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An inclusive search is performed for supersymmetry in final states containingjets and an apparent imbalance in transverse momentum, pt[miss], due to theproduction of unobserved weakly interacting particles in pp collisions at acentre-of-mass energy of 8 TeV. The data, recorded with the CMS detector at theCERN LHC, correspond to an integrated luminosity of 18.5 inverse femtobarns.The dimensionless kinematic variable alpha[T] is used to discriminate betweenevents with genuine pt[miss] associated with unobserved particles and spuriousvalues of pt[miss] arising from jet energy mismeasurements. No excess of eventyields above the expected standard model backgrounds is observed. The resultsare interpreted in terms of constraints on the parameter space of severalsimplified models of supersymmetry that assume the pair production of topsquarks. The search provides sensitivity to a broad range of top squark decaymodes, including the two-body decay top squark to c chi0, where c is a charmquark and chi0 is the lightest neutralino, as well as the four-body decay topsquark to b f f' chi0, where b is a bottom quark and f and f' are fermionsproduced in the decay of an intermediate off-shell W boson. These modesdominate in scenarios in which the top squark and lightest neutralino arenearly degenerate in mass. For these modes, top squarks with masses as large as260 and 230 GeV are excluded, respectively, for the two- and four-body decays.

physics letters b

Search for top squark pair production in compressed-mass-spectrum  scenarios in proton-proton collisions at sqrt(s) = 8 TeV using the alpha[T]  variable