  This Letter presents a search for the Standard Model Higgs boson in the decay
channel H->ZZ(*)->l+l-l'+l'-, where l,l'=e or mu, using proton-proton
collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector and
corresponding to an integrated luminosity of 4.8 fb^-1. The four-lepton mass
distribution is compared with Standard Model background expectations to derive
upper limits on the cross section of a Standard Model Higgs boson with a mass
between 110 GeV and 600 GeV. The mass ranges 134-156 GeV, 182-233 GeV, 256-265
GeV and 268-415 GeV are excluded at the 95% confidence level. The largest
upward deviations from the background-only hypothesis are observed for Higgs
boson masses of 125, 244 and 500 GeV with local significances of 2.1, 2.2 and
2.1 standard deviations, respectively. Once the look-elsewhere effect is
considered, none of these excesses are significant.
