Kleiner ⁶³, A. Kluge ³², M. B. Knuesel ¹³⁵, C. Kobdaj ¹⁰¹, R. Kohara ¹²¹, A. Kondratyev ¹³⁹, J. Konig ⁶³, P. J. Konopka ³², G. Kornakov ¹³³, M. Korwieser ⁹², C. Koster ⁸¹, A. Kotliarov ⁸³, N. Kovacic ⁸⁶, M. Kowalski ¹⁰³, V. Kozhuharov ³⁵, G. Kozlov ³⁸, I. Králik ⁵⁹, A. Kravčáková ³⁶, M. A. Krawczyk ³², L. Krcal ³², F. Krizek ⁸³, K. Krizkova Gajdosova ³⁴, C. Krug ⁶⁵, M. Krüger ⁶³, E. Kryshen ¹³⁹, V. Kučera ⁵⁷, C. Kuhn ¹²⁶, D. Kumar ¹³², L. Kumar ⁸⁷, N. Kumar ⁸⁷, S. Kumar ⁴⁹, S. Kundu ³², M. Kuo¹²², P. Kurashvili ⁷⁶, S. Kurita ⁸⁹, S. Kushpil ⁸³, A. Kuznetsov ¹³⁹, M. J. Kweon ⁵⁷, Y. Kwon ¹³⁷, S. L. La Pointe ³⁸, P. La Rocca ²⁶, A. Lakrathok¹⁰¹, S. Lambert ⁹⁹, A. R. Landou ⁷⁰, R. Langoy ¹¹⁸, P. Larionov ³², E. Laudi ³², L. Lautner ⁹², R. A. N. Laveaga ¹⁰⁵, R. Lavicka ⁷³, R. Lea ^131,54, J. B. Lebert ³⁸, H. Lee ¹⁰⁰, S. Lee⁵⁷, I. Legrand ⁴⁴, G. Legras ¹²³, A. M. Lejeune ³⁴, T. M. Lelek ², I. León Monzón ¹⁰⁵, M. M. Lesch ⁹², P. Lévai ⁴⁵, M. Li⁶, P. Li¹⁰, X. 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Shou ³⁹, S. Siddhanta ⁵¹, T. Siemiarczuk ⁷⁶, T. F. Silva ¹⁰⁶, W. D. Silva ¹⁰⁶, D. Silvermyr ⁷², T. Simantathammakul ¹⁰¹, R. Simeonov ³⁵, B. Singh ⁴⁶, B. Singh ⁸⁸, B. Singh ⁹², K. Singh ⁴⁷, R. Singh ⁷⁷, R. Singh ⁵³, S. Singh ¹⁵, T. Sinha ⁹⁶, B. Sitar ¹³, M. Sitta ^130,55, T. B. Skaali ¹⁹, G. Skorodumovs ⁹¹, N. Smirnov ¹³⁵, K. L. Smith ¹⁶, R. J. M. Snellings ⁵⁸, E. H. Solheim ¹⁹, S. Solokhin ⁸¹, C. Sonnabend ^32,94, J. M. Sonneveld ⁸¹, F. Soramel ²⁷, A. B. Soto-Hernandez ⁸⁵, R. Spijkers ⁸¹, C. Sporleder ¹¹³, I. Sputowska ¹⁰³, J. Staa ⁷², J. Stachel ⁹¹, L. L. Stahl ¹⁰⁶, I. Stan ⁶², A. G. Stejskal¹¹⁴, T. Stellhorn ¹²³, S. F. Stiefelmaier ⁹¹, D. Stocco ⁹⁹, I. Storehaug ¹⁹, N. J. Strangmann ⁶³, P. Stratmann ¹²³, S. Strazzi ²⁵, A. Sturniolo ^115,30,52, Y. Su⁶, A. A. P. Suaide ¹⁰⁶, C. Suire ¹²⁸, A. Suiu ¹⁰⁹, M. Sukhanov ¹³⁹, M. Suljic ³², V. Sumberia ⁸⁸, S. Sumowidagdo ⁷⁹, P. Sun¹⁰, N. B. Sundstrom ⁵⁸, L. H. Tabares ⁷, A. Tabikh ⁷⁰, S. F. Taghavi ⁹², J. Takahashi ¹⁰⁷, M. A. 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Zhang ⁹¹, C. Zhang ¹²⁷, M. Zhang ^124,6, M. Zhang ^27,6, S. Zhang ³⁹, X. Zhang ⁶, Y. Zhang¹¹⁶, Y. Zhang ¹¹⁶, Z. Zhang ⁶, D. Zhou ⁶, Y. Zhou ⁸⁰, Z. Zhou ³⁹, J. Zhu ³⁹, S. Zhu^94,116, Y. Zhu⁶, A. Zingaretti ²⁷, S. C. Zugravel ⁵⁵, and N. Zurlo ^131,54 (ALICE Collaboration)

¹A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia
²AGH University of Krakow, Cracow, Poland
³Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
⁴Bose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, India
⁵California Polytechnic State University, San Luis Obispo, California, USA
⁶Central China Normal University, Wuhan, China
⁷Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba
⁸Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico
⁹Chicago State University, Chicago, Illinois, USA
¹⁰China Nuclear Data Center, China Institute of Atomic Energy, Beijing, China
¹¹China University of Geosciences, Wuhan, China
¹²Chungbuk National University, Cheongju, Republic of Korea
¹³Comenius University Bratislava, Faculty of Mathematics, Physics and Informatics, Bratislava, Slovak Republic
¹⁴Creighton University, Omaha, Nebraska, USA
¹⁵Department of Physics, Aligarh Muslim University, Aligarh, India
¹⁶Department of Physics, Pusan National University, Pusan, Republic of Korea
¹⁷Department of Physics, Sejong University, Seoul, Republic of Korea
¹⁸Department of Physics, University of California, Berkeley, California, USA
¹⁹Department of Physics, University of Oslo, Oslo, Norway
²⁰Department of Physics and Technology, University of Bergen, Bergen, Norway
²¹Dipartimento di Fisica, Università di Pavia, Pavia, Italy
²²Dipartimento di Fisica dell'Università and Sezione INFN, Cagliari, Italy
²³Dipartimento di Fisica dell'Università and Sezione INFN, Trieste, Italy
²⁴Dipartimento di Fisica dell'Università and Sezione INFN, Turin, Italy
²⁵Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy
²⁶Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, Italy
²⁷Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Padova, Italy
²⁸Dipartimento di Fisica ‘E.R. Caianiello’ dell'Università and Gruppo Collegato INFN, Salerno, Italy
²⁹Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy
³⁰Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy
³¹Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy
³²European Organization for Nuclear Research (CERN), Geneva, Switzerland
³³Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia
³⁴Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
³⁵Faculty of Physics, Sofia University, Sofia, Bulgaria
³⁶Faculty of Science, P.J. Šafárik University, Košice, Slovak Republic
³⁷Faculty of Technology, Environmental and Social Sciences, Bergen, Norway
³⁸Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
³⁹Fudan University, Shanghai, China
⁴⁰Gauhati University, Department of Physics, Guwahati, India
⁴¹Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
⁴²Helsinki Institute of Physics (HIP), Helsinki, Finland
⁴³High Energy Physics Group, Universidad Autónoma de Puebla, Puebla, Mexico
⁴⁴Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
⁴⁵HUN-REN Wigner Research Centre for Physics, Budapest, Hungary
⁴⁶Indian Institute of Technology Bombay (IIT), Mumbai, India
⁴⁷Indian Institute of Technology Indore, Indore, India
⁴⁸INFN, Laboratori Nazionali di Frascati, Frascati, Italy
⁴⁹INFN, Sezione di Bari, Bari, Italy
⁵⁰INFN, Sezione di Bologna, Bologna, Italy
⁵¹INFN, Sezione di Cagliari, Cagliari, Italy
⁵²INFN, Sezione di Catania, Catania, Italy
⁵³INFN, Sezione di Padova, Padova, Italy
⁵⁴INFN, Sezione di Pavia, Pavia, Italy
⁵⁵INFN, Sezione di Torino, Turin, Italy
⁵⁶INFN, Sezione di Trieste, Trieste, Italy
⁵⁷Inha University, Incheon, Republic of Korea
⁵⁸Institute for Gravitational and Subatomic Physics (GRASP), Utrecht University/Nikhef, Utrecht, Netherlands
⁵⁹Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
⁶⁰Institute of Physics, Homi Bhabha National Institute, Bhubaneswar, India
⁶¹Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
⁶²Institute of Space Science (ISS), Bucharest, Romania
⁶³Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
⁶⁴Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico
⁶⁵Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
⁶⁶Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
⁶⁷iThemba LABS, National Research Foundation, Somerset West, South Africa
⁶⁸Jeonbuk National University, Jeonju, Republic of Korea
⁶⁹Korea Institute of Science and Technology Information, Daejeon, Republic of Korea
⁷⁰Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France
⁷¹Lawrence Berkeley National Laboratory, Berkeley, California, USA
⁷²Lund University Department of Physics, Division of Particle Physics, Lund, Sweden
⁷³Marietta Blau Institute, Vienna, Austria
⁷⁴Nagasaki Institute of Applied Science, Nagasaki, Japan
⁷⁵Nara Women's University (NWU), Nara, Japan
⁷⁶National Centre for Nuclear Research, Warsaw, Poland
⁷⁷National Institute of Science Education and Research, Homi Bhabha National Institute, Jatni, India
⁷⁸National Nuclear Research Center, Baku, Azerbaijan
⁷⁹National Research and Innovation Agency - BRIN, Jakarta, Indonesia
⁸⁰Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
⁸¹Nikhef, National institute for subatomic physics, Amsterdam, Netherlands
⁸²Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United Kingdom
⁸³Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic
⁸⁴Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
⁸⁵Ohio State University, Columbus, Ohio, USA
⁸⁶Physics department, Faculty of science, University of Zagreb, Zagreb, Croatia
⁸⁷Physics Department, Panjab University, Chandigarh, India
⁸⁸Physics Department, University of Jammu, Jammu, India
⁸⁹Physics Program and International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM²), Hiroshima University, Hiroshima, Japan
⁹⁰Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Tübingen, Germany
⁹¹Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
⁹²Physik Department, Technische Universität München, Munich, Germany
⁹³Politecnico di Bari and Sezione INFN, Bari, Italy
⁹⁴Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
⁹⁵Saga University, Saga, Japan
⁹⁶Saha Institute of Nuclear Physics, Homi Bhabha National Institute, Kolkata, India
⁹⁷School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁹⁸Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru
⁹⁹SUBATECH, IMT Atlantique, Nantes Université, CNRS-IN2P3, Nantes, France
¹⁰⁰Sungkyunkwan University, Suwon City, Republic of Korea
¹⁰¹Suranaree University of Technology, Nakhon Ratchasima, Thailand
¹⁰²Technical University of Košice, Košice, Slovak Republic
¹⁰³The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
¹⁰⁴The University of Texas at Austin, Austin, Texas, USA
¹⁰⁵Universidad Autónoma de Sinaloa, Culiacán, Mexico
¹⁰⁶Universidade de São Paulo (USP), São Paulo, Brazil
¹⁰⁷Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
¹⁰⁸Universidade Federal do ABC, Santo Andre, Brazil
¹⁰⁹Universitatea Nationala de Stiinta si Tehnologie Politehnica Bucuresti, Bucharest, Romania
¹¹⁰University of Cape Town, Cape Town, South Africa
¹¹¹University of Derby, Derby, United Kingdom
¹¹²University of Houston, Houston, Texas, USA
¹¹³University of Jyväskylä, Jyväskylä, Finland
¹¹⁴University of Kansas, Lawrence, Kansas, USA
¹¹⁵University of Liverpool, Liverpool, United Kingdom
¹¹⁶University of Science and Technology of China, Hefei, China
¹¹⁷University of Silesia in Katowice, Katowice, Poland
¹¹⁸University of South-Eastern Norway, Kongsberg, Norway
¹¹⁹University of Tennessee, Knoxville, Tennessee, USA
¹²⁰University of the Witwatersrand, Johannesburg, South Africa
¹²¹University of Tokyo, Tokyo, Japan
¹²²University of Tsukuba, Tsukuba, Japan
¹²³Universität Münster, Institut für Kernphysik, Münster, Germany
¹²⁴Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹²⁵Université de Lyon, CNRS/IN2P3, Institut de Physique des 2 Infinis de Lyon, Lyon, France
¹²⁶Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France, Strasbourg, France
¹²⁷Université Paris-Saclay, Centre d'Etudes de Saclay (CEA), IRFU, Départment de Physique Nucléaire (DPhN), Saclay, France
¹²⁸Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹²⁹Università degli Studi di Foggia, Foggia, Italy
¹³⁰Università del Piemonte Orientale, Vercelli, Italy
¹³¹Università di Brescia, Brescia, Italy
¹³²Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India
¹³³Warsaw University of Technology, Warsaw, Poland
¹³⁴Wayne State University, Detroit, Michigan, USA
¹³⁵Yale University, New Haven, Connecticut, USA
¹³⁶Yildiz Technical University, Istanbul, Turkey
¹³⁷Yonsei University, Seoul, Republic of Korea¹³⁸Affiliated with an institute formerly covered by a cooperation agreement with CERN
¹³⁹Affiliated with an international laboratory covered by a cooperation agreement with CERN

^*Also at INFN Trieste, Trieste, Italy.
^†Deceased.
^‡Also at Fondazione Bruno Kessler (FBK), Trento, Italy.
^§Also at Max-Planck-Institut fur Physik, Munich, Germany.
^∥Also at Czech Technical University in Prague, Prague, Czech Republic.
^¶Also at Instituto de Fisica da Universidade de São Paulo.
^**Also at Dipartimento DET del Politecnico di Torino, Turin, Italy.
^††Also at University College of Dublin, Dublin, Ireland.
^‡‡Also at Department of Applied Physics, Aligarh Muslim University, Aligarh, India.
^§§Also at Institute of Theoretical Physics, University of Wroclaw, Wroclaw, Poland.
^∥∥Also at Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City, Mexico.

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Phys. Rev. C 114, 024002 – Published 20 August, 2026

DOI: https://doi.org/10.1103/tqp4-kwrt

Abstract

Per-trigger yields of $π^{0} − hadron$ correlations were measured in semicentral Pb-Pb collisions at $\sqrt{s_{NN}} = 5.02 TeV$ in ALICE at the CERN Large Hadron Collider. The reconstructed $π^{0} \to γ γ$ , with a transverse momentum of $11 GeV / c < p_{T} (π^{0}) < 14 GeV / c$ , is used as the trigger particle to calculate yields of associated charged particles on the near- and away-side. The photons are reconstructed using the ALICE Electromagnetic Calorimeter, and the charged particles are measured in the ALICE central barrel within a pseudorapidity range of $| η | < 0.8$ . The yields are reported relative to the orientation of the $π^{0}$ with the second-order event plane and are background subtracted using the reaction-plane fit method. The data give an indication of a suppression of the associated charged-particle yields near $p_{T} \approx 2 GeV / c$ when comparing out-of-plane to in-plane trigger particles. At associated charged-particle $p_{T} > 3$ GeV/ $c$ , no significant event-plane dependence is observed within uncertainties. The results are compared with predictions from the JEWEL model, which implements jet energy loss in an expanding medium. JEWEL predicts no significant modification of either the near- or away-side associated yields, independent of whether medium recoils are included. The observed behavior may indicate the presence of additional energy-loss mechanisms beyond those governed by path-length dependence.

Physics Subject Headings (PhySH)

Article Text

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Phys. Rev. C 114, 024002– Published 20 August, 2026

Vol. 114, Iss. 2 — August 2026

Received 11 March 2026
Accepted 4 June 2026

DOI: https://doi.org/10.1103/tqp4-kwrt

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by CERN.

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Measurement of $π^{0}$ -hadron correlations relative to the event plane in semicentral Pb-Pb collisions at $\sqrt{s_{N N}} = 5.02$ TeV

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Measurement of π0-hadron correlations relative to the event plane in semicentral Pb-Pb collisions at sNN=5.02 TeV

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Measurement of $π^{0}$ -hadron correlations relative to the event plane in semicentral Pb-Pb collisions at $\sqrt{s_{N N}} = 5.02$ TeV