The ATLAS discovery potential for a heavy charged Higgs boson in gg → tbH ± with H ± → tb Kétévi A. Assamagan and Nils Gollub Eur. Phys. J. C, 39 S2 (2005) 25-40 Published online: 18 August 2004 DOI: 10.1140/epjcd/s2004-01-009-7