  Results are presented of a search for heavy particles decaying into two
photons. The analysis is based on a 19.7 inverse femtobarn sample of
proton-proton collisions at sqrt(s) = 8 TeV collected with the CMS detector at
the CERN LHC. The diphoton mass spectrum from 150 to 850 GeV is used to search
for an excess of events over the background. The search is extended to new
resonances with natural widths of up to 10% of the mass value. No evidence for
new particle production is observed and limits at 95% confidence level on the
production cross section times branching fraction to diphotons are determined.
These limits are interpreted in terms of two-Higgs-doublet model parameters.
