A PRECISION EXPERIMENT ON ELECTRONS, PHOTONS AND MUONS AT LHC by Aziz, T, Bock, R, Braunschweig, W, Geulig, E, Hilgers, K, Hillemanns, H, Karpinski, W, Kornadt, O, Krenz, W, Lehmann, T, Lindemann, B, Lubelsmeyer, K, Nippe, A, Pandoulas, D, Pei, Y, Rohner, M, Schmitz, D, Schoentag, M, Schulz, A, Dratzig, V, Schwenke, J, Schwering, G, Siedling, R, Subhani, K, Toporowsky, M