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Abstract
LHCf is an experiment dedicated to verify the hadronic interaction models by measuring the forward neutral particle production at the LHC. Corresponding data are very important for understanding hadronic interactions occurring in air-shower development. According to the current LHCf results, no simulation model predicts the LHCf data perfectly. In order to provide more specific data, it is necessary to classify the LHCf observables into specific interaction types: diffraction or non-diffraction. Combining the information of ATLAS, LHCf is able to classify these specific interaction types experimentally. Especially, the ATLAS-LHCf joint experiment will have the unique sensitivity to low mass diffraction. LHCf and ATLAS have succeeded in the common data-taking in p-p collisions at √s = 13 TeV. We will report the first ATLAS-LHCf joint analysis result and discuss the impact of the corresponding joint analysis result to the determination of mass composition of ultra-high energy cosmic-rays.
Highlights
The Large Hadron Collider forward (LHCf) experiment [1] is capable of measuring neutral particle productions at zero degree of the LHC
The approaches to implement the diffractive and nondiffractive processes are totally different in the hadronic interaction models
The ratio of photon spectrum derived from the low-mass diffraction (Nch = 0) to the inclusive photon spectrum is shown in the bottom pad of Fig. 3
Summary
The Large Hadron Collider forward (LHCf) experiment [1] is capable of measuring neutral particle productions at zero degree of the LHC. Corresponding particles are known to play an important role in controlling the airshower profile. The LHC allows to provide a unique chance to access hadronic interactions at 1017. EV as the laboratory equivalent collision energy. LHCf hthaedoapceormatimononadt a√tasa=cq1u3isTiteioVn with ATLAS experiment in p-p collisions. Point of the LHC, while having different pesudorapidity coverage. LHCf covers the very forward region and AT-. LAS has the sensitivity to the central region. The ATLAS central information makes it possible to classify the LHCf observed events into diffraction or non-diffraction on an event-by-event basis
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