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Aab, A; Abreu, P; Albuquerque, I F M; Allekotte, I; Arqueros, F; Arsene, N; Aublin, J; Avila, G; Bellido, J A; Biermann, P L; Billoir, P; Bonifazi, C; Briechle, F L; Buscemi, M; Canfora, F; Cataldi, G; Chirinos Diaz, J C; Coleman, A; Coluccia, M R; Dawson, B R; de Almeida, R M; de Jong, S J; de Mello Neto, J R T; Díaz Castro, M L; Ebr, J; Etchegoyen, A; Fazzini, N; Ferguson, A P; Garcia-Pinto, D; Gate, F; Giammarchi, M; Gómez Vitale, P F; Grubb, T D; Herve, A E; Hojvat, C; Hörandel, J R; Huege, T; Insolia, A; Isar, P G; Jandt, I; Jansen, S; Kemp, E; Klages, H O; Krohm, N; Letessier-Selvon, A; López Casado, A; Malacari, M; Mallamaci, M; Mandat, D; Mariazzi, A G; Martello, D; Maurizio, D; Minaya, I A; Mostafá, M; Moura, C A; Naranjo, I; Nellen, L; Nguyen, P H; Nosek, D; Nožka, H; Núñez, L A; Ochilo, L; Pakk Selmi-Dei, D; Palatka, M; Pallotta, J; Perrone, L; Petermann, E; Petrera, S; Piegaia, R; Plum, M; Rautenberg, J; Ravignani, D; Rizi, V; Rodriguez Rojo, J; Roulet, E; Sanabria Gomez, J D; Santos, E; Schauer, M; Schieler, H; Schmidt, D; Schulz, A; Schumacher, J; Segreto, A; Suomijärvi, T; Swain, J; Theodoro, V M; Tonachini, A; Torres Machado, D; Unger, M; Urban, M; van Vliet, A; Vázquez, J R; Wahlberg, H; Wainberg, O; Weber, M; Wittkowski, D; Yang, L; Yelos, D; Zas, E; Zong, Z
Physical review letters, 2016-Nov-04, Letnik: 117, Številka: 19Journal Article
Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E_{CM}=110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33±0.16 (1.61±0.21) times larger than predicted using the leading LHC-tuned models EPOS-LHC (QGSJetII-04), with a corresponding excess of muons.
