  A search for the Standard Model Higgs boson decaying into a pair of tau
leptons is reported. The analysis is based on a data sample of proton-proton
collisions collected by the ATLAS experiment at the LHC and corresponding to an
integrated luminosity of 4.7 fb^-1. No significant excess over the expected
background is observed in the Higgs boson mass range of 100-150 GeV. The
observed (expected) upper limits on the cross section times the branching ratio
for H to tau+ tau- are found to be between 2.9 (3.4) and 11.7 (8.2) times the
Standard Model prediction for this mass range.
