  A search for supersymmetry or other new physics resulting in similar final
states is presented using a data sample of 4.73 inverse femtobarns of pp
collisions collected at sqrt(s)=7 TeV with the CMS detector at the LHC. Fully
hadronic final states are selected based on the variable MT2, an extension of
the transverse mass in events with two invisible particles. Two complementary
studies are performed. The first targets the region of parameter space with
medium to high squark and gluino masses, in which the signal can be separated
from the standard model backgrounds by a tight requirement on MT2. The second
is optimized to be sensitive to events with a light gluino and heavy squarks.
In this case, the MT2 requirement is relaxed, but a higher jet multiplicity and
at least one b-tagged jet are required. No significant excess of events over
the standard model expectations is observed. Exclusion limits are derived for
the parameter space of the constrained minimal supersymmetric extension of the
standard model, as well as on a variety of simplified model spectra.
