  A search for resonances and quantum black holes is performed using the dijet
mass spectra measured in proton-proton collisions at sqrt(s) = 8 TeV with the
CMS detector at the LHC. The data set corresponds to an integrated luminosity
of 19.7 inverse femtobarns. In a search for narrow resonances that couple to
quark-quark, quark-gluon, or gluon-gluon pairs, model-independent upper limits,
at 95% confidence level, are obtained on the production cross section of
resonances, with masses above 1.2 TeV. When interpreted in the context of
specific models the limits exclude: string resonances with masses below 5.0
TeV; excited quarks below 3.5 TeV; scalar diquarks below 4.7 TeV; W' bosons
below 1.9 TeV or between 2.0 and 2.2 TeV; Z' bosons below 1.7 TeV; and
Randall-Sundrum gravitons below 1.6 TeV. A separate search is conducted for
narrow resonances that decay to final states including b quarks. The first
exclusion limit is set for excited b quarks, with a lower mass limit between
1.2 and 1.6 TeV depending on their decay properties. Searches are also carried
out for wide resonances, assuming for the first time width-to-mass ratios up to
30%, and for quantum black holes with a range of model parameters. The wide
resonance search excludes axigluons and colorons with mass below 3.6 TeV, and
color-octet scalars with mass below 2.5 TeV. Lower bounds between 5.0 and 6.3
TeV are set on the masses of quantum black holes.
