Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T01: Astroparticle and Gravitational Waves
Results from the LHCf Run II in proton-proton collisions at √s = 13 TeV
A. Tiberio*, O. Adriani, E. Berti, L. Bonechi, M. Bongi, R. D'Alessandro, G. Castellini, M. Haguenauer, Y. Itow, K. Kasahara, M. Kondo, Y. Matsubara, H. Menjo, Y. Muraki, K. Ohashi, P. Papini, S. Ricciarini, T. Sako, N. Sakurai, K. Sato, Y. Shimizu, T. Tamura, S. Torii, A. Tricomi, W.C. Turner, M. Ueno and K. Yoshidaet al. (click to show)
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Abstract
The LHCf experiment, at the Large Hadron Collider (LHC), consists of two small independent calorimeters placed 140 metres away, on opposite sides of the ATLAS interaction point (IP1). LHCf has the capability to measure zero-degree neutral particles, covering the pseudorapidity region above 8.4. By measuring the very-forward particle production rates at the highest energy possible at an accelerator, LHCf aims to improve our understanding of hadronic interactions in air-showers induced by ultra-high-energy cosmic rays in the atmosphere. This contribution will highlight recent results from Run II measurements with p-p collisions at 13 TeV. At first, the advantages of an ATLAS-LHCf combined analysis are discussed and a preliminary energy spectrum of very-forward photons produced in diffractive collisions as tagged by ATLAS is shown. The neutron energy spectrum measurements, for several pseudorapidity regions, are presented and compared with the predictions of various hadronic interaction models. From these measurements the average inelasticity of the collisions, which strongly affects the development of an air-shower, has also been extracted. Finally, the preliminary $\pi^0$ Feynman-x and transverse momentum spectra, which affect the development of the electromagnetic component of an air-shower, are shown.
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