The inclusive photon energy spectra measured by the Large Hadron Collider forward (LHCf) experiment in the very forward region of LHC proton-proton collisions at √s=900GeV are reported. The results from the analysis of 0.30 nb -1 of data collected in May 2010 in the two pseudorapidity regions of η>10.15 and 8.77<η<9.46 are compared with the predictions of the hadronic interaction models DPMJET 3.04, EPOS 1.99, PYTHIA 8.145, QGSJET II-03 and SIBYLL 2.1, which are widely used in ultra-high energy cosmic ray experiments. EPOS 1.99 and SIBYLL 2.1 show a reasonable agreement with the spectral shape of the experimental data, whereas they predict lower cross-sections than the data. The other models, DPMJET 3.04, QGSJET II-03 and PYTHIA 8.145, are in good agreement with the data below 300 GeV but predict harder energy spectra than the data above 300 GeV.The results of these comparisons exhibited features similar to those for the previously reported data for √s=7TeV collisions.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2012 Sep 10|
- Hadronic interaction models
- Ultra-high energy cosmic ray
ASJC Scopus subject areas
- Nuclear and High Energy Physics