Inclusive photon energy spectra at zero degree of the LHC 7 TeV proton-proton collisions by the LHCf experiment

The Large Hadron Collider forward (LHCf) experiment measured the energy spectra of the neutral particles from the LHC proton-proton collisions into the very forward region. The analysis results of single-photon spectra at vs=7 TeV taken in May 15, 2010 are presented in this paper. The spectra from two independent LHCf detectors are consistent with one another. The photon spectra are also compared with the predictions of several hadronic interaction models that are employed in many experiments aiming for measuring high-energy cosmic-ray showers.