1. Measurement of the forward $\eta$ meson production rate in p-p collisions at $\sqrt{s}$=13 TeV with the LHCf-Arm2 detector
- Author
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Piparo, Giuseppe, Adriani, Oscar, Berti, Eugenio, Betti, Pietro, Bonechi, Lorenzo, Bongi, Massimo, D'Alessandro, Raffaello, Detti, Sebastiano, Haguenauer, Maurice, Itow, Yoshitaka, Kasahara, Katsuaki, Kitagami, Yuga, Kondo, Moe, Matsubara, Yutaka, Menjo, Hiroaki, Muraki, Yasushi, Ohashi, Ken, Papini, Paolo, Ricciarini, Sergio, Sako, Takashi, Sakurai, Nobuyuki, Scaringella, Monica, Shimizu, Yuki, Tamura, Tadashi, Tiberio, Alessio, Torii, Shoji, Tricomi, Alessia, Turner, William C., and Yoshida, Kenji
- Subjects
High Energy Physics - Experiment - Abstract
The forward $\eta$ mesons production has been observed by the Large Hadron Collider forward (LHCf) experiment in proton-proton collision at $\sqrt{s}$=13 TeV. This paper presents the measurement of the inclusive production rate of $\eta$ in $p_T<$ 1.1 GeV/c, expressed as a function of the Feynman-x variable. These results are compared with the predictions of several hadronic interaction models commonly used for the modelling of the air showers produced by ultra-high energy cosmic rays. This is both the first measurement of $\eta$ mesons from LHCf and the first time a particle containing strange quarks has been observed in the forward region for high-energy collisions. These results will provide a powerful constraint on hadronic interaction models for the purpose of improving the understanding of the processes underlying the air showers produced in the Earth's atmosphere by ultra-energetic cosmic rays., Comment: 18 pages, 7 figures, 4 tables
- Published
- 2023
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