Journal
PHYSICS LETTERS B
Volume 715, Issue 4-5, Pages 298-303Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2012.07.065
Keywords
LHC; Ultra-high energy cosmic ray; Hadronic interaction models
Funding
- MEXT of Japan
- Mitsubishi Foundation in Japan
- INFN in Italy
- JSPS Research Fellowship
- INFN fellowship for non-Italian citizens
- GCOE Program of Nagoya University 'QFPU' from JSPS
- GCOE Program of Nagoya University 'QFPU' from MEXT
- Grants-in-Aid for Scientific Research [23740183, 23340076, 23244050] Funding Source: KAKEN
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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 root s = 900 GeV are reported. The results from the analysis of 0.30 nb(-1) of data collected in May 2010 in the two pseudorapidity regions of eta > 10.15 and 8.77 < eta <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 root s = 7 TeV collisions. (c) 2012 Elsevier B.V. All rights reserved.
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