Results from the LHCf Run II in proton-proton collisions at vs = 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. SatoY. Shimizu, T. Tamura, S. Torii, A. Tricomi, W. C. Turner, M. Ueno, K. Yoshida

Research output: Contribution to journalConference articlepeer-review


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 p0 Feynman-x and transverse momentum spectra, which affect the development of the electromagnetic component of an air-shower, are shown.

Original languageEnglish
Article number105
JournalProceedings of Science
Publication statusPublished - 2021
Event2021 European Physical Society Conference on High Energy Physics, EPS-HEP 2021 - Virtual, Online
Duration: 2021 Jul 262021 Jul 30

ASJC Scopus subject areas

  • General


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