  An inclusive search for supersymmetric processes that produce final states
with jets and missing transverse energy is performed in pp collisions at a
centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated
luminosity of 11.7 inverse femtobarns collected by the CMS experiment at the
LHC. In this search, a dimensionless kinematic variable, AlphaT, is used to
discriminate between events with genuine and misreconstructed missing
transverse energy. The search is based on an examination of the number of
reconstructed jets per event, the scalar sum of transverse energies of these
jets, and the number of these jets identified as originating from bottom
quarks. No significant excess of events over the standard model expectation is
found. Exclusion limits are set in the parameter space of simplified models,
with a special emphasis on both compressed-spectrum scenarios and direct or
gluino-induced production of third-generation squarks. For the case of
gluino-mediated squark production, gluino masses up to 950-1125 GeV are
excluded depending on the assumed model. For the direct pair-production of
squarks, masses up to 450 GeV are excluded for a single light first- or
second-generation squark, increasing to 600\GeV for bottom squarks.
