  A search for the pair production of new light bosons, each decaying into a
pair of muons, is performed with the CMS experiment at the LHC, using a dataset
corresponding to an integrated luminosity of 20.7 inverse femtobarns collected
in proton-proton collisions at center-of-mass energy of sqrt(s) = 8 TeV. No
excess is observed in the data relative to standard model background
expectation and a model independent upper limit on the product of the cross
section, branching fraction, and acceptance is derived. The results are
compared with two benchmark models, the first one in the context of the
next-to-minimal supersymmetric standard model, and the second one in scenarios
containing a hidden sector, including those predicting a nonnegligible light
boson lifetime.
