The ATLAS Experiment at the CERN Large Hadron Collider by Aad, G, Abat, E, Abdallah, J, Abdelalim, A, Abdesselam, A, Abdinov, O, Abi, B, Abolins, M, Abramowicz, H, Acerbi, E, Acharya, B, Achenbach, R, Ackers, M, Adams, D, Adamyan, F, Addy, T, Aderholz, M, Adorisio, C, Adragna, P, Aharrouche, M, Ahlen, S, Ahles, F, Ahmad, A, Ahmed, H, Aielli, G