Measurement of inclusive forward neutron production cross section in proton-proton collisions at √s=13 TeV with the LHCf Arm2 detector

The LHCf Collaboration

    Research output: Contribution to journalArticle

    4 Citations (Scopus)


    In this paper, we report the measurement relative to the production of forward neutrons in proton-proton collisions at s=13 TeV obtained using the LHCf Arm2 detector at the Large Hadron Collider. The results for the inclusive differential production cross section are presented as a function of energy in three different pseudorapidity regions: η > 10.76, 8.99 < η < 9.22 and 8.81 < η < 8.99. The analysis was performed using a data set acquired in June 2015 that corresponds to an integrated luminosity of 0.194 nb−1. The measurements were compared with the predictions of several hadronic interaction models used to simulate air showers generated by Ultra High Energy Cosmic Rays. None of these generators showed good agreement with the data for all pseudorapidity intervals. For η > 10.76, no model is able to reproduce the observed peak structure at around 5 TeV and all models underestimate the total production cross section: among them, QGSJET II-04 shows the smallest deficit with respect to data for the whole energy range. For 8.99 < η < 9.22 and 8.81 < η < 8.99, the models having the best overall agreement with data are SIBYLL 2.3 and EPOS-LHC, respectively: in particular, in both regions SIBYLL 2.3 is able to reproduce the observed peak structure at around 1.5–2.5 TeV.[Figure not available: see fulltext.].

    Original languageEnglish
    Article number73
    JournalJournal of High Energy Physics
    Issue number11
    Publication statusPublished - 2018 Nov 1



    • Forward physics
    • Hadron-Hadron scattering (experiments)
    • Unfolding

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this