Evidence for parton energy loss in oxygen$-$oxygen collisions at $\sqrt{s_{\rm NN}}$ = 5.36TeV
Dana Ali Hassan Abdallah, Ibrahim Jaser Abualrob, Shreyasi Acharya, Kshitij Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, Neelima Agrawal, Zubayer Ahammed, S. Ahmad, Zulkaida Akbar, Valentina Akishina, Mohammad Al-Turany, Bruno Alessandro, Abdul Rahman Alfarasyi, Jose Ruben Alfaro Molina, Bushra Ali, Andrea Alici, Johan Alme, Giacomo Alocco, Torsten Alt, Igor Altsybeev, Cristian Andrei, Nicodemos Andreou, Anton Andronic, Massimo Angeletti, Venelin Anguelov, Federico Antinori, Pietro Antonioli, Nicole Apadula, Harald Appelshaeuser, Silvia Arcelli, Roberta Arnaldi, I C Arsene, Mesut Arslandok, Andre Augustinus, Ralf Peter Averbeck, Mohd Danish Azmi, Byungyun Kong, Hitoshi Baba, Akash Raj John Babu, Angela Badala, JH BAE, Yunseul Bae, Yongwook Baek, Xiaozhi Bai, Raphaelle Marie Bailhache, Yoshini Bailung, Renu Bala, Alberto Baldisseri, Bartosz Balis, Shubham Bangalia, Koushik Barai, Veronika Barbasová, Francesco Barile, Luca Barioglio, Maria Barlou, Banajit Barman, Gergely Gabor Barnafoldi, Lee Stuart Barnby, Emilie Martine Barreau, Valerie Ramillien Barret, Leonardo Barreto De Oliveira Campos, Klaus Barth, Esther Bartsch, Nicole Bastid, Guillaume Batigne, Daniel Battistini, Boris Batyunya, Luca Baudino, Dibakar Bauri, Jose Luis Bazo Alba, Ian Gardner Bearden, Debadatta Behera, Swadhin Behera, Maria Alejandra Calmon Behling, Iouri Belikov, Valerio Di Bella, Francesca Bellini, Rene Bellwied, Lucina Gabriela Espinoza Beltran, Yael Antonio Vasquez Beltran, Gyula Bencedi, Oussama Benchikhi, Adel Bensaoula, Stefania Maria Beole, Anastasia Berdnikova, Luisa Bergmann, Lorenzo Bernardinis, Latchezar Betev, Partha Pratim Bhaduri, Tushar Bhalla, Anju Bhasin, Buddhadeb Bhattacharjee, Livio Bianchi, Jaroslav Bielcik, Jana Bielcikova, Ante Bilandzic, Anna Binoy, Gabor Biro, Saikat Biswas, Mihail Bogdan Blidaru, Nora Bluhme, Christoph Blume, Friederike Bock, Tea Bodova, Laszlo Boldizsar, Marek Bombara, Peter Matthew Bond, Germano Bonomi, Herve Borel, Alexander Borissov, Andres Gerardo Borquez Carcamo, Elena Botta, Naseem Bouchhar, Youssef El Mard Bouziani, Diana Catalina Brandibur, Lars Bratrud, Peter Braun-Munzinger, Marco Bregant, Michal Broz, Giuseppe Eugenio Bruno, Hjalmar Brunßen, Valentin Dimitrov Buchakchiev, Matthew Daniel Buckland, Guilherme Felipe Budiski, Henner Buesching, Stefania Bufalino, Paul Alois Buhler, Nazar Burmasov, Edith Zinhle Buthelezi, Aleksandr Bylinkin, Olga Bessidskaia Bylund, Juan Carlos Cabanillas Noris, Maria Fernanda Torres Cabrera, Helen Louise Caines, Alberto Caliva, Ernesto Calvo Villar, Paolo Camerini, Maria Teresa Camerlingo, Stefano Cannito, Sierra Lisa Cantway, Mihai Carabas, Francesca Carnesecchi, Christopher Alfred Carr, Leopoldo Abranches De Carvalho, Javier Ernesto Castillo Castellanos, Matteo Castoldi, Fabio Catalano, Samuele Cattaruzzi, Rebecca Cerri, Irakli Chakaberia, Pritam Chakraborty, Justin Wei Ong Chan, Sinjini Chandra, Sylvain Chapeland, Marielle Chartier, Souvik Chattopadhay, Meiyi Chen, Tiantian Cheng, Madalin Ilie Cherciu, Cvetan Valeriev Cheshkov, Davide Chiappara, Vasco Miguel Chibante Barroso, David Dobrigkeit Chinellato, Fabrizio Chinu, Jaeyoon Cho, Soyeon Cho, Peter Chochula, Zuzanna Anna Chochulska, Changhwan Choi, Pryianka Choudhary, Panagiotis Christakoglou, Peter Christiansen, Tatsuya Chujo, Barbara Chytla, Mario Ciacco, C CICALO, Gabriele Cimador, Federico Cindolo, Fabio Colamaria, Domenico Colella, Angelo Colelli, Manuel Colocci, Matteo Concas, Gustavo Conesa Balbastre, Zaida Conesa Del Valle, Giacomo Contin, Jesus Guillermo Contreras Nuno, Maurice Coquet, P CORTESE, Mauro Rogerio Cosentino, Filippo Costa, Susanna Costanza, Philippe Crochet, Maciej Marek Czarnynoga, Andrea Dainese, Elena Dall'Occo, Gautam Dange, Meike Charlotte Danisch, Andrea Danu, Aizat Daribayeva, Prottay Das, Supriya Das, Archita Rani Dash, Sadhana Dash, Annalisa De Caro, G. de Cataldo, Jan De Cuveland, Alessandro De Falco, Daniele De Gruttola, Nora De Marco, Chiara De Martin, Salvatore De Pasquale, Rohaan Deb, Raffaele Del Grande, Luigi Dello Stritto, Geovane Grossi Araujo de Souza, Preeti Dhankher Lesser, Domenico Di Bari, Marcello Di Costanzo, Antonio Di Mauro, Benedetto Di Ruzza, Batoul Diab, Kalina Dimitrova, Yanchun Ding, Janik Ditzel, R Divia', Uliana Dmitrieva, Alexandru Florin Dobrin, Benjamin Donigus, Lars Döpper, Lukasz Janusz Drzensla, Andrea Dubla, Pascal Dupieux, Tabea Maria Eder, Emma Charlotte Ege, Ehlers, Raymond James, III, Florian Eisenhut, Ren Ejima, D Elia, Barbara Ewa Erazmus, Francesca Ercolessi, Bruno Espagnon, Giulio Eulisse, David Evans, Laura Fabbietti, Gaia Fabbri, Mattia Faggin, Julien Faivre, Wenqing Fan, Yixin Fan, Tao Fang, Alessandra Fantoni, Alessandro Feliciello, Wenhui Feng, Roberta Ferioli, Arturo Fernandez Tellez, Bamina Fernando, Lucas Ferrandi De Oliveira, Andrea Ferrero, Chiara Ferrero, Alessandro Ferretti, Victor Jose Gaston Feuillard, Fiorella Fionda, Amanda Nicole Flores, Siegfried Valentin Foertsch, Ilya Fokin, Umberto Follo, Robert Forynski, Enrico Fragiacomo, Henrik Fribert, Ulrich Fuchs, Davide Fuligno, Nicola Funicello, Christophe Furget, Takahiro Fusayasu, Jens Joergen 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Le résumé fourni par la source
Ultra-relativistic heavy-ion collisions create a hot and dense medium of deconfined quarks and gluons, the quark$-$gluon plasma (QGP), in which parton energy loss ("jet quenching") is a key probe of hot medium properties. While parton energy loss has been firmly established in large systems such as Pb$-$Pb and Au$-$Au collisions, no unambiguous direct evidence exists in smaller systems such as high-multiplicity p$-$Pb and pp collisions. To probe the onset of parton energy loss at intermediate system size, measurements of neutral-pion production are presented in this Letter for oxygen$-$oxygen (OO) and proton--oxygen (pO) collisions recorded with the ALICE detector in July 2025, relative to a pp baseline. The nuclear modification factor $R_{\rm OO}$ is suppressed relative to unity with a transverse-momentum dependence similar to that observed in Pb$-$Pb collisions, consistent with a previous CMS measurement in OO collisions with charged particles. As $R_{\rm OO}$ contains contributions from both cold and hot nuclear matter effects, $R_{\rm pO}$ is also presented in order to constrain cold nuclear matter (CNM) contributions. $R_{\rm pO}$ is found to be compatible with unity, indicating that CNM effects alone cannot account for the suppression observed in $R_{\rm OO}$. Final-state effects are isolated using the measured double ratio $R_{\rm OO}/R_{\rm pO}^2$, which largely cancels CNM contributions and exhibits a significant suppression relative to expectations without energy loss at a $4.9\sigma$ level. Theoretical models incorporating parton energy loss via different mechanisms predict a significant suppression of the $R_{\rm OO}/R_{\rm pO}^2$ relative to unity, consistent with the data. These findings establish parton energy loss in OO collisions, extending experimental evidence for jet quenching to the smallest nuclear system studied to date.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.