  A search for new interactions and resonances produced in LHC proton-proton
(pp) collisions at a centre-of-mass energy sqrt(s)= 7 TeV has been performed
with the ATLAS detector. Using a data set with an integrated luminosity of 36
pb-1 dijet mass and angular distributions have been measured up to dijet masses
of \sim 3.5 TeV and found to be in good agreement with Standard Model
predictions. This analysis sets limits at 95% C.L. on various models for new
physics: an excited quark is excluded with mass between 0.60 and 2.64 TeV, an
axigluon hypothesis is excluded for axigluon masses between 0.60 and 2.10 TeV
and Randall-Meade quantum black holes are excluded in models with six extra
space-time dimensions for quantum gravity scales between 0.75 and 3.67 TeV.
Production cross section limits as a function of dijet mass are set using a
simplified Gaussian signal model to facilitate comparisons with other
hypotheses. Analysis of the dijet angular distribution using a novel technique
18 simultaneously employing the dijet mass excludes quark contact interactions
with a compositeness scale {\Lambda} below 9.5 TeV.
