LHC Revealing Ultra High Energy Astrophysics

Abstract

To reveal the origin of Ultra-High-Energy Cosmic Rays reaching 10^<20> eV precise knowledge of the air shower development is indispensible. LHCf is a dedicated experiment to measure the forward particle production in the hadronic interaction at Large Hadron Collider, CERN. LHC realizes particle collisions corresponding to the laboratory energy of 10^<17> eV. LHCf successfully completed the first operation at LHC and published the very forward photon spectra for 7 TeV collisions. This article introduces the background and recent results of the LHCf experiment.