Author/Authors :
Menjo، نويسنده , , H. and Adriani، نويسنده , , O. and Bongi، نويسنده , , M. and Castellini، نويسنده , , G. and DʹAlessandro، نويسنده , , R. and Fukatsu، نويسنده , , K. and Haguenauer، نويسنده , , M. and Itow، نويسنده , , Y. and Kasahara، نويسنده , , K. and Kawade، نويسنده , , K. and Macina، نويسنده , , D. and Mase، نويسنده , , T. and Masuda، نويسنده , , K. and Mitsuka، نويسنده , , G. and Muraki، نويسنده , , Y. and Nakai، نويسنده , , M. and Nod، نويسنده ,
Abstract :
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 π 0 ʹs 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 = 900 GeV and s = 7 TeV proton–proton collisions in 2009 and 2010. We present the first physics result, single photon energy spectra at s = 7 TeV 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.
