Updated search for long-lived particles decaying to jet pairs

Abstract A search is presented for long-lived particles with a mass between 25 and 50 $$\,\mathrm{GeV}/c^{2}$$ GeV / c 2 and a lifetime between 2 and 500 ps, using proton–proton collision data corresponding to an integrated luminosity of 2.0 $$\,\mathrm{fb}^{-1}$$ fb - 1 , collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a 125 $$\,\mathrm{GeV}/c^{2}$$ GeV / c 2 Standard-Model-like Higgs boson. The experimental signature is a single long-lived particle, identified by a displaced vertex with two associated jets. No excess above background is observed and limits are set on the production cross-section as a function of the mass and lifetime of the long-lived particle.