ATLAS discovery prospects for the charged Higgs in di-lepton ttbar events (H+ to taunu)

We present projections for the ATLAS sensitivity to a light charged Higgs boson in the channel H->taunu->lnu, present in models beyond the Standard Model, with an expected dataset corresponding to an integrated luminosity of 1fb-1 gathered at the ATLAS detector with the LHC running at 7 TeV. The results are based on re-scaling expectations from detailed analyses at 10 TeV using cross-section ratios.