  Mass and angular distributions of dijets produced in LHC proton-proton
collisions at a centre-of-mass energy sqrt(s)=7 TeV have been studied with the
ATLAS detector using the full 2011 data set with an integrated luminosity of
4.8/fb. Dijet masses up to 4.0 TeV have been probed. No resonance-like features
have been observed in the dijet mass spectrum, and all angular distributions
are consistent with the predictions of QCD. Exclusion limits on six hypotheses
of new phenomena have been set at 95% CL in terms of mass or energy scale, as
appropriate. These hypotheses include excited quarks below 2.83 TeV, colour
octet scalars below 1.86 TeV, heavy W bosons below 1.68 TeV, string resonances
below 3.61 TeV, quantum black holes with six extra space-time dimensions for
quantum gravity scales below 4.11 TeV, and quark contact interactions below a
compositeness scale of 7.6 TeV in a destructive interference scenario.
