QCD challenges from pp to AA collisions: 4th edition oleh Javira Altmann, Carlota Andres, Anton Andronic, Federico Antinori, Pietro Antonioli, Andrea Beraudo, Eugenio Berti, Livio Bianchi, Thomas Boettcher, Lorenzo Capriotti, Peter Christiansen, Jesus Guillermo Contreras Nuño, Leticia Cunqueiro Mendez, Cesar da Silva, Andrea Dainese, Hans Peter Dembinski, David Dobrigkeit Chinellato, Andrea Dubla, Mattia Faggin, Chris Flett, Vincenzo Greco, Ilia Grishmanovskii, Jack Holguin, Yuuka Kanakubo, Dong Jo Kim, Ramona Lea, Su Houng Lee, Saverio Mariani, Adam Matyja, Aleksas Mazeliauskas, Vincenzo Minissale, Andreas Morsch, Lucia Oliva, Luca Orusa, Petja Paakkinen, Daniel Pablos, Guy Paić, Tanguy Pierog, Salvatore Plumari, Francesco Prino, Andrea Rossi, Lorenzo Sestini, Peter Skands, Olga Soloveva, Francesca Soramel, Alba Soto Ontoso, Martin Spousta, Andre Govinda Stahl Leiton, Jiayin Sun, Adam Takacs, Stefano Trogolo, Rosario Turrisi, Marta Verweij, Vytautas Vislavicius, Jing Wang, Klaus Werner, Valentina Zaccolo, Mingyu Zhang, Jianhui Zhu, Davide Zuliani