Early results of the LHCf experiment and their contribution to ultra-high-energy cosmic ray physics

, M. Nakai(7), K. Noda(5), P. Papini(1),A-L. Perrot(8), S. Ricciarini(1), T. Sako(5), K. Suzuki(5), T. Suzuki(7), Y. Shimizu(7),K. Taki(5), T. Tamura(10), S. Torii(7), A. Tricomi(11,12), J. Velasco(4),W. C. Turner(13), K. Yoshida(14)— The LHCf collaboration —1) INFN Sezione di Firenze, Italy2) Universit`a degli Studi di Firenze, Florence, Italy3) IFAC CNR, Florence, Italy4) IFIC, Universitat de Val`encia, Valencia, Spain5) Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan6) Ecole-Polytechnique, Palaiseau Cedex, France7) RISE, Waseda University, Tokyo, Japan8) CERN, Gen`eve, Switzerland9) Department of Physics, Konan University, Kobe, Japan10) Institute of Physics, Kanagawa University, Yokohama, Japan11) Universit`a degli Studi di Catania, Catania, Italy12) INFN Sezione di Catania, Catania, Italy13) Accelerator and Fusion Research Division, LBNL, Berkeley, USA14) Faculty of System Engineering, Shibaura Institute of Technology, Saitama, Japan