  A search is presented for long-lived particles with a mass between 25 and 50
GeV$/c^2$ and a lifetime between 1 and 200 ps in a sample of proton-proton
collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV, corresponding to an
integrated luminosity of 0.62 fb$^{-1}$, collected by the LHCb detector. The
particles are assumed to be pair-produced by the decay of a Standard Model-like
Higgs boson. The experimental signature of the long-lived particle is a
displaced vertex with two associated jets. No excess above the background is
observed and limits are set on the production cross-section as a function of
the long-lived particle mass and lifetime.
