This Letter presents the first search for supersymmetry in final states containing one isolated electron or
muon, jets, and missing transverse momentum from
√s = 7 TeV proton-proton collisions at the LHC.
The data were recorded by the ATLAS experiment during 2010 and correspond to a total integrated
luminosity of 35 pb^(-1). No excess above the standard model background expectation is observed. Limits
are set on the parameters of the minimal supergravity framework, extending previous limits. Within this
framework, for A_0 = GeV, tanβ = 3, and µ > 0 and for equal squark and gluino masses, gluino masses
below 700 GeV are excluded at 95% confidence level
