Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at sqrt{s}=8 TeV

A search for new resonances decaying to WW, ZZ, or WZ is presented. Final
states are considered in which one of the vector bosons decays leptonically and
the other hadronically. Results are based on data corresponding to an
integrated luminosity of 19.7 inverse femtobarns recorded in proton-proton
collisions at sqrt(s) = 8 TeV with the CMS detector at the CERN LHC. Techniques
aiming at identifying jet substructures are used to analyze signal events in
which the hadronization products from the decay of highly boosted W or Z bosons
are contained within a single reconstructed jet. Upper limits on the production
of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass
and width. We increase the sensitivity of the analysis by statistically
combining the results of this search with a complementary study of the
all-hadronic final state. Upper limits at 95% confidence level are set on the
bulk graviton production cross section in the range from 700 to 10 femtobarns
for resonance masses between 600 and 2500 GeV, respectively. These limits on
the bulk graviton model are the most stringent to date in the diboson final
state.