  A search for quark compositeness using dijet angular distributions from pp
collisions at sqrt(s) = 7 TeV is presented. The search has been carried out
using a data sample corresponding to an integrated luminosity of 2.2 inverse
femtobarns, recorded by the CMS experiment at the LHC. Normalized dijet angular
distributions have been measured for dijet invariant masses from 0.4 TeV to
above 3 TeV and compared with a variety of contact interaction models,
including those which take into account the effects of next-to-leading-order
QCD corrections. The data are found to be in agreement with the predictions of
perturbative QCD, and lower limits are obtained on the contact interaction
scale, ranging from 7.5 up to 14.5 TeV at 95% confidence level.
