Open Access

Measurement of the angle between jet axes in Pb-Pb collisions at $\sqrt{s_{N N}} = 5.02$ TeV

S. Acharya ¹²⁶, D. Adamová ⁸⁷, A. Adler⁷⁰, G. Aglieri Rinella ³², M. Agnello ²⁹, N. Agrawal ⁵¹, Z. Ahammed ¹³⁴, S. Ahmad ¹⁵, S. U. Ahn ⁷¹ et al. (ALICE Collaboration)

S. U. Ahn ⁷¹, I. Ahuja ³⁶, A. Akindinov ¹⁴⁰, M. Al-Turany ⁹⁸, D. Aleksandrov ¹⁴⁰, B. Alessandro ⁵⁶, H. M. Alfanda ⁶, R. Alfaro Molina ⁶⁷, B. Ali ¹⁵, A. Alici ^25,a, N. Alizadehvandchali ¹¹⁵, A. Alkin ³², J. Alme ²⁰, G. Alocco ⁵², T. Alt ⁶⁴, I. Altsybeev ¹⁴⁰, J. R. Alvarado ⁴⁴, M. N. Anaam ⁶, C. Andrei ⁴⁵, A. Andronic ¹²⁵, V. Anguelov ⁹⁵, F. Antinori ⁵⁴, P. Antonioli ⁵¹, N. Apadula ⁷⁴, L. Aphecetche ¹⁰³, H. Appelshäuser ⁶⁴, C. Arata ⁷³, S. Arcelli ²⁵, M. Aresti ⁵², R. Arnaldi ⁵⁶, J. G. M. C. A. Arneiro ¹¹⁰, I. C. Arsene ¹⁹, M. Arslandok ¹³⁷, A. Augustinus ³², R. Averbeck ⁹⁸, M. D. Azmi ¹⁵, A. Badalà ⁵³, J. Bae ¹⁰⁴, Y. W. Baek ⁴⁰, X. Bai ¹¹⁹, R. Bailhache ⁶⁴, Y. Bailung ⁴⁸, A. Balbino ²⁹, A. Baldisseri ¹²⁹, B. Balis ², D. Banerjee ⁴, Z. Banoo ⁹², R. Barbera ²⁶, F. Barile ³¹, L. Barioglio ⁹⁶, M. Barlou ⁷⁹, G. G. Barnaföldi ⁴⁶, L. S. Barnby ⁸⁶, V. Barret ¹²⁶, L. Barreto ¹¹⁰, C. Bartels ¹¹⁸, K. Barth ³², E. Bartsch ⁶⁴, N. Bastid ¹²⁶, S. Basu ^75,a, G. Batigne ¹⁰³, D. Battistini ⁹⁶, B. Batyunya ¹⁴¹, D. Bauri⁴⁷, J. L. Bazo Alba ¹⁰², I. G. Bearden ⁸⁴, C. Beattie ¹³⁷, P. Becht ⁹⁸, D. Behera ⁴⁸, I. Belikov ¹²⁸, A. D. C. Bell Hechavarria ¹²⁵, F. Bellini ²⁵, R. Bellwied ¹¹⁵, S. Belokurova ¹⁴⁰, G. Bencedi ⁴⁶, S. Beole ²⁴, Y. Berdnikov ¹⁴⁰, A. Berdnikova ⁹⁵, L. Bergmann ⁹⁵, M. G. Besoiu ⁶³, L. Betev ³², P. P. Bhaduri ¹³⁴, A. Bhasin ⁹², M. A. Bhat ⁴, B. Bhattacharjee ⁴¹, L. Bianchi ²⁴, N. Bianchi ⁴⁹, J. Bielčík ³⁴, J. Bielčíková ⁸⁷, J. Biernat ¹⁰⁷, A. P. Bigot ¹²⁸, A. Bilandzic ⁹⁶, G. Biro ⁴⁶, S. Biswas ⁴, N. Bize ¹⁰³, J. T. Blair ¹⁰⁸, D. Blau ¹⁴⁰, M. B. Blidaru ⁹⁸, N. Bluhme ³⁸, C. Blume ⁶⁴, G. Boca ^21,55, F. Bock ⁸⁸, T. Bodova ²⁰, A. Bogdanov¹⁴⁰, S. Boi ²², J. Bok ⁵⁸, L. Boldizsár ⁴⁶, M. Bombara ³⁶, P. M. Bond ³², G. Bonomi ^133,55, H. Borel ¹²⁹, A. Borissov ¹⁴⁰, A. G. Borquez Carcamo ⁹⁵, H. Bossi ¹³⁷, E. Botta ²⁴, Y. E. M. Bouziani ⁶⁴, L. Bratrud ⁶⁴, P. Braun-Munzinger ⁹⁸, M. Bregant ¹¹⁰, M. Broz ³⁴, G. E. Bruno ^97,31, M. D. Buckland ²³, D. Budnikov ¹⁴⁰, H. Buesching ⁶⁴, S. Bufalino ²⁹, P. Buhler ⁷⁶, Z. Buthelezi ^68,122, A. Bylinkin ²⁰, S. A. Bysiak¹⁰⁷, M. Cai ⁶, H. Caines ¹³⁷, A. Caliva ²⁸, E. Calvo Villar ¹⁰², J. M. M. Camacho ¹⁰⁹, P. Camerini ²³, F. D. M. Canedo ¹¹⁰, S. L. Cantway ¹³⁷, M. Carabas ¹¹³, A. A. Carballo ³², F. Carnesecchi ³², R. Caron ¹²⁷, L. A. D. Carvalho ¹¹⁰, J. Castillo Castellanos ¹²⁹, F. Catalano ^32,24, C. Ceballos Sanchez ¹⁴¹, I. Chakaberia ⁷⁴, P. Chakraborty ⁴⁷, S. Chandra ¹³⁴, S. Chapeland ³², M. Chartier ¹¹⁸, S. Chattopadhyay ¹³⁴, S. Chattopadhyay ¹⁰⁰, T. Cheng ^98,6, C. Cheshkov ¹²⁷, B. Cheynis ¹²⁷, V. Chibante Barroso ³², D. D. Chinellato ¹¹¹, E. S. Chizzali ^96,b, J. Cho ⁵⁸, S. Cho ⁵⁸, P. Chochula ³², S. Choudhury¹⁰⁰, P. Christakoglou ⁸⁵, C. H. Christensen ⁸⁴, P. Christiansen ⁷⁵, T. Chujo ¹²⁴, M. Ciacco ²⁹, C. Cicalo ⁵², F. Cindolo ⁵¹, M. R. Ciupek⁹⁸, G. Clai^51,c, F. Colamaria ⁵⁰, J. S. Colburn¹⁰¹, D. Colella ^97,31, M. Colocci ²⁵, M. Concas ^56,138, G. Conesa Balbastre ⁷³, Z. Conesa del Valle ¹³⁰, G. Contin ²³, J. G. Contreras ³⁴, M. L. Coquet ¹²⁹, T. M. Cormier^88,a, P. Cortese ^132,56, M. R. Cosentino ¹¹², F. Costa ³², S. Costanza ^21,55, C. Cot ¹³⁰, J. Crkovská ⁹⁵, P. Crochet ¹²⁶, R. Cruz-Torres ⁷⁴, P. Cui ⁶, A. Dainese ⁵⁴, M. C. Danisch ⁹⁵, A. Danu ⁶³, P. Das ⁸¹, P. Das ⁴, S. Das ⁴, A. R. Dash ¹²⁵, S. Dash ⁴⁷, A. De Caro ²⁸, G. de Cataldo ⁵⁰, J. de Cuveland ³⁸, A. De Falco ²², D. De Gruttola ²⁸, N. De Marco ⁵⁶, C. De Martin ²³, S. De Pasquale ²⁸, R. Deb ¹³³, S. Deb ⁴⁸, K. R. Deja¹³⁵, R. Del Grande ⁹⁶, L. Dello Stritto ²⁸, W. Deng ⁶, P. Dhankher ¹⁸, D. Di Bari ³¹, A. Di Mauro ³², B. Diab ¹²⁹, R. A. Diaz ^141,7, T. Dietel ¹¹⁴, Y. Ding ⁶, R. Divià ³², D. U. Dixit ¹⁸, Ø. Djuvsland²⁰, U. Dmitrieva ¹⁴⁰, A. Dobrin ⁶³, B. Dönigus ⁶⁴, J. M. Dubinski ¹³⁵, A. Dubla ⁹⁸, S. Dudi ⁹¹, P. Dupieux ¹²⁶, M. Durkac¹⁰⁶, N. Dzalaiova¹², T. M. Eder ¹²⁵, R. J. Ehlers ⁷⁴, F. Eisenhut ⁶⁴, D. Elia ⁵⁰, B. Erazmus ¹⁰³, F. Ercolessi ²⁵, F. Erhardt ⁹⁰, M. R. Ersdal²⁰, B. Espagnon ¹³⁰, G. Eulisse ³², D. Evans ¹⁰¹, S. Evdokimov ¹⁴⁰, L. Fabbietti ⁹⁶, M. Faggin ²⁷, J. Faivre ⁷³, F. Fan ⁶, W. Fan ⁷⁴, T. Fang ⁶, A. Fantoni ⁴⁹, M. Fasel ⁸⁸, P. Fecchio²⁹, A. Feliciello ⁵⁶, G. Feofilov ¹⁴⁰, A. Fernández Téllez ⁴⁴, L. Ferrandi ¹¹⁰, M. B. Ferrer ³², A. Ferrero ¹²⁹, C. Ferrero ^56,d, A. Ferretti ²⁴, V. J. G. Feuillard ⁹⁵, D. Finogeev ¹⁴⁰, F. M. Fionda ⁵², F. Flor ¹¹⁵, A. N. Flores ¹⁰⁸, S. Foertsch ⁶⁸, I. Fokin ⁹⁵, S. Fokin ¹⁴⁰, E. Fragiacomo ⁵⁷, E. Frajna ⁴⁶, U. Fuchs ³², N. Funicello ²⁸, C. Furget ⁷³, A. Furs ¹⁴⁰, T. Fusayasu ⁹⁹, J. J. Gaardhøje ⁸⁴, M. Gagliardi ²⁴, A. M. Gago ¹⁰², C. D. Galvan ¹⁰⁹, D. R. Gangadharan ¹¹⁵, P. Ganoti ⁷⁹, C. Garabatos ⁹⁸, T. García Chávez ⁴⁴, E. Garcia-Solis ⁹, C. Gargiulo ³², K. Garner¹²⁵, P. Gasik ⁹⁸, A. Gautam ¹¹⁷, M. B. Gay Ducati ⁶⁶, M. Germain ¹⁰³, A. Ghimouz¹²⁴, C. Ghosh¹³⁴, M. Giacalone ^51,25, P. Giubellino ^98,56, P. Giubilato ²⁷, A. M. C. Glaenzer ¹²⁹, P. Glässel ⁹⁵, E. Glimos ¹²¹, D. J. Q. Goh⁷⁷, V. Gonzalez ¹³⁶, M. Gorgon ², K. Goswami ⁴⁸, S. 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Huhta ¹¹⁶, T. J. Humanic ⁸⁹, V. Humlova ³⁴, A. Hutson ¹¹⁵, D. Hutter ³⁸, R. Ilkaev¹⁴⁰, H. Ilyas ¹³, M. Inaba ¹²⁴, G. M. Innocenti ³², M. Ippolitov ¹⁴⁰, A. Isakov ⁸⁷, T. Isidori ¹¹⁷, M. S. Islam ¹⁰⁰, M. Ivanov¹², M. Ivanov ⁹⁸, V. Ivanov ¹⁴⁰, K. E. Iversen ⁷⁵, M. Jablonski ², B. Jacak ⁷⁴, N. Jacazio ²⁵, P. M. Jacobs ⁷⁴, S. Jadlovska¹⁰⁶, J. Jadlovsky¹⁰⁶, S. Jaelani ⁸³, C. Jahnke ¹¹¹, M. J. Jakubowska ¹³⁵, D. M. Janik ³⁴, M. A. Janik ¹³⁵, T. Janson⁷⁰, M. Jercic⁹⁰, S. Ji ¹⁶, S. Jia ¹⁰, A. A. P. Jimenez ⁶⁵, F. Jonas ^88,125, J. M. Jowett ^32,98, J. Jung ⁶⁴, M. Jung ⁶⁴, A. Junique ³², A. Jusko ¹⁰¹, J. Kaewjai¹⁰⁵, P. Kalinak ⁶⁰, A. S. Kalteyer ⁹⁸, A. Kalweit ³², V. Kaplin ¹⁴⁰, A. Karasu Uysal ⁷², D. Karatovic ⁹⁰, O. Karavichev ¹⁴⁰, T. Karavicheva ¹⁴⁰, P. Karczmarczyk ¹³⁵, E. Karpechev ¹⁴⁰, M. J. Karwowska ^32,135, U. Kebschull ⁷⁰, R. Keidel ¹³⁹, D. L. D. Keijdener⁵⁹, M. Keil ³², B. Ketzer ⁴², S. S. Khade ⁴⁸, A. M. Khan ^119,6, S. Khan ¹⁵, A. Khanzadeev ¹⁴⁰, Y. Kharlov ¹⁴⁰, A. Khatun ¹¹⁷, A. 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Muhuri ¹³⁴, J. D. Mulligan ⁷⁴, A. Mulliri ²², M. G. Munhoz ¹¹⁰, R. H. Munzer ⁶⁴, H. Murakami ¹²³, S. Murray ¹¹⁴, L. Musa ³², J. Musinsky ⁶⁰, J. W. Myrcha ¹³⁵, B. Naik ¹²², A. I. Nambrath ¹⁸, B. K. Nandi ⁴⁷, R. Nania ⁵¹, E. Nappi ⁵⁰, A. F. Nassirpour ^17,75, A. Nath ⁹⁵, C. Nattrass ¹²¹, M. N. Naydenov ³⁵, A. Neagu¹⁹, A. Negru¹¹³, L. Nellen ⁶⁵, G. Neskovic ³⁸, N. Nicassio ³¹, B. S. Nielsen ⁸⁴, E. G. Nielsen ⁸⁴, S. Nikolaev ¹⁴⁰, S. Nikulin ¹⁴⁰, V. Nikulin ¹⁴⁰, F. Noferini ⁵¹, S. Noh ¹¹, P. Nomokonov ¹⁴¹, J. Norman ¹¹⁸, N. Novitzky ¹²⁴, P. Nowakowski ¹³⁵, A. Nyanin ¹⁴⁰, J. Nystrand ²⁰, M. Ogino ⁷⁷, A. Ohlson ⁷⁵, V. A. Okorokov ¹⁴⁰, J. Oleniacz ¹³⁵, A. C. Oliveira Da Silva ¹²¹, M. H. Oliver ¹³⁷, A. Onnerstad ¹¹⁶, C. Oppedisano ⁵⁶, A. Ortiz Velasquez ⁶⁵, J. Otwinowski ¹⁰⁷, M. Oya⁹³, K. Oyama ⁷⁷, Y. Pachmayer ⁹⁵, S. Padhan ⁴⁷, D. Pagano ^133,55, G. Paić ⁶⁵, S. Paisano-Guzmán ⁴⁴, A. Palasciano ⁵⁰, S. Panebianco ¹²⁹, H. Park ¹²⁴, H. Park ¹⁰⁴, J. Park ⁵⁸, J. E. Parkkila ³², R. N. Patra ⁹², B. 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Reme-Ness ³⁷, Z. Rescakova³⁶, K. Reygers ⁹⁵, A. Riabov ¹⁴⁰, V. Riabov ¹⁴⁰, R. Ricci ²⁸, M. Richter ¹⁹, A. A. Riedel ⁹⁶, W. Riegler ³², C. Ristea ⁶³, M. V. Rodriguez ³², M. Rodríguez Cahuantzi ⁴⁴, S. A. Rodríguez Ramírez ⁴⁴, K. Røed ¹⁹, R. Rogalev ¹⁴⁰, E. Rogochaya ¹⁴¹, T. S. Rogoschinski ⁶⁴, D. Rohr ³², D. Röhrich ²⁰, P. F. Rojas⁴⁴, S. Rojas Torres ³⁴, P. S. Rokita ¹³⁵, G. Romanenko ¹⁴¹, F. Ronchetti ⁴⁹, A. Rosano ^30,53, E. D. Rosas⁶⁵, K. Roslon ¹³⁵, A. Rossi ⁵⁴, A. Roy ⁴⁸, S. Roy ⁴⁷, N. Rubini ²⁵, D. Ruggiano ¹³⁵, R. Rui ²³, P. G. Russek ², R. Russo ⁸⁵, A. Rustamov ⁸², E. Ryabinkin ¹⁴⁰, Y. Ryabov ¹⁴⁰, A. Rybicki ¹⁰⁷, H. Rytkonen ¹¹⁶, J. Ryu ¹⁶, W. Rzesa ¹³⁵, R. Sadek ¹⁰³, S. Sadhu ³¹, S. Sadovsky ¹⁴⁰, J. Saetre ²⁰, K. Šafařík ^34,a, P. Saha⁴¹, S. K. Saha ⁴, S. Saha ⁸¹, B. Sahoo ⁴⁷, B. Sahoo ⁴⁸, R. Sahoo ⁴⁸, S. Sahoo⁶¹, D. Sahu ⁴⁸, P. K. Sahu ⁶¹, J. Saini ¹³⁴, K. Sajdakova³⁶, S. Sakai ¹²⁴, M. P. Salvan ⁹⁸, S. Sambyal ⁹², I. Sanna ^32,96, T. B. Saramela¹¹⁰, D. Sarkar ¹³⁶, N. Sarkar¹³⁴, P. Sarma ⁴¹, V. Sarritzu ²², V. M. Sarti ⁹⁶, M. H. P. Sas ¹³⁷, J. Schambach ⁸⁸, H. S. Scheid ⁶⁴, C. Schiaua ⁴⁵, R. Schicker ⁹⁵, A. Schmah⁹⁵, C. Schmidt ⁹⁸, H. R. Schmidt⁹⁴, M. O. Schmidt ³², M. Schmidt⁹⁴, N. V. Schmidt ⁸⁸, A. R. Schmier ¹²¹, R. Schotter ¹²⁸, A. Schröter ³⁸, J. Schukraft ³², K. Schwarz⁹⁸, K. Schweda ⁹⁸, G. Scioli ²⁵, E. Scomparin ⁵⁶, J. E. Seger ¹⁴, Y. Sekiguchi¹²³, D. Sekihata ¹²³, I. Selyuzhenkov ⁹⁸, S. Senyukov ¹²⁸, J. J. Seo ⁵⁸, D. Serebryakov ¹⁴⁰, L. Šerkšnytė ⁹⁶, A. Sevcenco ⁶³, T. J. Shaba ⁶⁸, A. Shabetai ¹⁰³, R. Shahoyan ³², A. Shangaraev ¹⁴⁰, A. Sharma⁹¹, B. Sharma ⁹², D. Sharma ⁴⁷, H. Sharma ^54,107, M. Sharma ⁹², S. Sharma ⁷⁷, S. Sharma ⁹², U. Sharma ⁹², A. Shatat ¹³⁰, O. Sheibani¹¹⁵, K. Shigaki ⁹³, M. Shimomura ⁷⁸, J. Shin^11,a, S. Shirinkin ¹⁴⁰, Q. Shou ³⁹, Y. Sibiriak ¹⁴⁰, S. Siddhanta ⁵², T. Siemiarczuk ⁸⁰, T. F. Silva ¹¹⁰, D. Silvermyr ⁷⁵, T. Simantathammakul ¹⁰⁵, R. Simeonov ³⁵, B. Singh ⁹², B. Singh ⁹⁶, K. Singh ⁴⁸, R. Singh ⁸¹, R. Singh ⁹², R. Singh ⁴⁸, S. Singh ¹⁵, V. K. Singh ¹³⁴, V. Singhal ¹³⁴, T. Sinha ¹⁰⁰, B. Sitar ¹², M. Sitta ^132,56, T. B. Skaali ¹⁹, G. Skorodumovs ⁹⁵, M. Slupecki ⁴³, N. Smirnov ¹³⁷, R. J. M. Snellings ⁵⁹, E. H. Solheim ¹⁹, J. Song ^115,16, A. Songmoolnak¹⁰⁵, C. Sonnabend ^32,98, F. Soramel ²⁷, A. B. Soto-Hernandez ⁸⁹, R. Spijkers ⁸⁵, I. Sputowska ¹⁰⁷, J. Staa ⁷⁵, J. Stachel ⁹⁵, I. Stan ⁶³, P. J. Steffanic ¹²¹, S. F. Stiefelmaier ⁹⁵, D. Stocco ¹⁰³, I. Storehaug ¹⁹, P. Stratmann ¹²⁵, S. Strazzi ²⁵, C. P. Stylianidis⁸⁵, A. A. P. Suaide ¹¹⁰, C. Suire ¹³⁰, M. Sukhanov ¹⁴⁰, M. Suljic ³², R. Sultanov ¹⁴⁰, V. Sumberia ⁹², S. Sumowidagdo ⁸³, S. Swain⁶¹, I. Szarka ¹², M. Szymkowski ¹³⁵, S. F. Taghavi ⁹⁶, G. Taillepied ⁹⁸, J. Takahashi ¹¹¹, G. J. Tambave ⁸¹, S. Tang ⁶, Z. Tang ¹¹⁹, J. D. Tapia Takaki ¹¹⁷, N. Tapus ¹¹³, L. A. Tarasovicova ¹²⁵, M. G. Tarzila ⁴⁵, G. F. Tassielli ³¹, A. Tauro ³², G. Tejeda Muñoz ⁴⁴, A. Telesca ³², L. Terlizzi ²⁴, C. Terrevoli ¹¹⁵, S. Thakur ⁴, D. Thomas ¹⁰⁸, A. Tikhonov ¹⁴⁰, A. R. Timmins ¹¹⁵, M. Tkacik¹⁰⁶, T. Tkacik ¹⁰⁶, A. Toia ⁶⁴, R. Tokumoto⁹³, N. Topilskaya ¹⁴⁰, M. Toppi ⁴⁹, T. Tork ¹³⁰, A. G. Torres Ramos ³¹, A. Trifiró ^30,53, A. S. Triolo ^32,30,53, S. Tripathy ⁵¹, T. Tripathy ⁴⁷, S. Trogolo ³², V. Trubnikov ³, W. H. Trzaska ¹¹⁶, T. P. Trzcinski ¹³⁵, A. Tumkin ¹⁴⁰, R. Turrisi ⁵⁴, T. S. Tveter ¹⁹, K. Ullaland ²⁰, B. Ulukutlu ⁹⁶, A. Uras ¹²⁷, M. Urioni ^55,133, G. L. Usai ²², M. Vala ³⁶, N. Valle ²¹, L. V. R. van Doremalen⁵⁹, M. van Leeuwen ⁸⁵, C. A. van Veen ⁹⁵, R. J. G. van Weelden ⁸⁵, P. Vande Vyvre ³², D. Varga ⁴⁶, Z. Varga ⁴⁶, M. Vasileiou ⁷⁹, A. Vasiliev ^140,a, O. Vázquez Doce ⁴⁹, O. Vazquez Rueda ¹¹⁵, V. Vechernin ¹⁴⁰, E. Vercellin ²⁴, S. Vergara Limón⁴⁴, L. Vermunt ⁹⁸, R. Vértesi ⁴⁶, M. Verweij ⁵⁹, L. Vickovic³³, Z. Vilakazi¹²², O. Villalobos Baillie ¹⁰¹, A. Villani ²³, G. Vino ⁵⁰, A. Vinogradov ¹⁴⁰, T. Virgili ²⁸, M. M. O. Virta ¹¹⁶, V. Vislavicius⁷⁵, A. Vodopyanov ¹⁴¹, B. Volkel ³², M. A. Völkl ⁹⁵, K. Voloshin¹⁴⁰, S. A. Voloshin ¹³⁶, G. Volpe ³¹, B. von Haller ³², I. Vorobyev ⁹⁶, N. Vozniuk ¹⁴⁰, J. Vrláková ³⁶, J. Wan³⁹, C. Wang ³⁹, D. Wang ³⁹, Y. Wang ³⁹, A. Wegrzynek ³², F. T. Weiglhofer ³⁸, S. C. Wenzel ³², J. P. Wessels ¹²⁵, J. Wiechula ⁶⁴, J. Wikne ¹⁹, G. Wilk ⁸⁰, J. Wilkinson ⁹⁸, G. A. Willems ¹²⁵, B. Windelband ⁹⁵, M. Winn ¹²⁹, J. R. Wright ¹⁰⁸, W. Wu³⁹, Y. Wu ¹¹⁹, L. Xu ⁶, R. Xu ⁶, A. Yadav ⁴², A. K. Yadav ¹³⁴, S. Yalcin ⁷², Y. Yamaguchi ⁹³, S. Yang ²⁰, S. Yano ⁹³, Z. Yin ⁶, I.-K. Yoo ¹⁶, J. H. Yoon ⁵⁸, H. Yu ¹¹, S. Yuan²⁰, A. Yuncu ⁹⁵, V. Zaccolo ²³, C. Zampolli ³², F. Zanone ⁹⁵, N. Zardoshti ³², A. Zarochentsev ¹⁴⁰, P. Závada ⁶², N. Zaviyalov¹⁴⁰, M. Zhalov ¹⁴⁰, B. Zhang ⁶, L. Zhang ³⁹, M. Zhang ⁶, S. Zhang ³⁹, X. Zhang ⁶, Y. Zhang¹¹⁹, Z. Zhang ⁶, M. Zhao ¹⁰, V. Zherebchevskii ¹⁴⁰, Y. Zhi¹⁰, D. Zhou ⁶, Y. Zhou ⁸⁴, J. Zhu ^98,6, Y. Zhu⁶, S. C. Zugravel ⁵⁶, and N. Zurlo ^133,55 (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
¹¹Chungbuk National University, Cheongju, Republic of Korea
¹²Comenius University Bratislava, Faculty of Mathematics, Physics and Informatics, Bratislava, Slovak Republic
¹³COMSATS University Islamabad, Islamabad, Pakistan
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
³⁰University of Cagliari, 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
⁴⁰Gangneung-Wonju National University, Gangneung, Republic of Korea
⁴¹Gauhati University, Department of Physics, Guwahati, India
⁴²Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
⁴³Helsinki Institute of Physics (HIP), Helsinki, Finland
⁴⁴High Energy Physics Group, Universidad Autónoma de Puebla, Puebla, Mexico
⁴⁵Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
⁴⁶HUN-REN Wigner Research Centre for Physics, Budapest, Hungary
⁴⁷Indian Institute of Technology Bombay (IIT), Mumbai, India
⁴⁸Indian Institute of Technology Indore, Indore, India
⁴⁹INFN, Laboratori Nazionali di Frascati, Frascati, Italy
⁵⁰INFN, Sezione di Bari, Bari, Italy
⁵¹INFN, Sezione di Bologna, Bologna, Italy
⁵²INFN, Sezione di Cagliari, Cagliari, Italy
⁵³INFN, Sezione di Catania, Catania, Italy
⁵⁴INFN, Sezione di Padova, Padova, Italy
⁵⁵INFN, Sezione di Pavia, Pavia, Italy
⁵⁶INFN, Sezione di Torino, Turin, Italy
⁵⁷INFN, Sezione di Trieste, Trieste, Italy
⁵⁸Inha University, Incheon, Republic of Korea
⁵⁹Institute for Gravitational and Subatomic Physics (GRASP), Utrecht University/Nikhef, Utrecht, Netherlands
⁶⁰Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
⁶¹Institute of Physics, Homi Bhabha National Institute, Bhubaneswar, India
⁶²Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
⁶³Institute of Space Science (ISS), Bucharest, Romania
⁶⁴Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
⁶⁵Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico
⁶⁶Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
⁶⁷Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
⁶⁸iThemba LABS, National Research Foundation, Somerset West, South Africa
⁶⁹Jeonbuk National University, Jeonju, Republic of Korea
⁷⁰Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik, Fachbereich Informatik und Mathematik, Frankfurt, Germany
⁷¹Korea Institute of Science and Technology Information, Daejeon, Republic of Korea
⁷²KTO Karatay University, Konya, Turkey
⁷³Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS-IN2P3, Grenoble, France
⁷⁴Lawrence Berkeley National Laboratory, Berkeley, California, USA
⁷⁵Lund University Department of Physics, Division of Particle Physics, Lund, Sweden
⁷⁶Marietta Blau Institute, Vienna, Austria
⁷⁷Nagasaki Institute of Applied Science, Nagasaki, Japan
⁷⁸Nara Women's University (NWU), Nara, Japan
⁷⁹National and Kapodistrian University of Athens, School of Science, Department of Physics, Athens, Greece
⁸⁰National Centre for Nuclear Research, Warsaw, Poland
⁸¹National Institute of Science Education and Research, Homi Bhabha National Institute, Jatni, India
⁸²National Nuclear Research Center, Baku, Azerbaijan
⁸³National Research and Innovation Agency - BRIN, Jakarta, Indonesia
⁸⁴Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
⁸⁵Nikhef, National institute for subatomic physics, Amsterdam, Netherlands
⁸⁶Nuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United Kingdom
⁸⁷Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic
⁸⁸Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
⁸⁹Ohio State University, Columbus, Ohio, USA
⁹⁰Physics department, Faculty of science, University of Zagreb, Zagreb, Croatia
⁹¹Physics Department, Panjab University, Chandigarh, India
⁹²Physics Department, University of Jammu, Jammu, India
⁹³Physics Program and International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM²), Hiroshima University, Hiroshima, Japan
⁹⁴Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Tübingen, Germany
⁹⁵Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
⁹⁶Physik Department, Technische Universität München, Munich, Germany
⁹⁷Politecnico di Bari and Sezione INFN, Bari, Italy
⁹⁸Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
⁹⁹Saga University, Saga, Japan
¹⁰⁰Saha Institute of Nuclear Physics, Homi Bhabha National Institute, Kolkata, India
¹⁰¹School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
¹⁰²Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru
¹⁰³SUBATECH, IMT Atlantique, Nantes Université, CNRS-IN2P3, Nantes, France
¹⁰⁴Sungkyunkwan University, Suwon City, Republic of Korea
¹⁰⁵Suranaree University of Technology, Nakhon Ratchasima, Thailand
¹⁰⁶Technical University of Košice, Košice, Slovak Republic
¹⁰⁷The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
¹⁰⁸The University of Texas at Austin, Austin, Texas, USA
¹⁰⁹Universidad Autónoma de Sinaloa, Culiacán, Mexico
¹¹⁰Universidade de São Paulo (USP), São Paulo, Brazil
¹¹¹Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
¹¹²Universidade Federal do ABC, Santo Andre, Brazil
¹¹³Universitatea Nationala de Stiinta si Tehnologie Politehnica Bucuresti, Bucharest, Romania
¹¹⁴University of Cape Town, Cape Town, South Africa
¹¹⁵University of Houston, Houston, Texas, USA
¹¹⁶University of Jyväskylä, Jyväskylä, Finland
¹¹⁷University of Kansas, Lawrence, Kansas, USA
¹¹⁸University of Liverpool, Liverpool, United Kingdom
¹¹⁹University of Science and Technology of China, Hefei, China
¹²⁰University of South-Eastern Norway, Kongsberg, Norway
¹²¹University of Tennessee, Knoxville, Tennessee, USA
¹²²University of the Witwatersrand, Johannesburg, South Africa
¹²³University of Tokyo, Tokyo, Japan
¹²⁴University of Tsukuba, Tsukuba, Japan
¹²⁵Universität Münster, Institut für Kernphysik, Münster, Germany
¹²⁶Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹²⁷Université de Lyon, CNRS/IN2P3, Institut de Physique des 2 Infinis de Lyon, Lyon, France
¹²⁸Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France, Strasbourg, France
¹²⁹Université Paris-Saclay, Centre d'Etudes de Saclay (CEA), IRFU, Départment de Physique Nucléaire (DPhN), Saclay, France
¹³⁰Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹³¹Università degli Studi di Foggia, Foggia, Italy
¹³²Università del Piemonte Orientale, Vercelli, Italy
¹³³Università di Brescia, Brescia, Italy
¹³⁴Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India
¹³⁵Warsaw University of Technology, Warsaw, Poland
¹³⁶Wayne State University, Detroit, Michigan, USA
¹³⁷Yale University, New Haven, Connecticut, USA
¹³⁸Yonsei University, Seoul, Republic of Korea
¹³⁹Zentrum für Technologie und Transfer (ZTT), Worms, Germany
¹⁴⁰Affiliated with an institute formerly covered by a cooperation agreement with CERN
¹⁴¹Affiliated with an international laboratory covered by a cooperation agreement with CERN

^aDeceased.
^bAlso at Max-Planck-Institut fur Physik, Munich, Germany.
^cAlso at Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Bologna, Italy.
^dAlso at Dipartimento DET del Politecnico di Torino, Turin, Italy.
^eAlso at Lehigh University, USA.
^fAlso at Department of Applied Physics, Aligarh Muslim University, Aligarh, India.
^gAlso at Institute of Theoretical Physics, University of Wroclaw, Poland.

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Phys. Rev. C 113, 044905 – Published 13 April, 2026

DOI: https://doi.org/10.1103/5bdl-cry6

Abstract

This paper presents the first measurement of the angle between different jet axes (denoted as $Δ R_{axis}$ ) in $Pb-Pb$ collisions. The measurement is carried out in the 0–10 % most-central events at $\sqrt{s_{N N}} = 5.02$ TeV. Jets are assembled by clustering charged particles at midrapidity using the $anti- k_{T}$ algorithm with resolution parameters $R = 0.2$ and 0.4 and transverse momenta in the intervals $40 < p_{T}^{ch jet} < 140 GeV / c$ and $80 < p_{T}^{ch jet} < 140 GeV / c$ , respectively. Measurements at these low transverse momenta enhance the sensitivity to quark-gluon plasma (QGP) effects. A comparison to models implementing various mechanisms of jet energy loss in the QGP suggests that the observed narrowing of the $Pb-Pb$ distribution relative to $pp$ can be explained if quark-initiated jets are more likely to emerge from the medium than gluon-initiated jets. These new measurements disfavor intrajet $p_{T}$ broadening as implemented in a simple model calculation with the Baier-Dokshitzer-Mueller-Peigne-Schiff formalism for energy loss in the QGP. The comparison of $Pb-Pb$ and $pp$ collisions shows sensitivity to the angular scale at which the QGP can resolve two independent splittings, favoring mechanisms that incorporate incoherent energy loss.

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Article Text

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Phys. Rev. C 113, 044905– Published 13 April, 2026

Vol. 113, Iss. 4 — April 2026

Received 23 July 2024
Revised 6 October 2025
Accepted 18 November 2025

DOI: https://doi.org/10.1103/5bdl-cry6

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 the angle between jet axes in Pb-Pb collisions at $\sqrt{s_{N N}} = 5.02$ TeV

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Measurement of the angle between jet axes in Pb-Pb collisions at sNN=5.02 TeV

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Measurement of the angle between jet axes in Pb-Pb collisions at $\sqrt{s_{N N}} = 5.02$ TeV