Classification of Events in the Combined ATLAS-LHCf Data Recorded During the $p$+Pb Collisions at $\sqrt{s_\textrm{NN}}=5.02$ TeV

This document reports on the first analysis of a common dataset recorded by the ATLAS and the LHCf detectors during the proton-lead collisions at $\sqrt{s_\textrm{NN}}=5.02$ TeV in 2013. The LHCf trigger signal was incorporated in the ATLAS Level-1 trigger system and it is shown that the common events recorded by ATLAS and LHCf can be matched off-line. Preliminary analysis of the combined dataset is carried out, forming an important precedent for the future ATLAS-LHCf collaboration that will allow to further improve our understanding of cosmic-ray air showers and modelling of inelastic processes at the LHC. The discrimination power of using information from ATLAS to classify the events with reconstructed particles in LHCf is demonstrated.