A search is presented for narrow heavy resonances
X decaying into pairs of Higgs bosons (H) in protonproton
collisions collected by the CMS experiment at the
LHC at √s = 8 TeV. The data correspond to an integrated
luminosity of 19.7 fb−1. The search considers HH resonances
with masses between 1 and 3 TeV, having final states of two
b quark pairs. Each Higgs boson is produced with large
momentum, and the hadronization products of the pair of
b quarks can usually be reconstructed as single large jets.
The background from multijet and tt events is significantly
reduced by applying requirements related to the flavor of the
jet, its mass, and its substructure. The signal would be identi-
fied as a peak on top of the dijet invariant mass spectrum of the
remaining background events. No evidence is observed for
such a signal. Upper limits obtained at 95 % confidence level
for the product of the production cross section and branching
fraction σ (gg → X) B(X → HH → bbbb) range from 10
to 1.5 fb for the mass of X from 1.15 to 2.0 TeV, significantly
extending previous searches. For a warped extra dimension
theory with a mass scaleR = 1 TeV, the data exclude radion
scalar masses between 1.15 and 1.55 TeV.