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A search for dark matter particles directly produced in proton-protoncollisions recorded by the CMS experiment at the LHC is presented. The datacorrespond to an integrated luminosity of 18.8 inverse femtobarns, at acenter-of-mass energy of 8 TeV. The event selection requires at least two jetsand no isolated leptons. The razor variables are used to quantify thetransverse momentum balance in the jet momenta. The study is performedseparately for events with and without jets originating from b quarks. Theobserved yields are consistent with the expected backgrounds and, depending onthe nature of the production mechanism, dark matter production at the LHC isexcluded at 90% confidence level for a mediator mass scale Lambda below 1 TeV.The use of razor variables yields results that complement those previouslypublished.

Search for dark matter particles in proton-proton collisions at sqrt(s) = 8 TeV using the razor variables