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In this paper, we report the measurement relative to the production offorward neutrons in proton-proton collisions at $\mathrm{\sqrt{s} = 13~TeV}$obtained using the LHCf Arm2 detector at the Large Hadron Collider. The resultsfor the inclusive differential production cross section are presented as afunction of energy in three different pseudorapidity regions: $\eta > 10.76$,$8.99 < \eta < 9.22$ and $8.81 < \eta < 8.99$. The analysis was performed usinga data set acquired in June 2015 that corresponds to an integrated luminosityof $\mathrm{0.194~nb^{-1}}$. The measurements were compared with thepredictions of several hadronic interaction models used to simulate air showersgenerated by Ultra High Energy Cosmic Rays. None of these generators showedgood agreement with the data for all pseudorapidity intervals. For $\eta >10.76$, no model is able to reproduce the observed peak structure at around$\mathrm{5~TeV}$ and all models underestimate the total production crosssection: among them, QGSJET II-04 shows the smallest deficit with respect todata for the whole energy range. For $8.99 < \eta < 9.22$ and $8.81 < \eta <8.99$, the models having the best overall agreement with data are SIBYLL 2.3and EPOS-LHC, respectively: in particular, in both regions SIBYLL 2.3 is ableto reproduce the observed peak structure at around $\mathrm{1.5-2.5~TeV}$.

the journal of high energy physics/the journal of high energy physics

Measurement of inclusive forward neutron production cross section in  proton-proton collisions at $\mathrm{\sqrt{s} = 13~TeV}$ with the LHCf Arm2  detector