Forward photon energy spectrum at LHC 7 TeV p-p collisions measured by LHCf

H. Menjo*, O. Adriani, M. Bongi, G. Castellini, R. Dalessandro, K. Fukatsu, M. Haguenauer, Y. Itow, K. Kasahara, K. Kawade, D. MacIna, T. Mase, K. Masuda, G. Mitsuka, Y. Muraki, M. Nakai, K. Noda, P. Papini, A. L. Perrot, S. RicciariniT. Sako, Y. Shimizu, K. Suzuki, T. Suzuki, K. Taki, T. Tamura, Shoji Torii, A. Tricomi, W. C. Turner

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    The LHCf experiment is one of the LHC forward experiments. The aim is to measure the energy and the transverse momentum spectra of photons, neutrons and π0s at the very forward region (the pseudo-rapidity range of η>8.4), which should be critical data to calibrate hadron interaction models used in the air shower simulations. LHCf successfully operated at s=900GeV and s=7TeV proton-proton collisions in 2009 and 2010. We present the first physics result, single photon energy spectra at s=7TeV proton-proton collisions and the pseudo-rapidity ranges of η>10.94 and 8.81<η<8.9. The obtained spectra were compared with the predictions by several hadron interaction models and the models do not reproduce the experimental results perfectly.

    Original languageEnglish
    Pages (from-to)224-227
    Number of pages4
    JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Publication statusPublished - 2012 Nov 11


    • Hadron interaction model
    • LHCf
    • UHECRs

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics


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